FreeCalypso > hg > freecalypso-tools

annotate target-utils/compalstage/compalstage.S @ 597:ca4433b714d2

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
CHANGES: fc-fsio cleaning commands documented
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 04 Feb 2020 18:22:22 +0000
parents 21eec7569eb8
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
0
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
1 .text
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
2 .org 0
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
3
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
4 #if THUMB_ENTRY
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
5 .code 16
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
6 bx pc
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
7 nop
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
8 #endif
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
9 .code 32
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
10
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
11 /* delay loop like OsmocomBB does */
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
12 mov r1, #0xa0000
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
13 1: subs r1, r1, #1
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
14 bne 1b
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
15 /* enable the Calypso boot ROM */
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
16 ldr r1, reg_addr
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
17 mov r2, #0x0100
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
18 strh r2, [r1]
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
19 /* jump to it! */
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
20 mov pc, #0
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
21 reg_addr:
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
22 .word 0xFFFFFB10
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
23
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
24 #if PAD_TO_1003
11
21eec7569eb8 loadtools support for C139/140 target: -c 1004 compalstage variant
Mychaela Falconia <falcon@freecalypso.org>
parents: 0
diff changeset
25 /*
21eec7569eb8 loadtools support for C139/140 target: -c 1004 compalstage variant
Mychaela Falconia <falcon@freecalypso.org>
parents: 0
diff changeset
26 * The older and most familiar versions of C139/140 boot code expect the
21eec7569eb8 loadtools support for C139/140 target: -c 1004 compalstage variant
Mychaela Falconia <falcon@freecalypso.org>
parents: 0
diff changeset
27 * signature bytes to be "1003" or greater, but a recently encountered
21eec7569eb8 loadtools support for C139/140 target: -c 1004 compalstage variant
Mychaela Falconia <falcon@freecalypso.org>
parents: 0
diff changeset
28 * newer version expects them to be "1004" or greater instead. As the
21eec7569eb8 loadtools support for C139/140 target: -c 1004 compalstage variant
Mychaela Falconia <falcon@freecalypso.org>
parents: 0
diff changeset
29 * actual comparison check in all currently known boot code versions is
21eec7569eb8 loadtools support for C139/140 target: -c 1004 compalstage variant
Mychaela Falconia <falcon@freecalypso.org>
parents: 0
diff changeset
30 * an inequality (the signature bytes in the downloaded image need to be
21eec7569eb8 loadtools support for C139/140 target: -c 1004 compalstage variant
Mychaela Falconia <falcon@freecalypso.org>
parents: 0
diff changeset
31 * greater than or equal to the hard-coded reference values), always
21eec7569eb8 loadtools support for C139/140 target: -c 1004 compalstage variant
Mychaela Falconia <falcon@freecalypso.org>
parents: 0
diff changeset
32 * putting "1004" in our compalstage image instead of "1003" should satisfy
21eec7569eb8 loadtools support for C139/140 target: -c 1004 compalstage variant
Mychaela Falconia <falcon@freecalypso.org>
parents: 0
diff changeset
33 * all existing C1xx boot code versions, or at least all currently known
21eec7569eb8 loadtools support for C139/140 target: -c 1004 compalstage variant
Mychaela Falconia <falcon@freecalypso.org>
parents: 0
diff changeset
34 * ones. However, having an image named compalstage-1003.bin with the
21eec7569eb8 loadtools support for C139/140 target: -c 1004 compalstage variant
Mychaela Falconia <falcon@freecalypso.org>
parents: 0
diff changeset
35 * corresponding -c 1003 loadtools option that is actually "1004" inside
21eec7569eb8 loadtools support for C139/140 target: -c 1004 compalstage variant
Mychaela Falconia <falcon@freecalypso.org>
parents: 0
diff changeset
36 * feels a little "wrong" in some sense, while getting rid of the -c 1003
21eec7569eb8 loadtools support for C139/140 target: -c 1004 compalstage variant
Mychaela Falconia <falcon@freecalypso.org>
parents: 0
diff changeset
37 * option would break old user instructions, hence let's go ahead and do the
21eec7569eb8 loadtools support for C139/140 target: -c 1004 compalstage variant
Mychaela Falconia <falcon@freecalypso.org>
parents: 0
diff changeset
38 * silly exercise of building both "1003" and "1004" versions.
21eec7569eb8 loadtools support for C139/140 target: -c 1004 compalstage variant
Mychaela Falconia <falcon@freecalypso.org>
parents: 0
diff changeset
39 */
0
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
40 .org 0x3be0
11
21eec7569eb8 loadtools support for C139/140 target: -c 1004 compalstage variant
Mychaela Falconia <falcon@freecalypso.org>
parents: 0
diff changeset
41 #if MAGIC_1004
21eec7569eb8 loadtools support for C139/140 target: -c 1004 compalstage variant
Mychaela Falconia <falcon@freecalypso.org>
parents: 0
diff changeset
42 .ascii "1004"
21eec7569eb8 loadtools support for C139/140 target: -c 1004 compalstage variant
Mychaela Falconia <falcon@freecalypso.org>
parents: 0
diff changeset
43 #else
0
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
44 .ascii "1003"
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
45 #endif
11
21eec7569eb8 loadtools support for C139/140 target: -c 1004 compalstage variant
Mychaela Falconia <falcon@freecalypso.org>
parents: 0
diff changeset
46 #endif