ref: 14aea8266dbbbdcfe9947451e10db4889e3cbcb7
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