ref: d79c8496a265c3d71d0e5537471ffbb41fa33c24
dir: /sys/src/9/port/bootfs.proto/
$cputype bin 9660srv awk aux kbdfs bind cat cryptsetup dd disk fdisk kfs prep dossrv echo cwfs64x grep ip ipconfig ls mkdir mntgen mount rc rm sed srv test unmount usb usbd xd rc lib rcmain local.rc 555 sys sys ../boot/local.rc tcp.rc 555 sys sys ../boot/tcp.rc bin fstype diskparts bootrc 555 sys sys ../boot/bootrc tmp