Bootorder

To get boot devices, use cbmem, part of coreboot project.

Compile and install:

cd coreboot/util/cbmem
make
sudo make install

Run it to retrieve the boot devices:

sudo cbmem -c | grep "Searching bootorder" >> bootorder.txt

Rearrange the bootorder to your needs inside the file bootorder.txt and add it to your coreboot.rom:

sudo cbfstool coreboot.rom add -f bootorder.txt -n bootorder -t raw