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annotate target-utils/compalstage/compalstage.S @ 992:a7b0b426f9ca

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target-utils: boot ROM UART autodetection revamped The new implementation should work with both the familiar Calypso C035 boot ROM version found in our regular targets as well as the older Calypso F741979B version found on the vintage D-Sample board.
author Mychaela Falconia <falcon@ivan.Harhan.ORG>
date Wed, 30 Dec 2015 21:28:41 +0000
parents 48c08499cede
children
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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 .org 0x3be0
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26 .ascii "1003"
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27 #endif