ref: 2f6c3ee3bcdfd540eb0d0bf8ce90a2a97e1f3850 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)