On Monday, 19 March 2018 23:55:04 UTC+2, Troy Weber wrote:
> 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?

What's the file system on the SD card? FAT? ext4?


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