FreeCalypso > hg > freecalypso-tools

annotate target-utils/compalstage/compalstage.S @ 893:85091e14be9c

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fc-buzplay: PWT refactoring, first step
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 03 Apr 2022 08:00:50 +0000
parents 21eec7569eb8
children
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1 .text
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2 .org 0
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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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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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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
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29 * actual comparison check in all currently known boot code versions is
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30 * an inequality (the signature bytes in the downloaded image need to be
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31 * greater than or equal to the hard-coded reference values), always
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32 * putting "1004" in our compalstage image instead of "1003" should satisfy
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33 * all existing C1xx boot code versions, or at least all currently known
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34 * ones. However, having an image named compalstage-1003.bin with the
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35 * corresponding -c 1003 loadtools option that is actually "1004" inside
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36 * feels a little "wrong" in some sense, while getting rid of the -c 1003
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37 * option would break old user instructions, hence let's go ahead and do the
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38 * silly exercise of building both "1003" and "1004" versions.
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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