FreeCalypso > hg > freecalypso-tools

annotate target-utils/compalstage/compalstage.S @ 926:6a0aa8d36d06

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rvinterf backslash escape: introduce libprint The new helper function library named libprint is meant to replace the badly misnamed libg23, and will soon contain functions for printing all of the same kinds of GPF TST packets that are now handled in libg23. However, we are also moving safe_print_trace() from libasync to this new library, and changing it to emit our new backslash escape format.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 23 May 2023 03:47:46 +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