I'm trying to turn two APU1D into Samba ADDCs. After installing Debian Jessie on the internal empty mSata SSD (using an USB stick and following ssinyagins excellent instructions), I tinkered around with one of the APUs and finally decided to reinstall the os. But the APU won't boot from USB anymore, even if USB1 and USB2 are higher in the APUs boot order than the SSD.
A short research brought up the following statement by OpenWRT (http://wiki.openwrt.org/toh/pcengines/apu):
If you're booting from an SD card or USB stick as soon as the SSD is detected the boot loader will switch to it and disable the USB/SD boot and the system will hang. This means that you cannot bootstrap an empty SSD by booting from a USB stick and formatting the SSD. Once you boot successfully from the SSD, you can plug in a USB stick and it will be detected normally.
That's exactly what I'm experiencing: the serial console works without any problem, I choose to boot from USB, but still the APU tries to boot from hard disk, i.e. the SSD, and then hangs. The USB stick can only be used from within the installed os.
Thus it seems to me that I won't be able to install any other os to the SSD anymore. Is this assumption correct? Please tell me it's not... Any help or guidance in order to reinstall the os is highly appreciated.
Thank you in advance.
OK, solution: it's allways a good idea to check the stick again as well... turned out it didn't boot properly even with the SSD removed, the APU's BIOS didn't accept it. So I rebuilt the stick and now it boots as expected. Still I don't know what damaged the stick's content, but anyway...