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<Guest31>
I am trying to read keyboard input in BeagleBone Black. It is working well for some time, but suddenly stops. We couldn’t recover that without restarting the program. What might have gone wrong?
<zmatt>
looks like the usb device is disconnecting
<zmatt>
"babble" means the usb controller thinks the device is trying to continue to transmit after the end of frame (i.e. "keeps babbling"), I think I've seen other reports of this but I can't remember what might cause it
<Guest31>
As USB was not responding, we tried to disconnect and connect another USB device. This is what it shows as disconnect in logs.
<zmatt>
there are five disconnects in your log, all but one are immediately preceded by a "musb-hdrc musb-hdrc.1: Babble" warning from the kernel
<zmatt>
and a Babble event *will* cause a usb device connection, that part is correct... the question is what's causing this erroneous babble detection, since it's unlikely the usb device is genuinely babbling
<zmatt>
also, your application should definitely be able to recover from this but that depends on how it's interfacing with the device
<zmatt>
you could try inserting a usb hub between the beaglebone and the device to see if that fixes the problem
<zmatt>
what kernel version are you running?
<Guest31>
Kernel version: 4.14.71-ti-r80
<Guest31>
We are using Barcode scanner. It's wireless receiver is connected to the USB port. Does it need USB hub?
<zmatt>
it's worth trying as workaround
<zmatt>
you should probably also try updating the kernel, since I know that there used to be more issues with usb in older kernels
<zmatt>
e.g. at least to the latest in the 4.14-ti series, but preferably you should try the 4.19-ti series
<Tafarrel>
Hi, I want to ask for beaglebone Industrial users.. How is the reliability and durability of the device? the project will be about turnstile system, it will be used outdoor (with temp around 45-55) degrees and could handle 5000 users. any opinion? Thanks!
<zmatt>
Guest31: the latest kernel in the 4.14-ti series is 4.14.108-ti-r144
<zmatt>
Tafarrel: I'm not sure but I think the main difference between the industrial and the normal one is a lower minimum operating temperature?
<zmatt>
Tafarrel: not sure what you mean by "could handle 5000 users"
<zmatt>
obviously outdoor use has its complications, since making it well-protected against moisture may interfere with adequate ventilation for cooling and vice versa, though the BBB typically doesn't get super hot (but that'll also depend on what it's doing of course)
<zmatt>
Tafarrel: it's hard to give useful feedback honestly... BBBs have proven pretty reliable for us in a fairly warm and poorly ventilated environment
<zmatt>
but it'll depend on many factors obviously
<Guest31>
Thanks zmatt. We will try USB hub and 4.19 update.
<Guest31>
We are using a program similar to this one to read:
<Guest31>
When we restart this, the USB starts working again. Not sure how this explains the scenario. Do you suggest any other method?
<zmatt>
Guest31: I mean, the babble event causes the usb driver to disconnect the device, and it then immediately reconnects. presumably your application only looks for a device once at startup instead of detecting usb hotplug events (e.g. using libudev) which is why you need to restart your application to recover
<Tafarrel>
zmatt: It will have local database consist of the users data. Then, it will do data validations and checking whether the user have access or not to this turnstile. At the same time it's also syncing new data and upload the event log to the server. Approx of 5000 workers will be using the turnstile gate system
<zmatt>
Tafarrel: I mean, how many users there are in your db is not really significant, especially not for such a small number
<zmatt>
for long-term reliability it is a good idea to try to minimize unnecessary writes to eMMC, since (like every type of NAND flash based storage) it will eventually wear out after enough writes
<zmatt>
(we also reconfigure the eMMC into SLC mode with reliable writes enabled, to make the eMMC as robust as possible... SLC mode sacrifices 50% of the eMMC's capacity but we only use a few hundred MB aynway)
<Tafarrel>
zmatt : Got it, I'll try to use this for my project. Thanks Matt.
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<ds2>
zmatt: is the tool to reconfigure the eMMC openly available?
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<zmatt>
an interesting side-effect I noticed is that writes are much faster in SLC mode (even though reliable-writes presumably reduces write performance, this appears to be outweighed by the faster programming of cells in SLC mode compared to MLC mode)
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<ds2>
isn't a MLC - keep writing til it reads back right strategy?
<ds2>
MLC write I mean
<zmatt>
it has to hit a particular level yeah
<zmatt>
while SLC is just "program all the way"
<zmatt>
so it makes perfect sense that it's faster
<ds2>
shove as much charge as you can to the gate vs shove enough charge to meet the level
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<azarubkin>
Hello everyone, my Beaglebone Black boots the microSD card whenever it's inserted, even without pressing the BOOT button, what could be the cause? I thought it should boot the internal eMMC by default. It is flashed with the latest official image, if there's no microSD card, it boots the internal eMMC as it should.
<rcn-ee>
azarubkin: u-boot is setup to scan microSD first.. (looking for trigger files "uEnv.txt"..)
<azarubkin>
rcn-ee: so this behaviour is expected and normal?
<rcn-ee>
if the microsd has, "uEnv.txt" or "boot.scr" in 2 possible locations, eMMC's u-boot will run it..
<rcn-ee>
crazy, it's been 8 years, haven't changed that. ;)
<azarubkin>
Wait. The boot process is as follows:
<azarubkin>
1. If the BOOT button is not pressed, a bootloader in eMMC is started. If the BOOT button is pressed, then a bootloader on the SD card is started.
<rcn-ee>
i am close to using extlinux (now that i got overlays working in it..)
<azarubkin>
2. Then the bootloader always scans the SD card first?
<rcn-ee>
azarubkin: the "boot" button only changes what media is scanned first... While in "U-Boot" it self, i've written it to always scan microSD before eMMC.. for reading "uEnv.txt"/"boot.scr"..
<azarubkin>
I see, so my description of the boot process is correct.
<rcn-ee>
azarubkin: your confusing "hardware" and "software"..
<azarubkin>
I wonder then what BOOT button is for - just to control where the u-boot is loaded from?
<rcn-ee>
The BOOT button, is a single pull-up (or) pull-down, to move one line on the sysboot pin's... (it's in the SRM)... It changes the boot order in the AM335x ROM CODE... when pushed, the ROM CODE scan's the microSD FIRST...
<rcn-ee>
Normally, eMMC is first.. (With button not pressed)...
<rcn-ee>
For end users, this just specifies which media (microSD/eMMC) that "MLO" is loaded from..
<rcn-ee>
Once MLO is loaded and run, u-boot-dtb.img is loaded and run, then everything is ran how software coded in u-boot to run..
<brook>
The eMMC MLO runs u-boot from the eMMC, right? So there could be two different u-boots, one on each device and they might have different configurations, no?
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<rcn-ee>
brook: "correct"... that's why when we recommend a new image, we always say, hold the boot button down, insert power, and then let off once the LED turns on.. this ensures the latest version is always loaded. ;)
<azarubkin>
@rcn-ee: I'm looking at the image-builder script (https://github.com/RobertCNelson/omap-image-builder) - when I build the image, there is "deploy" subdirectory, then another subdirectory named after the image. Inside it, there's "hwpack" subdirectory with different .conf files for different boards.
<azarubkin>
I guess I should use beaglebone.conf for Beaglebone Black?
<azarubkin>
I also created a new config file for image-builder where I removed all kernel and u-boot packages because I'd like to install the local ones
<azarubkin>
I can share it if you need when tracing the issue
<azarubkin>
Is it allowed to dd the whole image from microSD card to the eMMC?
<azarubkin>
I think some paths should be corrected, e.g. in /etc/fstab, right?
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<lampiao>
Good afternoon! I wonder if I can connect Beagle Bone Black on the computer by the miniUSB cable while feeding the BBB by DC Power with a source of 5v and 1A.
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<rcn-ee>
lampiao: yess
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<lampiao>
rcn-ee: tanks
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<set_>
Did I miss the buildroot for BBB chat yet?
<set_>
Sorry. Forget it. I will just fade unto another day. Do not fret. I am just joking. I will figure something out one day.
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