Am 2020-06-13 10:31, schrieb richard lucassen:
> The nofail means that it wil mount automatically, but if the disk
> is absent it won't give errors. But it does not wait for the device!

The disk has itś own power supply and is always connected. I think there
is something missing at the boot stage (driver?).

> ok, I assume it's u-boot? In that case you can easily try to boot from
> another disk. But apparently you do not have access to the device?

I don't know the boot process. I think it's like a Raspberry Pi. There
is a little FAT partion and a EXT4 root partition on emmc. Since it is
headless, I only can access it through ssh. When it does not boot I have
to open it, remove the emmc card, insert it into an adapter and reverse
my changes on pc.This is very elaborate. So I need a straightforward
method to isolate the problem.