ref: 7ce8dc2e5607fdf5f34dd35e29928faadf5503d5
dir: /sys/src/9/port/bootfs.proto/
$cputype bin 9660srv awk bind bzfs cat dd disk fdisk kfs prep dossrv echo cwfs64x grep gunzip hoc ip ipconfig ls mount ramfs rc read rm sed seq sleep 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