FreeCalypso > hg > freecalypso-tools
view target-utils/tf-breakin/payload.S @ 479:f2a040324509
Makefile hierarchy: CFLAGS override-ability actually works now
The original version was broken in that CFLAGS=${CFLAGS} passing was
done without quotes, which breaks as soon as there is a space in the
user-set CFLAGS. Changing it to CFLAGS="${CFLAGS}" makes it work
as originally intended.
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Thu, 14 Feb 2019 04:59:23 +0000 |
| parents | e7502631a0f9 |
| children |
line wrap: on
line source
.text .org 0 @ allow entry in Thumb state .code 16 bx pc nop .code 32 @ set CPSR like mot931c payload does msr CPSR_c, #0xd3 @ disable the watchdog ldr r1, =0xfffff802 mov r0, #0xf5 strh r0, [r1, #2] mov r0, #0xa0 strh r0, [r1, #2] @ MODEM UART ldr r6, =0xffff5800 @ wait for any previous output to flush out 1: ldrb r0, [r6, #5] tst r0, #0x20 beq 1b @ send our indication adr r1, outstr mov r2, #6 1: ldrb r0, [r1], #1 strb r0, [r6] subs r2, r2, #1 bne 1b @ wait for this output to go out to the TxD pin 1: ldrb r0, [r6, #5] tst r0, #0x40 beq 1b @ enable the Calypso boot ROM ldr r1, =0xFFFFFB10 mov r2, #0x0100 strh r2, [r1] @ jump to it! mov pc, #0 .ltorg outstr: .byte 2,2,2,'O','K',2