ref: 4dab28b14f62cc7f4b474d7e45941d6fbf26f5a7 dir: /sys/src/9/bcm64/init9.s/
TEXT main(SB), 1, $8 MOV $setSB(SB), R28 /* load the SB */ MOV $boot(SB), R0 B startboot(SB)