ref: 0d4b5b8a8a6e38faf3a07774f97dbf66797f8dea 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)