Hardcoded partitions in mkinitfs
This adds the pmos_boot and pmos_root parameters to the linux cmdline.
example:
pmos_boot=/dev/mmcblk0p1 pmos_root=/dev/mmcblk0p2
This is to skip the autodetection that might fail if there's multiple root partitions like on devices with eMMC and SD storage.
Fixes #387 (closed)