FreeCalypso > hg > freecalypso-tools
annotate target-utils/compalstage/compalstage.S @ 613:ab4021fb1c66
doc/Loadtools-performance: flash programming added
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Mon, 24 Feb 2020 22:30:00 +0000 |
parents | 21eec7569eb8 |
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1 .text |
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2 .org 0 |
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3 |
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4 #if THUMB_ENTRY |
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5 .code 16 |
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6 bx pc |
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7 nop |
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8 #endif |
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9 .code 32 |
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10 |
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11 /* delay loop like OsmocomBB does */ |
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12 mov r1, #0xa0000 |
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13 1: subs r1, r1, #1 |
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14 bne 1b |
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15 /* enable the Calypso boot ROM */ |
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16 ldr r1, reg_addr |
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17 mov r2, #0x0100 |
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18 strh r2, [r1] |
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19 /* jump to it! */ |
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20 mov pc, #0 |
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21 reg_addr: |
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22 .word 0xFFFFFB10 |
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23 |
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24 #if PAD_TO_1003 |
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25 /* |
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26 * The older and most familiar versions of C139/140 boot code expect the |
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27 * signature bytes to be "1003" or greater, but a recently encountered |
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28 * newer version expects them to be "1004" or greater instead. As the |
21eec7569eb8
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29 * actual comparison check in all currently known boot code versions is |
21eec7569eb8
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Mychaela Falconia <falcon@freecalypso.org>
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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>
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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>
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32 * putting "1004" in our compalstage image instead of "1003" should satisfy |
21eec7569eb8
loadtools support for C139/140 target: -c 1004 compalstage variant
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33 * all existing C1xx boot code versions, or at least all currently known |
21eec7569eb8
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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>
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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:
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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>
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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>
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38 * silly exercise of building both "1003" and "1004" versions. |
21eec7569eb8
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Mychaela Falconia <falcon@freecalypso.org>
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39 */ |
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40 .org 0x3be0 |
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41 #if MAGIC_1004 |
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42 .ascii "1004" |
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43 #else |
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44 .ascii "1003" |
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45 #endif |
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46 #endif |