Clean OS (Debian), OpenMediaVault and other "firmwares"

fustbariclation wrote:

Partition 7 is the DataVolume partition, I think - what is partition 8? Is it the SD card

But the firmware is installed from the SD card by booting from the ‘update’ directory. 

Do you have the source of /env/bon/boot_sata  — It must have a provision for booting from the SD card.

No. You wrong:

/dev/sda1 - raid 1 Disk #1 - Root FS (mdadm raid)
/dev/sda2 - raid 1 Disk #2
/dev/sda3 - Swap
/dev/sda4 - Ext4 - User data (DataVolume)
/dev/sda5 - Main kernel
/dev/sda6 - backup kernel (Не используется вообще нигде)
/dev/sda7 - Boot config for Barebox
/dev/sda8 - Backup config (Not used)

There is no support for SD card. Only sata port (‘sata’ command from boot script initializing internal sata port. USB port not used at boot)