ref: 3e7d71878bbb318a3774a2b5a75965e41e6a4a43
dir: /sys/src/boot/reform/boot.txt/
mw.b 0x40010000 0x0 0x10000
load ${devtype} ${devnum}:${bootpart} 0x40010000 ${prefix}plan9.ini
load ${devtype} ${devnum}:${bootpart} 0x40100000 ${prefix}9reform.u && bootm 0x40100000