ref: 435a0f18d5a5f372b4d5a30953e8d6bfd9cf6d17 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)