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  • [00:00:34] * Topic is 'http://beagleboard.org/chat has a guide on how to ask questions and links to the logs | never ask to ask, just ask | be patient | pastebin a boot log | http://ahsoftware.de/Beaglebone_Black_Boot_explained.svg | http://beagleboard.org/latest-images | http://beagleboard.org/Support/bone101 | direct bonescript/node.js questions to #beagle-bonescript | books: http://bit.ly/bbb-books'
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  • [03:31:26] <zmatt> woot, directly accessing the ADC works
  • [03:32:11] <zmatt> (via /dev/mem)
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  • [03:33:33] <zmatt> now, time to hook that up to edma and see if the adc can really deliver 1.6 Msps
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  • [03:45:37] <GenTooMan> What ENOB are you shooting at err for?
  • [03:47:27] * zmatt stares at that sentence but keeps getting "parse error" as result
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  • [04:43:43] <zmatt> aaand then suddenly the adc's FSM got stuck o.O
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  • [05:02:33] <zmatt> at least running without a hitch so far at 200 Ksps...
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  • [05:02:43] <TurboBob> hello
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  • [05:03:56] <TurboBob> actually, I'll be back on in the morning. I tried to post in the forums on BeagleBoard.org, but it would not let me (I registered last year)
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  • [05:05:01] <TurboBob> looking for some PRU initialization expertise. I have everything working well, c compiler, prussdrv, uio_pruss. the issue is initializing R30 before the pins are mux'd
  • [05:05:36] * Er0x_ (~quassel@46.17.57.19) has joined #beagle
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  • [05:05:50] <TurboBob> there is no info coming out of TI other that one tiny mention in one document that says it should be done.
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  • [05:06:28] <zmatt> I don't have any experience with the tools, but iirc you can read/write the core registers when they are halted
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  • [05:07:40] <TurboBob> the documentation is somewhat sketchy about whether R30 is accessible from outside the PRU. it seems like its mapped to a debug register. so I am hacking in that general direction.
  • [05:08:20] <TurboBob> but it needs to happen before the pins are muxed, so that may mean in u-boot. which is tough to debug.... (for us mortals)
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  • [05:09:53] <zmatt> you can of course leave the pins initially muxed to gpio and change them to pru later on
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  • [05:10:34] <TurboBob> that was another idea. is there a cheat-sheet for poking the pinmux from the user application?
  • [05:10:59] <TurboBob> the TRM has all the info, but its pretty buried sometimes.
  • [05:11:44] <zmatt> well my jbang project ( https://github.com/dutchanddutch/jbang ) happens to poke at pinmux registers from userspace (though not to actually change pinmux, but it's easy enough to adapt)
  • [05:11:59] <TurboBob> worst case, I can load a PRU program that resets the pin states, then switch the pinmux. (this is backup-plan #2)
  • [05:12:45] <TurboBob> interesting project.
  • [05:12:48] <zmatt> you can find mux options by cross-referencing the TRM and datasheet, or more conveniently my spreadsheet -> https://docs.google.com/spreadsheets/d/1CK5c-Cs8G1RtzGo-J3VJsD9m5K-fp06AncgeYWsdjSU/view
  • [05:13:26] <zmatt> the "BBB" tab also has a filter view that shows just the pins accessible on the BBB (menu Data -> Filter views -> CAPE)
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  • [05:13:38] <TurboBob> the TI pinmux tool can create some of this info as well
  • [05:13:41] <zmatt> the BBB2 tab shows similar info
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  • [05:14:37] <TurboBob> it seems odd that this situation is not discussed commonly, especially considering the linuxCNC project and other PRU based things.
  • [05:15:25] <TurboBob> although the PRU seems to be considered black magic, and the TI tools are klunky at best.
  • [05:15:31] <zmatt> like I said, I haven't looked at the PRU tools yet
  • [05:15:40] <TurboBob> unfinished, undocumented, unsupported.....
  • [05:16:04] <zmatt> I'd normally expect them to be supposed to take care of such a thing, since pinmux is normally done after the peripheral is initialized
  • [05:16:20] <zmatt> and setting R30 would be part of that initialization
  • [05:16:28] <TurboBob> yeah, me too.
  • [05:16:49] <TurboBob> thus my surprise when there is nothing in the documentation.
  • [05:17:12] <TurboBob> its mentioned in PRUSS Software Mitigation Guide for AM335x
  • [05:17:57] <TurboBob> Note the R30 and R31 registers should be initialized before releasing the PRU from HALT. Also, to avoid driving uninitialized values on GP pins configured as OUTPUTs, the register write of this initialization must complete soon after reset, but before setting the SoC level Pin Mux to OUTPUT values from PRU""
  • [05:18:28] <zmatt> well, I'm not too impressed by the quality of TI's software
  • [05:18:42] <TurboBob> that is the ONLY mention from TI, and for that matter anyone else (beagleboard.org, E2E, etc.)
  • [05:18:48] * unbroken_ftw (~uuhimhere@1.9.98.142) has joined #beagle
  • [05:18:57] <TurboBob> other that this ONE post:
  • [05:19:25] <TurboBob> http://e2e.ti.com/support/arm/sitara_arm/f/791/p/379070/1335516
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  • [05:20:16] <TurboBob> one user comes up with a solution (I have not gotten it to work yet). TI replies with a virtual "whatever"
  • [05:20:55] <zmatt> hmm, ok with the ADC running at 800 Ksps (167 ns sample time) the inputs definitely need to be driven with lower impedance than 10 Kohm
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  • [05:22:19] <TurboBob> I have not found conclusive info on whether the device tree is loaded by u-boot, but initializing R30 within u-boot should do the job.
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  • [05:23:03] <zmatt> device tree is loaded into memory by u-boot, and some last minute patch-ups are done, but other than that u-boot doesn't interpret device tree afaik
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  • [05:23:50] <zmatt> initializing R30 within u-boot means you'll first have to take PRUSS out of reset though
  • [05:24:06] <TurboBob> relative to your ADC comment, we are seeing lots of jitter on our ADC reads, perhaps its related to the sample time, thats next weeks bug-chase.
  • [05:24:58] <TurboBob> yeah, thats what the user that posted on E2E did. I have not gotten it to work, but I am headed in that direction.
  • [05:25:23] <TurboBob> // PRU initialization code writel(0x2, 0x44e00c00); // PRU reset writel(0x0, 0x44e00c00); writel(0x2, 0x44e000e8); // PRU enable writel(0x2, 0x44e00c00); // PRU reset writel(0x0, 0x44e00c00); writel(0x0, 0x4a322478); // PRU0 r30 clear (output low) writel(0x0, 0x4a324478); // PRU1 r30 clear (output low)
  • [05:25:45] <TurboBob> not sure if there are <code> formatting tags on here
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  • [05:26:06] <zmatt> I'm seeing a fair bit of noise too, but I've only just gotten it to work and haven't looked much at it yet
  • [05:26:16] <TurboBob> when I compile that into u-boot the board hangs.
  • [05:26:54] <zmatt> I'm still a bit concerned with the fact that the ADC's FSM locked up once (requiring system reset), but I haven't been able to reproduce it
  • [05:27:25] <TurboBob> we are seeing +/- 5% on our ADC reads.
  • [05:27:37] <TurboBob> yeah, thats worrysome...
  • [05:27:51] <zmatt> I may have been doing something inappropriate though
  • [05:28:01] * koleto (~koleto@95.90.212.141) Quit (Client Quit)
  • [05:28:35] <zmatt> I now make sure I cleanly stop the ADC (disable all steps, wait for the FSM to go idle) before disabling it and changing any config
  • [05:29:36] <TurboBob> yeah, I have locked up the CAN controller by doing things out of order (I'm pretty sure I know what I did)
  • [05:30:07] <TurboBob> I feel very isolated from the hardware with this embedded linux stuff. I'd rather poke the registers myself....
  • [05:30:11] <zmatt> overall I'm happy I actually got the ADC working with EDMA, all from userspace
  • [05:30:30] <zmatt> oh I ditched the ADC kernel driver
  • [05:30:37] <TurboBob> thats pretty cool.
  • [05:31:13] <zmatt> fortunately the EDMA kernel driver always reserves the channel and 1 associated slot for each DMA declared in device tree, even if the peripheral is disabled
  • [05:31:14] <TurboBob> yeah we have a touchscreen, so the driver is combined. we don't have time to fix it right.
  • [05:31:55] <zmatt> I have all 8 channels on continuous sampling, with EDMA copying the data into a fixed buffer in ocmc ram
  • [05:32:12] <zmatt> so I can just read the buffer to get the latest data
  • [05:32:15] <zmatt> no irqs to deal with
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  • [05:32:45] <TurboBob> any filtering or averaging going on? I'm afraid I will have to resort to that to fix the noise.
  • [05:33:01] <zmatt> haven't tried the averaging function yet
  • [05:33:09] <zmatt> but presumably that will help
  • [05:33:51] <ds2> FSM of ADC stuck?
  • [05:34:14] <zmatt> ds2: yup, a permanent 0x20
  • [05:34:22] <zmatt> even when disabled in control register
  • [05:34:28] <TurboBob> the noise we are seeing is really strange, noise as bad as the ADC is reporting would be easily visible on my crummy o-scope. scope showed clean voltages.
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  • [05:35:35] <zmatt> TurboBob: I wonder whether the kernel driver configures the steps to use vref+/vref- as reference inputs or vss/vdd
  • [05:35:36] <ds2> zmatt: wow... never seen that before...
  • [05:35:51] <ds2> the ADC has absolutely horrible noise
  • [05:36:06] <zmatt> ds2: the weird thing is, I don't think I "did" anything when it occurred
  • [05:36:09] <ds2> w/o filtering, you're pressed to get 7 useable bits
  • [05:36:23] <zmatt> ds2: as in, it was running fine on EDMA
  • [05:36:40] <TurboBob> thats about what we have been seeing, +/- 5%
  • [05:36:46] <ds2> zmatt: oh you are DMA'ing too? is that done by the latest driver?
  • [05:36:47] <zmatt> I hooked up a wire to channel 0 (but hadn't connected the other end yet to anything)
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  • [05:37:02] <ds2> TurboBob: what is the analog range of your signal?
  • [05:37:10] <zmatt> ds2: read up, about 7 minutes ago :)
  • [05:37:48] <TurboBob> the raw/real-world range depends on teh channel. we are keeping it within the 1.8v at the chip
  • [05:38:32] * pehjota (~pehjota@24.229.5.115) Quit (Ping timeout: 265 seconds)
  • [05:38:36] <zmatt> ds2: anyhow, I polled the buffer again, but got no edma completion bit set after that, so I tried to reinitialize the adc, but no go.. FSM remained stuck at the first step
  • [05:38:46] <ds2> zmatt: the jbang project?
  • [05:39:06] <zmatt> ds2: <zmatt> overall I'm happy I actually got the ADC working with EDMA, all from userspace <zmatt> oh I ditched the ADC kernel driver
  • [05:39:53] <ds2> zmatt: oh that... I have a mod'ed kernel driver... I have seen an odd case (always start up) where I get no IRQ's
  • [05:40:31] <ds2> TurboBob: try keeping it in the 0.9V range... for some reason if I limit my signals to 0.9V, it comes out cleaner as if it is stuck in some pseudo diff mode
  • [05:40:43] <zmatt> ds2: a thought that occurred to me is the possibility that when I connected the wire I introduced some ESD and glitched up the peripheral
  • [05:40:55] <zmatt> but it doesn't seem very likely to me
  • [05:41:19] <ds2> zmatt: have you verified there is no funny EDMA side effect with user space?
  • [05:41:49] <TurboBob> well, the hardware is "done" so I will have to live with it.... (fix it with software)
  • [05:41:59] <zmatt> ds2: shouldn't be... the kernel driver is used to EDMA being used by "third parties" as well, and I'm only using resources which it has reserved for the adc anyway
  • [05:42:00] <ds2> the low ADC channels supposely have some errata relating to charge leakage from the TSC options even though TSC is not used
  • [05:42:44] <TurboBob> the adc is "world"-----------<22k>-----+-------<adc>
  • [05:43:01] <zmatt> 22k... that's rather high impedance
  • [05:43:02] <TurboBob> ------12k------GND
  • [05:43:24] <TurboBob> with a .1uf at the input
  • [05:43:43] <ds2> zmatt: I really wonder if your EDMA problem is related to my occasional lack of interrupt
  • [05:43:59] <TurboBob> didn't want to load down the signal source, no room for an op-amp buffer.
  • [05:44:02] <zmatt> ds2: well it definitely wasn't EDMA... the ADC itself was stuck hard
  • [05:44:18] <ds2> zmatt: using the reset bit fixes it?
  • [05:44:19] <zmatt> TurboBob: maybe put a cap on the adc-side?
  • [05:44:27] <TurboBob> .1uf is there
  • [05:44:32] <ds2> TurboBob: what data rate do you need?
  • [05:44:33] <zmatt> ds2: examine its sysconfig register, find it has none
  • [05:44:47] <TurboBob> s.l.o.w.
  • [05:44:56] <ds2> averaging REALLY helps
  • [05:45:01] <TurboBob> and we do have a TSC
  • [05:45:22] <TurboBob> yeah, going to spin a thread at .5khz and do a bunch averaging.
  • [05:45:26] <ds2> TurboBob: what channel are you using?
  • [05:45:42] <TurboBob> all the ones the TSC will let us use......
  • [05:46:07] <zmatt> ds2: I don't understand why the kernel driver doesn't use DMA though.... the ADC even has a separate data port on the L3 for that purpose
  • [05:46:57] <TurboBob> here is teh device tree for the TSC/ADC
  • [05:47:00] <TurboBob> tscadc { compatible = "ti,am3359-tscadc"; reg = <0x44e0d000 0x1000>; interrupt-parent = <&intc>; interrupts = <16>; ti,hwmods = "adc_tsc"; status = "okay"; tsc { compatible = "ti,am3359-tsc"; ti,wires = <4>; ti,x-plate-resistance = <200>; ti,coordinate-readouts = <5>; ti,wire-config = <0x00 0x11 0x22 0x33>; }; adc { compatible = "ti,am3359-adc"; ti,adc-channels = <4 5 6
  • [05:47:23] <TurboBob> I guess that means we are using channels 4-7
  • [05:47:39] <ds2> zmatt: someone needing to write it? and manage it between 2 drivers?
  • [05:47:53] <ds2> TurboBob: what channel is it wired to?
  • [05:47:57] <TurboBob> (I didn't configure that part of this, I'm just the guy that has to fix it)
  • [05:48:09] <ds2> this is a SW thing
  • [05:48:20] <zmatt> ds2: yeah, plus the kernel EDMA driver doesn't look very appealing either
  • [05:48:46] <ds2> zmatt: yeah... didn't have time to fix it myself
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  • [05:50:00] <ds2> zmatt: i wonder if there is a reset in the PRCM block (still reading TRM)
  • [05:50:12] <zmatt> I just realized this is also the first time I'm actually using my edma header, rather than just using it as a repository for my notes on edma
  • [05:50:26] <zmatt> and apparently I didn't screw it up \o/
  • [05:50:44] <zmatt> ds2: prcm has none
  • [05:50:54] <zmatt> you can try the target agent's reset bit
  • [05:51:14] <TurboBob> the analogs are connected to AIN4 - AIN7
  • [05:51:14] <zmatt> but the one time I tried that it turned out it wasn't connected to the peripheral
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  • [05:52:58] <zmatt> (you can find docs on the target agents in the interconnect chapter of course... ha ha right except there's nothing there for the am335x, but see the interconnect chapter of the dm814x for example, or an omap4)
  • [05:53:42] <ds2> damn it... i am used tothe full blown PRCM
  • [05:54:12] <zmatt> am335x's PRCM looks like whoeever did its layout was drunk
  • [05:54:25] <ds2> you are so kind
  • [05:55:34] <zmatt> I was used to the dm814x
  • [05:55:56] <zmatt> I'm still traumatized from subsequently examining the am335x prcm
  • [05:57:15] <zmatt> like, *everything* about it is inconsistent, both internally and with the generic layout found on other omap4/5-generation SoCs
  • [05:57:27] <zmatt> the reset control bits don't even line up with their fucking status bits
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  • [06:00:28] <zmatt> but peripherals normally don't have an individual reset in PRCM, only big subsystems
  • [06:00:29] <bwarff> if you really want trauma, install winCE on the beagle like i just did
  • [06:00:34] <zmatt> lol
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  • [06:01:14] <bwarff> i do suspect some drinking was involved in the beagle, 0xBABE7175 in the pru for instance :)
  • [06:01:16] <zmatt> ds2: however I really don't understand why there's no reset bit in its sysconfig like any normal peripheral has
  • [06:01:44] <zmatt> the am335x looks to me like it was done rather in a hurry or something
  • [06:02:51] <zmatt> it also has a ton of ghost modules... where they backspaced some peripheral but not its clkctrl register or target agent
  • [06:04:23] <ds2> zmatt: maybe it is undocumented/broken?
  • [06:05:11] <zmatt> I'm fairly certain the am335x doesn't have PCIe
  • [06:05:22] <zmatt> also given that all pins are accounted for
  • [06:05:33] <ds2> you decapped it and verified?
  • [06:05:44] <ds2> maybe it does but the pins are not bonded out
  • [06:06:12] <zmatt> except the am335x (for whatever reason) has padconf registers for literally _everything_
  • [06:06:42] <tbr> sounds like unchecked copy-paste from $somewhere
  • [06:06:45] <zmatt> even the power-on reset pin has one
  • [06:06:49] <zmatt> yes, centaurus
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  • [06:06:59] <zmatt> subarctic is very clearly centaurus-derived
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  • [06:07:30] <zmatt> (except for the prcm)
  • [06:07:39] <ds2> with the investment to do a chip, it could be there are 3-4 different chips that share the same die but with minor tweaks
  • [06:08:07] <zmatt> sure, subarctic is not just am335x but also dra61x / dra60x (one or both, not sure)
  • [06:08:10] <TurboBob> i'm headed off to bed, I'm going to leave this 'puter logged in to IRC, I'll read it all in the AM (well, later in the AM)
  • [06:08:31] <zmatt> that's why there's MLB and such
  • [06:08:46] <ds2> MLB? Major League Baseball?
  • [06:08:53] <zmatt> media local bus
  • [06:09:13] <ds2> zmatt: decap it and make pictures of each of the chips to confirm
  • [06:09:48] <zmatt> I actually don't *entirely* exclude the possibility the PCIe subsystem might actually be there
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  • [06:10:47] <zmatt> since it has a clkctrl, target agent, L3 firewall, and even the registers of the PCIe APLL are present in the control module (but don't respond to writes)
  • [06:11:03] <ds2> is the jbang project that contains the EDMA code?
  • [06:11:18] <zmatt> there's no edma code in jbang
  • [06:11:26] <ds2> oh
  • [06:11:35] <ds2> is your edma/adc code somewhere?
  • [06:11:40] <zmatt> yes, my hd
  • [06:11:46] <ds2> oh ok n/m
  • [06:12:30] <zmatt> I don't exclude the possibility I may eventually release it as example, but that would also need to be OK'd by my employer :)
  • [06:12:49] <ds2> *nod*
  • [06:13:08] <ds2> the other question would be - is it a GPLv2 compatible license (for kernel)
  • [06:13:27] <zmatt> you'll never get any of my code accepted in the kernel
  • [06:13:42] <zmatt> it's C++14
  • [06:14:08] <zmatt> (see the jbang project, it is representative of my current code style)
  • [06:14:19] <ds2> it isn't the coding style
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  • [06:14:56] <ds2> was looking for a working register setting for using EDMA on the ADC and the PRU
  • [06:15:19] <ds2> TRM every now and then has intersting surprises
  • [06:15:40] <zmatt> the ADC is very straightforward for DMA
  • [06:15:50] <zmatt> you just configure a DMA threshold on a FIFO and enable its DMA bit
  • [06:15:58] <ds2> it works exactly as described w/o quirks?
  • [06:16:05] <zmatt> afaict
  • [06:16:45] <ds2> sounds just like the interrupt mode
  • [06:17:49] <zmatt> yup, only difference is that the signal goes to edma (and is pulsed rather than level)
  • [06:18:49] <zmatt> I've configured the threshold equal to the number of steps, and edma with a really simple static job that slurps the fifo in one burst and spits it onto a fixed buffer
  • [06:23:44] <zmatt> in general, I've found the adc to be really simple to configure
  • [06:25:26] <zmatt> but peripherals can definitely hide "entertaining" surprises now and then
  • [06:26:12] <zmatt> like I discovered the hard way that the uart's FIFO is incapable of accepting data at the rate the L4 interconnect can deliver it
  • [06:27:12] <ds2> there are many interesting surprises
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  • [06:27:33] <mrtexasfreedom> Just taking an informal poll---- what OS is everyone running on their BBB?
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  • [06:28:31] <zmatt> ds2: the i2c controller is fun too
  • [06:29:02] <ds2> personal favorite is the McSPI
  • [06:29:13] <zmatt> mcspi seemed relatively sane so far
  • [06:29:22] <zmatt> but I haven't really played with it yet
  • [06:29:31] <ds2> until you try to use something more then basic features
  • [06:29:34] <zmatt> i2c otoh is broken as shit
  • [06:30:09] <zmatt> my advice to anyone using the i2c controller would be to keep it in reset until you need to perform a transaction, and put it back in reset afterwards
  • [06:30:16] <zmatt> (and forget about multimaster)
  • [06:30:32] <ds2> single master i2c seems to work okay
  • [06:30:56] <zmatt> if you look at the linux driver, you'll find that it actually resets the controller if it encounters any error
  • [06:31:14] <zmatt> getting a nack from a slave will lock up the FSM already
  • [06:31:35] <ds2> i have enough problem elsewhere that I don't peak inside another driver unless needed :D
  • [06:31:39] <zmatt> hehe
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  • [06:32:20] <ds2> i like system to do what I need
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  • [06:32:45] <zmatt> a single pulse low on SDA will also lock up the i2c controller... you won't see anything in its status regs, bus-busy will be cleared, but if you try to start a transaction simply nothing happens
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  • [06:33:00] <zmatt> the start bit remains set, the FSM continues to pick its nose
  • [06:33:36] <ds2> I been hot swapping the I2C lines and it seems fine
  • [06:34:11] <mrtexasfreedom> Has anyone here mounted an lvm2 pv volume in debian?
  • [06:34:23] <zmatt> yeah a mere glitch shouldn't cause it, there's still the input filter
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  • [06:34:39] <zmatt> I meant a pulse long enough to qualify as a start condition
  • [06:35:02] <ds2> maybe it is the reset you are pointing out but I have seen it recovery just fine from a poorly behaving slave (in this case, a MCU stopped in the middle of a xfer)
  • [06:35:28] <zmatt> if it times out - reset, if it gets a NAK - reset
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  • [06:36:27] <ds2> besides, it can't be worse then musb
  • [06:36:28] <ds2> ;)
  • [06:36:51] <zmatt> musb looks.... interesting
  • [06:37:29] <zmatt> I've never seen so many test, diagnostic, tweak, tune, twiddle registers in one peripheral
  • [06:37:46] <zmatt> really makes me feel they have a lot of confidence in that thing
  • [06:38:37] <ds2> hehehe
  • [06:39:16] <zmatt> it actually took a moment before I realized a big list of registers in the TRM doesn't include the actual usb core
  • [06:39:16] <tbr> the test modes you can even use to bitbang usb...
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  • [06:39:28] <zmatt> it's just dma, phy, and integration stuff
  • [06:39:52] <zmatt> tbr: I'd still consider that moderately normal
  • [06:40:13] <tbr> why would you do such a thing? because Nokia hardwired the bus for device operations on the N900, while it was capable of host and people wanted to use host, but the FSM would reset if you tried to put it in host mode.
  • [06:40:23] <zmatt> but a "Disable the VBUS debouncer circuit fix" bit otoh....
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  • [06:42:37] <zmatt> "Flags if the RX data packet has PID error. NOT IMPLEMENTED YET"
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  • [06:45:40] <tbr> everybody loves musb...
  • [06:46:50] <zmatt> <3
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  • [06:48:29] <zmatt> to be fair, a big part of the problem is of course USB itself
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  • [07:17:46] <zmatt> ok, u-boot's mass-storage gadget is definitely a _lot_ slower than the kernel's
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  • [08:18:32] <laborant78> Greetings. How can I erase emmc on BBB?
  • [08:18:57] <av500> for what purpose?
  • [08:19:08] <tbr> you could boot from µSD and then dd /dev/zero over the emmc device
  • [08:19:23] <tbr> but it wouldn't /really/ erase everything
  • [08:19:28] <tbr> due to wear levelling etc
  • [08:19:48] <tbr> would need "nation state capabilities" to recover it though ;)
  • [08:20:26] <laborant78> Is anyway to erase everything?
  • [08:21:02] <tbr> what is your specific reason you want to do that though?
  • [08:21:13] <tbr> that migth help to point you towards the right thing
  • [08:21:57] <laborant78> Well I don't like that latest debian flashed on emmc, I want to downgrade to Ubuntu
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  • [08:22:24] <laborant78> But don't want to hold boot button all the time as well :)
  • [08:22:26] <av500> so install Ubuntu
  • [08:22:31] <av500> no need to erase emms
  • [08:22:41] <av500> then all you need to delete is MLO
  • [08:22:43] <av500> on the emmc
  • [08:22:50] <laborant78> how?
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  • [08:25:14] <av500> either boot into debian
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  • [08:25:30] <av500> or boot from sd and mount the emmc fat partition
  • [08:25:31] <av500> and dlete it
  • [08:27:02] <laborant78> Ok so I need to ssh to debian, mount 90 Mb FAT16 partition and delete content if it, right?
  • [08:27:29] <av500> yes
  • [08:27:31] <av500> MLO should be enough
  • [08:27:34] <laborant78> Ok Isee
  • [08:27:48] <laborant78> And last question if you don't mind
  • [08:28:30] <av500> ask, dont ask to ask
  • [08:28:56] <laborant78> Can I install additional software to emmc flashed OR I need to build it SD first?
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  • [08:30:33] <laborant78> Why I'm asking this: I've installed Synaptic and GParted for LXDE, Neither of them launches.
  • [08:34:48] <tbr> you installed them using apt-get?
  • [08:35:24] <laborant78> sure
  • [08:35:40] <laborant78> using sudo
  • [08:35:56] <tbr> then they should work. if they don't, usual linux trouble-shooting applies.
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  • [08:40:25] <laborant78> ok will play around Ubuntu now. Thanks for advising
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  • [09:34:21] <michaelgobbers> Hi All. I’m trying to build kernel 3.14 for android. Anyone knows which config option I should enable for USB Host support?
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  • [09:50:16] <uuhimhere> michaelgobbers, dont do it android's da devil
  • [09:50:52] <michaelgobbers> why???
  • [09:51:14] <michaelgobbers> It’s a requirement for my project so no way around it.
  • [09:52:08] <tbr> don't feed the troll
  • [09:52:50] <uuhimhere> what troll?
  • [09:53:21] <tbr> michaelgobbers: you'll need several of those, but if there's a defconfig for bbb it should have it enabled
  • [09:53:42] <tbr> michaelgobbers: also make sure you have the android patches applied in that tree
  • [09:54:14] <michaelgobbers> there is one. However, it seems that the kernel upgrade that I’m did stopped it from working
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  • [09:54:52] <tbr> any particular reason you're not using whatever TI is using for their android thing on BBB/Sitara?
  • [09:55:14] * libregeekingkid (~quassel@116.75.34.25) Quit (Ping timeout: 246 seconds)
  • [09:55:16] <michaelgobbers> I started with the BBBAndroid project
  • [09:55:45] <michaelgobbers> I think this build alows you to actually access the GPIO pins
  • [09:56:05] <michaelgobbers> not sure if the build you are refering to is doing that
  • [09:56:45] <tbr> I have no idea about android on bbb. my advice is generic
  • [09:56:56] <uuhimhere> michaelgobbers, ignore the troll
  • [09:58:02] <michaelgobbers> hmm ok. Could you provide me with a link to the TI projects?
  • [09:58:41] <tbr> I'd be googling myself now. I remember seeing that they had their usual butchered releases somewhere.
  • [09:59:34] * ChanServ sets mode +o KotH
  • [09:59:42] <tbr> http://processors.wiki.ti.com/index.php/TI-Android-JB-4.2.2-DevKit-4.1.1_DeveloperGuide
  • [09:59:51] <michaelgobbers> yeah that 4.2
  • [09:59:52] * uuhimhere was kicked from #beagle by KotH
  • [09:59:54] <michaelgobbers> I need 4.4
  • [09:59:59] * KotH sets mode -o KotH
  • [10:00:01] <tbr> ha, good luck with that
  • [10:00:03] <michaelgobbers> that probably the reason :)
  • [10:00:14] <michaelgobbers> Thanks anyway
  • [10:00:58] <tbr> not sure what to suggest. if rowboat or something else is still around, maybe that.
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  • [10:02:20] <woglinde> I would guess no real android drivers for 4.4?
  • [10:02:29] <woglinde> at least for display
  • [10:03:10] <tbr> looking at google for "ti bbb android kitkat" there seem to be a few things. Might be missing the graphics acceleration though?
  • [10:03:46] <tbr> that one even claims sgx working: http://www.2net.co.uk/tutorial/android-4.4-beaglebone-update
  • [10:04:23] <tbr> he's using the ancient 3.2 kernel though
  • [10:04:35] <michaelgobbers> The BBBAndroid project is working somewhat. but it was missing bluetooth le. I tried adding it but to support the le mode I had to upgrade the kernel.
  • [10:05:16] <michaelgobbers> so 3.2 kernel isn’t sufficient
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  • [10:08:25] <zmatt> lol, some coworkers testing new hardware... but I suspect it still has some minor issues
  • [10:08:44] <zmatt> judging by the loud bang after power-on and the plume of smoke that rose from the PCB
  • [10:09:02] <KotH> heh
  • [10:09:07] <KotH> +1 for magic smoke
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  • [10:11:12] <tbr> zmatt: sell them magic-smomke-refill packs
  • [10:11:47] <tbr> ble/smart will be tricky under android in general
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  • [10:20:38] <michaelgobbers> Yeah it is tricky… I had to replace the bluedroid stack in android with the bluez stack already.
  • [10:24:46] <woglinde> michaelgobbers hm looks like you need to patch the kernel stuff on rowboat for 3.14
  • [10:24:58] <woglinde> but I personal believe it will not work in the end
  • [10:25:08] <woglinde> because of the binaries
  • [10:26:48] <michaelgobbers> hmm Ill take a look at it
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  • [13:12:34] <bencollier> Hi all
  • [13:12:59] <bencollier> Just loading an 8GB SD with the latest Ubuntu 14.04 image for the first time.
  • [13:13:13] <bencollier> How long should I expect to wait on the Beagleboard XM for the device to start?
  • [13:13:37] <bencollier> Some instructions online suggest that it could take 5 mins to start
  • [13:13:52] <bencollier> But it's taken longer, almost 10 so far.
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  • [13:14:30] <bencollier> The SD light is flashing in a particular pattern rather than the sort of random flash I would expect from disk writes / reads.
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  • [13:15:26] <bencollier> But something is going on, as the screen times out but turns itself back on if I hit a cursor key.
  • [13:15:59] <bencollier> Any help would be extremely gratefully received.
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  • [13:43:04] <yegorich> Hi! Can one assign multiple triggers to one LED?
  • [13:43:50] <woglinde> yegorich does this make sense?
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  • [13:44:17] <woglinde> what happens when both events at the same time?
  • [13:44:27] <woglinde> how usefull is the output?
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  • [13:46:43] <yegorich> woglinde: I have a CAN controller and socketcan exports "can0-tx" and "can0-rx", but I only have one LED, that shows date being transmitted/recevied
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  • [13:46:58] <zmatt> interesting, flashing exactly the same image using BBBlfs to two fresh bbbs that happened to differ in the eMMC part used...
  • [13:47:03] <zmatt> kingston: 1572864000 bytes (1.6 GB) copied, 236.263 s, 6.7 MB/s
  • [13:47:13] <zmatt> micron: 1572864000 bytes (1.6 GB) copied, 607.657 s, 2.6 MB/s
  • [13:47:27] <yegorich> woglinde: we always have two LEDs: red - for error, green - for data
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  • [13:49:21] <woglinde> zmatt welcome to the world auf mmc
  • [13:52:02] <zmatt> woglinde: I'm surprised that both parts seem to be used pretty much at random, as if there's little difference
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  • [13:53:07] <zmatt> (both numbers are much less than the spec claims you should be able to achieve though)
  • [13:53:22] <woglinde> hahahahahaha specs
  • [13:53:29] <woglinde> and mmc/sd
  • [13:53:30] <woglinde> lol
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  • [13:53:55] <zmatt> well I did manage to them, with some effort (both marked "confidential")
  • [13:54:01] <zmatt> *to find them
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  • [13:55:16] <zmatt> micron claims seq write >= 6.6 MB/s, kingston claims seq write >= 12 MB/s
  • [13:56:27] <zmatt> (there are more differences, kingston is eMMC v4.51 vs micron v4.41, kingston has larger boot partitions (2 MB instead of 1 MB) but smaller user partition (3688 MB instead of 3744 MB)
  • [13:57:11] <johnwalkr> intersting!
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  • [14:00:51] <zmatt> micron specs 90 iops for random write, kingston doesn't spec random access performance
  • [14:01:45] <zmatt> (i.e. small writes will demolish performance, but that's not really news)
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  • [14:15:42] <Amjad> We need to buy Beaglebone and Beaglebone black
  • [14:15:51] <Amjad> How Long it taskes to deliver to uae
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  • [14:17:23] <woglinde> Amjad ask your distributor?
  • [14:18:02] <woglinde> actually I know nobody here, who is selling the boards directly
  • [14:19:53] <woglinde> I use actually again
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  • [14:47:03] <sri_> hi
  • [14:47:45] <sri_> I am unable to see the changes made in .config when i flash it using tftp
  • [14:48:08] <sri_> please can some one help me with this?
  • [14:49:38] <av500> flash? tftp?
  • [14:49:50] <sri_> yes
  • [14:50:14] <woglinde> configure your kernel to provide config.gz via /proc
  • [14:51:28] <sri_> git clone git://github.com/beagleboard/kernel.git cd kernel git checkout 3.12 ./patch.sh cp configs/beaglebone kernel/arch/arm/configs/beaglebone_defconfig wget http://arago-project.org/git/projects/?p=am33x-cm3.git\;a=blob_plain\;f=bin/am335x-pm-firmware.bin\;hb=HEAD -O kernel/firmware/am335x-pm-firmware.bin cd kernel make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- beaglebone_defconfig -j4 make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi-
  • [14:51:28] * divine (~divine@2001:470:8247:1::30) Quit (Ping timeout: 272 seconds)
  • [14:51:48] <sri_> I have followed above mentioned process
  • [14:52:04] <sri_> http://wiki.beyondlogic.org/index.php?title=BeagleBoneBlack_Building_Kernel
  • [14:52:14] <sri_> this is the link
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  • [14:52:25] <sri_> i want to enable a driver module
  • [14:53:36] <sri_> I made the changes and flashed the image as mentioned in the link
  • [14:53:56] <sri_> but I am unable to see any debug messaged from my kernel module
  • [14:54:06] <sri_> i dont even think its installed
  • [14:57:25] <sri_> I am struggling with the same since a week
  • [14:57:27] <sri_> :(
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  • [15:02:49] <woglinde> than install the modul
  • [15:03:19] <woglinde> flashing only the kernel image will not install any modules
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  • [15:54:13] <endoped> Okay, so I have a distributed network of display screens (could be lcd or 7-seg). It's all connected by cat5, with spans <= 300 ft. Data is controlled by a centralized bbb. Do you all think that the easiest solution is to just network it all and communicate via tcp/ip stack to a pic18 (or similiar) controlling a display screen? Or is there something I'm missing using the rs485 standard?
  • [15:56:13] <av500> why tcp/ip?
  • [15:56:22] <av500> just make a very simple serial protocol
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  • [16:02:18] <endoped> I guess my thinking is that the distances of the lines would be an issue, needing line drivers and termination...and using a switch would handle all of that (I'm not being paid very much for this, so I'm more interested in saving me time).
  • [16:03:30] <endoped> As it's not really an area I'm too familiar with, can I ask...why not tcp/ip?
  • [16:05:21] <av500> well, if you want to save time, just use ethernet
  • [16:05:29] <av500> and a PC at each end
  • [16:05:30] <av500> solved
  • [16:05:36] <av500> or a BBB at each nide
  • [16:05:37] <av500> node
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  • [16:13:14] <endoped> that's exactley what i was thinking. I like the pic18 option as it would be cheaper than additional bbbs. Ideally, I'd like to keep the switch under $200 and the display module at each node under $30...hence the pic18, an ethernet port, and a cheap lcd.
  • [16:16:06] * zacts (~zacts@freebsd/geek/zacts) has joined #beagle
  • [16:16:30] <dmelani> endoped: just go with tcp/ip. i've done something very similar before and it worked just fine
  • [16:17:03] <KotH> endoped: calculate price vs work time
  • [16:17:09] <dmelani> still does, actually
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  • [16:22:13] <zacts> hello, I'm chatting for the first time from my beaglebone black \o/
  • [16:23:09] <ASEV> hi
  • [16:23:49] <endoped> dmelani: thank you, I like confirmation of what I'm considering. KotH: yeah, that's probably a good idea. It may not be worth it, time-wise, to build my own boards out of cheaper parts.
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  • [16:34:57] <dmelani> fg
  • [16:35:05] <dmelani> bah. wrong terminal
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  • [19:01:10] <TurboBob> <zmatt> got the u-boot fix to init the R30's working. the lines in that E2E post worked except that it locks up unless there is a printf in the middle. perhaps compiler optimization or something.
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  • [20:23:46] <usm> hello
  • [20:24:11] <usm> Where do I get external LED's for beagle?
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  • [20:25:40] <Xack> usm: not sure but (sorry to be that guy) Google it hehe
  • [20:25:40] <clockman> Is it possible to disable the internal pullups on the I2C pins on the BBB?
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  • [20:26:14] <Xack> and also randomly PMing people isn't usually welcome :P
  • [20:26:39] <alyyousuf7> Can anyone answer a question related to eQEP's maximum speed?
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  • [20:30:17] <alyyousuf7> Can anyone answer a question related to eQEP's maximum speed?
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  • [22:27:59] <GenTooMan> <KotH> The Art of electronics is similar to Halbleiter-Schaltungstechnik (German Edition) you mentioned for jamesaxl yesterday (well save it is in English instead of German) Reminds me of the discussion on Quantum electronics I had 3 days ago (ahem). Anyhow I see your point about RTL in any case. Getting a YACC lex based parser working for VHDL is a bit of a pain because of VHDL ADA inheritance as the array operator is the
  • [22:27:59] <GenTooMan> same as the function and expression closure operator (duh). I ramble,
  • [22:29:00] <jamesaxl> GenTooMan: could you send it to me ?
  • [22:30:04] <GenTooMan> This is what I am refering too (http://www.amazon.com/Art-Electronics-Paul-Horowitz/dp/0521809266/ref=sr_1_1?s=books&ie=UTF8&qid=1426199370&sr=1-1&keywords=The+art+of+electronics) both are good books.
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  • [22:31:04] <GenTooMan> He is write in that likely the english translation for the book he mentioned isn't that great (it's a tradition to make good books harder to understand when translated I swear)
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  • [22:32:59] <jamesaxl> GenTooMan: bcs i have not found it , i torrent files
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  • [22:34:30] <GenTooMan> <jamesaxl> buy it it's worth every cent of it, some of the books I have are 80 years old and they are STILL good. It's an investment, besides you want a physical book, or you will have a very difficult time with it.
  • [22:35:24] <jamesaxl> GenTooMan: i want to buy it, my country does not allow Amazon, i should move to France to o that
  • [22:36:20] <GenTooMan> <jamesaxl> ahh see if your local book chains can get it for you? ISBN-13: 978-0521809269
  • [22:37:04] <GenTooMan> <jamesaxl> Has KotH suggested if you can learn german a lot of very good technical books are written in it.
  • [22:37:11] <jamesaxl> GenTooMan: i am going to try anyway
  • [22:37:56] <GenTooMan> <jamesaxl> Nothing worth while is easy, just remember that :D
  • [22:38:30] <jamesaxl> GenTooMan: of coorse and i can spend a lot of money for scince
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  • [22:46:38] <GenTooMan> well in the US most people do not know how to learn, learn to learn which is done by reading then listening then understanding
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  • [22:48:53] <woglinde> GenTooMan and trying
  • [22:55:11] <GenTooMan> Doing anything is better than 1:10 people doing something useful is better than 1:100 doing something great puts you as 1:10000 however you have to start by doing something :D
  • [22:56:33] <jamesaxl> GenTooMan: Lean to learn and teach
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  • [23:41:50] <jprimeau> Hi. I'm trying to flash a custom image on the eMMC of the BBB by following the steps in the Sitara Linux Program the eMMC on Beaglebone Black page. The page is not clear as what the AM335x is trying to do when booting from usb (holding the user button with no sd card inserted). I understand everything as soon as u-boot gets involved. But what does the bootloader in the AM335x's ROM exactly? Does it try to
  • [23:41:56] <jprimeau> get the SPL+u-boot from tftp via dhcp? BTW, I'm on Fedora 21 (and the guide suggest ubuntu 12.04LTS for setting up dhcp/tftp).
  • [23:43:59] <jprimeau> Oh and I hook up my FTDI cable and monitoring on the UART0... there is not much going on aside from outputting CCCC...
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  • [23:53:06] <jprimeau> Hmmm 26.1.8 in TRM...
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