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Troy Weber
Mar 19, 2018, 5:55:04 PM3/19/18
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Hello!
I have an application running on the Beaglebone Black. It runs from the eMMC because we need to mount a blank SD card and occasionally store data or video on the external SD card. Here are some details to jog ideas:
- using a Bealgebone black
- connected to a powered hub and running 2 led strips and 1 camera
- made a custom cape/shield that allows us to interface with
- an RGB button
- a 16x2 char lcd
- an optically isolated relay module
- the relay module runs a solenoid circuit (in which I'm currently debugging the need for a flyback diode)
- the SD card is mounted using /etc/fstab with the line /dev/mmcblk0p1 /media/sd auto auto,nofail,user,dmask=022,fmask=111 0 0
- SD cards are inexpensive and found here: https://www.amazon.com/gp/product/B00WUCNGVQ/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
My application is writing files to the SD card only on certain occasions during which the Beaglebone will not be hard-rebooted. However, it will be hard-rebooted (and the application started by systemd on next boot) as a means of shutting it down.
The problem is that I've recently began to discover issues with the blank SD card on next boot after a hard reboot. For a short time I can touch and write vim files on the card just fine. Once I start up the node.js program, part way through it complains about the SD card being read-only. From then on I cannot touch or vim files anymore. So I reformat the card and copy the configuration files back on. I've noticed that one of my configuration files is chopped short.
Here are some things I've tried and intend to try:
- have tried
- removing the power to the hub which seemed to be back-powering the BBB (still fails on reboot)
- stopping the program that writes files entirely (still fails on reboot)
- intend to try
- writing the configuration files elsewhere (on the eMMC for example)
- better SD cards
In the meantime, any ideas?
Robert Nelson
Mar 19, 2018, 6:05:22 PM3/19/18
to Beagle Board, Troy Weber
Regards,
--
Robert Nelson
https://rcn-ee.com/
Troy Weber
Mar 19, 2018, 6:43:45 PM3/19/18
to BeagleBoard
I will try that. I read up on noatime.
noatime
Do not update inode access times on this filesystem (e.g., for
faster access on the news spool to speed up news servers). This
works for all inode types (directories too), so implies
nodiratime.If this works, I'll be curious why. I guess I don't know enough about inodes just yet to understand why this might be a solution.
evilwulfie
Mar 19, 2018, 6:53:29 PM3/19/18
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does it unmount properly every time on
reboot ?
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Troy Weber
Mar 19, 2018, 7:03:23 PM3/19/18
to BeagleBoard
Probably not. I should clarify that by a "hard reboot" I mean that essentially someone pulls the plug (or toggles a switch in the back). So no effort (to my knowledge) is made to unmount the micro SD card.
Troy Weber
Mar 19, 2018, 7:28:01 PM3/19/18
to BeagleBoard
I failed to attach it. It would not download the file (due to an io error). So the file I just attached is empty. When I cat the file on the linux system I get the following:
# cat /media/sd/config/WaterfallDiceGame.json { "_id": 302, "name": "diceGamePrototype", "type": "system", "label": "Dice Game Prototype", "packageName": "../../../../lib/hardware/oddson-waterfall-dice-game-system", "adapters": [], "drivers": [ { "_id": 200, "name": "button", "label": "Button", "type": "driver", "packageName": "@synap/bonescript-state-sensor-driver", "adapters": [], "config": { "activeValue": 1, "pin": "P8_33", "debounce": { "checkRate": 1, "checks": 20 } } }, { "_id": 201, "name": "buttonRed", "label": "Button Red", "type": "driver", "packageName": "@synap/bonescript-state-switch-driver", "adapters": [], "config": { "pin": "P8_46", "activeState": 1, "startOn": false } }, { "_id": 202, "name": "buttonGreen", "label": "Button Green", "type": "driver", "packageName": "@synap/bonescript-state-switch-driver", "adapters": [], "config": { "pin": "P8_36", "activeState": 1, "startOn": false } }, { "_id": 203, "name": "buttonBlue", "label": "Button Blue", "type": "driver", "packageName": "@synap/bonescript-state-switch-driver", "adapters": [], "config": { "pin": "P8_34", "activeState": 1, "startOn": false } }, { "_id": 210, "name": "solenoid1", "label": "Solenoid 1", "type": "driver", "packageName": "@synap/bonescript-state-switch-driver", "adapters": [], "config": { "pin": "P8_29", "activeState": 0, "startOn": false } }, { "_id": 211, "name": "solenoid2", "label": "Solenoid 2", "type": "driver", "packageName": "@synap/bonescript-state-switch-driver", "adapters": [], "config": { "pin": "P8_27", "activeState": 0, "startOn": false } }, { "_id": 220, "name": "diceCam", "label": "Camera", "type": "driver", "packageName": "../../../../lib/hardware/ffmpeg-camera-driver", "adapters": [], "config": { "camera": "/dev/video0", "video": { "filename": "roll.avi", "date": true, "time": true, "width": 1024, "height": 576, "fps": 15, "duration": 4 }, "photo": { "filename": "photo.jpg", "date": true, "time": true, "width": 640, "height": 480 } } }, { "_id": 230, "name": "lights1", "label": "Lights 1", "type": "driver", "packageName": "../../../../lib/hardware/oddson-blinkstick-driver", "adapters": [], "config": { "serialNo": "BS016951-3.1", "ledCount": 15, "animation": [ { "duration": 250, "data": [ 255, 0, 0 ] }, { "duration": 250, "data": [ 255, 63, 0 ] }, { "duration": 250, "data": [ 255, 127, 0 ] }, { "duration": 250, "data": [ 255, 191, 0 ] }, { "duration": 250, "data": [ 255, 255, 0 ] }, { "duration": 250, "data": [ 191, 255, 0 ] }, { "duration": 250, "data": [ 127, 255, 0 ] }, { "duration": 250, "data": [ 63, 255, 0 ] }, { "duration": 250, "data": [ 0, 255, 0 ] }, { "duration": 250, "data": [ 0, 255, 63 ] }, { "duration": 250, "data": [ 0, 255, 127 ] }, { "duration": 250, "data": [ 0, 255, 191 ] }, { "duration": 250, "data": [ 0, 255, 255 ] }, { "duration": 250, "data": [ 0, 191, 255 ] }, { "duration": 250, "data": [ 0, 127, 255 ] }, { "duration": 250, "data": [ 0, 63, 255 ] }, { "duration": 250, "data": [ 0, 0, 255 ] }, { "duration": 250, "data": [ 63, 0, 255 ] }, { "duration": 250, "data": [ 127, 0, 255 ] }, { "duration": 250, "data": [ 191, 0, 255 ] }, { "duration": 250, "data": [ 255, 0, 255 ] }, { "duration": 250, "data": [ 255, 0, 191 ] }, { "duration": 250, "data": [ 255, 0, 127 ] }, { "duration": 250, "data": [ 255, 0, 63 ] } ] } }, { "_id": 231, "name": "lights2", "label": "Lights 2", "type": "driver", "packageName": "../../../../lib/hardware/oddson-blinkstick-driver", "adapters": [], "config": { "serialNo": "BS016957-3.1", "ledCount": 15, "animation": [ { "duration": 250, "data": [ 255, 0, 0 ] }, { "duration": 250, "data": [ 255, 63, 0 ] }, { "duration": 250, "data": [ 255, 127, 0 ] }, { "duration": 250, "data": [ 255, 191, 0 ] }, { "duration": 250, "data": [ 255, 255, 0 ] }, { "duration": 250, "data": [ 191, 255, 0 ] }, { "duration": 250, "data": [ 127, 255, 0 ] }, { "duration": 250, "data": [ 63, 255, 0 ] }, { "duration": 250, "data": [ 0, 255, 0 ] }, { "duration": 250, "data": [ 0, 255, 63 ] }, { "duratcat: /media/sd/config/WaterfallDiceGame.json: Input/output errorevilwulfie
Mar 19, 2018, 7:42:59 PM3/19/18
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Well yes if you fail to unmount a file system you can have issues.
On my systems i designed a battery backup system to prevent just the
issues you
are seeing now.
It does not happen all the time but one time is unacceptable.
Beaglebone is a live filesystem and you cant just pull the plug.
On my systems i designed a battery backup system to prevent just the
issues you
are seeing now.
It does not happen all the time but one time is unacceptable.
Beaglebone is a live filesystem and you cant just pull the plug.
Troy Weber
Mar 19, 2018, 7:57:16 PM3/19/18
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Well we need to be able to pull the plug without damaging things. Is the best option then to have a battery system that allows BBB to listen for loss of power and gracefully shut down? Are there alternative methods?
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evilwulfie
Mar 19, 2018, 7:59:29 PM3/19/18
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I dont know if its for sale there was a
battery cape
or you can go with custom hardware
or you can go with custom hardware
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Graham
Mar 19, 2018, 8:55:12 PM3/19/18
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As a matter of buffer hygiene, are you flushing the buffers to the sd card after every time you write to it?
Something like the equivalent of the 'sync' command?
If there is still unwritten info in the buffers when the power gets pulled, bye-bye data.
In Linux, when the mounted drive is suddenly declared "read-only" it means that the OS has observed some corruption or error in the file system, and does so to prevent further corruption.
--- Graham
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Troy Weber
Mar 19, 2018, 9:00:27 PM3/19/18
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probably not! I'll have to look into flushing buffers, I've never heard of that.
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evilwulfie
Mar 19, 2018, 10:22:26 PM3/19/18
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the EMMC can also suffer from the plug
being pulled
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Troy Weber
Mar 20, 2018, 1:29:00 PM3/20/18
to BeagleBoard
How would you flush the sd card buffers from node.js? To write to the files I am doing using the writeFileSync command.
Graham Haddock
Mar 20, 2018, 2:53:54 PM3/20/18
to BeagleBoard
I don't use node.js, so I am not familiar with it.
The name of the function suggests that it does a 'sync' after the write, which is what you want.
In Linux, the 'sync' command flushes all the buffers to disk.
I would just read the manual on the function to make sure it is doing what you want.
--- Graham
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Tarmo Kuuse
Apr 4, 2018, 11:24:05 AM4/4/18
to BeagleBoard
What's the file system on the SD card? FAT? ext4?
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Tarmo
evilwulfie
Apr 4, 2018, 11:57:41 AM4/4/18
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you cannot just do a hard shutdown you
must use a shutdown now command
you always risk file system corruption if you do not
you always risk file system corruption if you do not
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