FreeCalypso > hg > freecalypso-tools
comparison target-utils/tf-breakin/payload.S @ 0:e7502631a0f9
initial import from freecalypso-sw rev 1033:5ab737ac3ad7
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Sat, 11 Jun 2016 00:13:35 +0000 |
| parents | |
| children |
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| -1:000000000000 | 0:e7502631a0f9 |
|---|---|
| 1 .text | |
| 2 .org 0 | |
| 3 | |
| 4 @ allow entry in Thumb state | |
| 5 .code 16 | |
| 6 bx pc | |
| 7 nop | |
| 8 | |
| 9 .code 32 | |
| 10 | |
| 11 @ set CPSR like mot931c payload does | |
| 12 msr CPSR_c, #0xd3 | |
| 13 @ disable the watchdog | |
| 14 ldr r1, =0xfffff802 | |
| 15 mov r0, #0xf5 | |
| 16 strh r0, [r1, #2] | |
| 17 mov r0, #0xa0 | |
| 18 strh r0, [r1, #2] | |
| 19 @ MODEM UART | |
| 20 ldr r6, =0xffff5800 | |
| 21 @ wait for any previous output to flush out | |
| 22 1: ldrb r0, [r6, #5] | |
| 23 tst r0, #0x20 | |
| 24 beq 1b | |
| 25 @ send our indication | |
| 26 adr r1, outstr | |
| 27 mov r2, #6 | |
| 28 1: ldrb r0, [r1], #1 | |
| 29 strb r0, [r6] | |
| 30 subs r2, r2, #1 | |
| 31 bne 1b | |
| 32 @ wait for this output to go out to the TxD pin | |
| 33 1: ldrb r0, [r6, #5] | |
| 34 tst r0, #0x40 | |
| 35 beq 1b | |
| 36 @ enable the Calypso boot ROM | |
| 37 ldr r1, =0xFFFFFB10 | |
| 38 mov r2, #0x0100 | |
| 39 strh r2, [r1] | |
| 40 @ jump to it! | |
| 41 mov pc, #0 | |
| 42 .ltorg | |
| 43 outstr: .byte 2,2,2,'O','K',2 |