FreeCalypso > hg > freecalypso-tools

annotate target-utils/compalstage/compalstage.S @ 505:7bf0d909c87e

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fc-loadtool flash ID check: change of reset after the check logic This change only affects those flash configurations that have ID checks enabled. The logic for resetting the flash after the ID check has been changed as follows: 1) If the check fails, we return without attempting to reset the flash. 2) If the check is successful, we reset the flash using the configured method (could be AMD or Intel or Intel W30) instead of always doing an AMD flash reset as the original code did.
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 27 May 2019 19:58:01 +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