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My onion2+ uses a 1GB sd card as a root overlay.
for some unknown reason, 3 "invalid encoding" files with zero byte length are written on the root fs, "/". I have no idea what process creates these 3 files.
When these these files are present they interfere with /dev/ttyS1 communications and affect both python scripts and avrude write operations to the arduino dock2.
to correct this problem, I remove the SD card from the onion, fsck it in a laptop, (which is clean, without issue), and use nautilus to delete the 3 files from the SD card.
Restarting the onion with the files removed, serial communications to /dev/ttyS1 returns to normal.
well after some more research, i am going to drop the linear regulator for step-down buck switching regulators. i will update the schematic and share my final solution when i have it working.
Hi @Amyanshu-Jenamani ,
You can increase the available memory by creating a swap file on the USB drive. We have a guide on this here: https://docs.onion.io/omega2-docs/extending-omega-memory.html
Since you are already booting from the USB drive, I advise you back up your data before attempting this.
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