**** BEGIN LOGGING AT Sun Mar 17 02:59:57 2019 Mar 17 11:14:47 Can anyone tell me what the effective max speed of the microSD slot is on the BB Black (v1)? Mar 17 11:15:05 "(v1)" ? Mar 17 11:16:54 maximum peak sd card transfer speed for the AM335x SoC is 24000000 bytes/s, some of which is overhead like CRCs Mar 17 11:17:07 so around 22 MB/s effectively Mar 17 11:19:30 for eMMC the max theoretical speed is twice that (same 48 MHz clock frequency, but eMMC has an 8-bit wide data bus instead of SD's 4-bit), although the actual max speed (especially for writes) of the eMMC may be much lower than that, same goes for SD cards. in both cases that would depend heavily on which exact eMMC part / SD card you have Mar 17 11:42:07 ... you're welcome? Mar 17 11:42:14 * zmatt pokes dabbler Mar 17 12:28:12 Have BeagleBone Blue running Debian 9.8, setup as AP. The connection from laptop to Beagle is very unstable, comes and goes. Anyone have experience in tracking down such issue? Mar 17 12:28:28 Connecting through USB is stable though :) Mar 17 12:30:48 zmatt, Should I notify anybody that I've made a pull-request for robotcontrol, or will it be picked up eventually (12 days since request) Mar 17 12:31:12 I mean, the recipient of a pull request already gets a notification Mar 17 12:31:25 ok Mar 17 12:31:27 thanks Mar 17 12:32:12 as for wifi, my first thoughts would be to try disabling wifi power management and/or check whether it's running the latest firmware (dmesg | grep 'wlcore: firmware booted') Mar 17 12:32:38 zmatt, wlcore: firmware booted (Rev 8.9.0.0.79) Mar 17 12:33:10 wlan0: Power Management:off, TX-power 0dB Mar 17 12:33:52 oh well, good luck with it :) Mar 17 12:33:59 ? Mar 17 12:34:12 TX-power? Mar 17 12:34:21 0dB i.e. maximum Mar 17 12:34:28 yes Mar 17 12:34:34 Too much? Mar 17 12:34:36 no? Mar 17 12:34:45 I meant "good luck with it" as in, I've no further ideas Mar 17 12:34:51 Ahh :) Mar 17 12:34:53 right Mar 17 12:35:38 And distance between Laptop and BBB 32cm ;-) Mar 17 14:07:32 Hi everyone! I want to make a tutorials for use graphic accelerator of BBB! Where is I can post my tutorial? On BB forum? On BB Github? On wiki form elinux.org or another? Mar 17 14:11:48 you could definitely make a page on the elinux wiki, and post a link to the forum to make it easier to find Mar 17 14:19:25 Ok thank you zmatt Mar 17 14:51:13 how i can setting on my beagle bone black Mar 17 14:54:48 what setting? Mar 17 14:55:06 please describe your *actual* problem in more detail! Mar 17 15:04:42 or not Mar 17 15:28:31 perhaps it was not a question, but a statement :o) Mar 17 22:21:59 zmatt: thanks for answering! i asked immediately before going to bed. wasn't expecting a prompt response, but i guess the third time was a charm. :) v1 meaning before the slight hardware upgrade (doubling of RAM and eMMC, IIRC) Mar 17 22:28:07 zmatt: the context: I was wondering the speed at which paying for a faster SD card would do me absolutely no good. 22 MB/s is just what I needed. Thanks! :) Mar 17 22:49:51 ah. generally it would be a good idea to at least be around for a bit after asking a question Mar 17 22:50:11 RAM hasn't changed in the lifetime of the beaglebone black Mar 17 22:50:24 eMMC was changed in revision C Mar 17 22:51:44 (the specific eMMC used also varies anyway, based on what's cheaply available) Mar 17 23:08:56 Hey zmatt, would be nice if they created eSD instead of eMMC (my opinion) MMC is a very old spec I was just a bit weirded out it is still be used when I noticed it on the BBB. Mar 17 23:10:00 I vaguely know eSD exists but I've never seen it or seen any design that used it. everyone uses eMMC, and the latest eMMC specification (v5.1A) was published January 2019 Mar 17 23:15:04 also the eSD specification appears to be proprietary and not available for download Mar 17 23:16:26 Indeed that is one of the reasons it took so long for anything to support SD. It was heavily patented and designed to replace MMC originally. However most people don't use the patented features of it. So it languished for a long time until someone actually made something to use it. Mar 17 23:17:12 Also the SD card association had to change there documentation and rules or the technology would NEVER end up being used. Mar 17 23:17:57 for SD itself there are public "simplified" specs, but I don't see anything for eSD Mar 17 23:20:18 regardless, eSD is obscure and seems to have few parts (although it's also plain hard to search for). I see absolutely no reason why anyone would want to use it instead of eMMC Mar 17 23:21:14 just as SD cards pushed MMC cards out of the market, eMMC completely dominates the embedded flash storage afaik Mar 17 23:23:42 I am only "complaining" because eSD type interface would use fewer IO pins. However you are right about that. No great loss for the MMC card not being in the market (they were terrible and expensive). Mar 17 23:24:03 it would use fewer pins because it would have half the performance Mar 17 23:25:18 note that you should be able to configure a 4-bit eMMC interface if you're okay with sacrificing 50% of the transfer speed in exchange for four extra I/O pins Mar 17 23:34:48 hell you could limit it to a 1-bit interface (+ cmd + clk) if you really don't care about performance :P Mar 17 23:41:31 LOL, I'll have to check the spec, eMMC and SD are only single edge clocked aren't they? I can see why there would be more limitations with that. Mar 17 23:42:26 they can be ddr depending on the mode used. the AM335x does not support any such modes Mar 17 23:44:22 here's a summary of modes and such for sd cards: https://pastebin.com/raw/rfLzRK0G Mar 17 23:50:30 list of modes for eMMC: https://pastebin.com/raw/HYacE0UZ Mar 17 23:51:43 the max supported by the AM335x is 48 MHz "HS" mode, 4-bit for SD, max 8-bit for eMMC Mar 18 00:15:35 The power levels are a bit high. I see what you mean however. DDR is optional. No one supports it either, I haven't seen DDR on STM32 stuff or other devices that support SD type interfaces. Mar 18 00:48:34 I'm trying to figure out what the best course of action is to get this board working, https://github.com/fastbot3d I think the only thing I need to reuse is the uboot hack to fix the fact that it doesn't have a board ID. Mar 18 00:49:49 It is my understanding that it is a BBB system with a bunch of SPI controlled stepper drivers and different I/O. I'm not opposed to rewriting the IO driver but I need to figure out what the best course of action would be. **** ENDING LOGGING AT Mon Mar 18 03:00:21 2019