Hi Paul,
Recent 2.6-git (from Wednesday) tree fails to boot on 8xx due to:
BDI>i
Target state : debug mode
Debug entry cause : trace
Current PC : 0x005ba8e8
BDI>md 0x005ba8e8
005ba8e8 : 00000000 00000000 00000000 00000000 ................
005ba8f8 : 00000000 00000000 00000000 00000000 ................
005ba908 : 00000000 00000000 00000000 00000000 ................
005ba918 : 00000000 00000000 00000000 00000000 ................
005ba928 : 00000000 00000000 00000000 00000000 ................
...
BDI>go
- TARGET: stopped
BDI>i
Target state : debug mode
Debug entry cause : software emulation exception
Current PC : 0x005ba8e8
Problem is that flush_instruction_cache (and flush_data_cache)
from boot/common/util.S are not being copied to the relocate section,
even though the file contains the proper entry:
.section ".relocate_code","xa"
/*
* Flush and enable instruction cache
* First, flush the data cache in case it was enabled and may be
* holding instructions for copy back.
*/
_GLOBAL(flush_instruction_cache)
Here is the disassemble of the relocate section:
004047a0 <__relocate_start>:
4047a0: 38 c0 00 00 li r6,0
4047a4: 7c e9 03 a6 mtctr r7
4047a8: 3c 80 00 40 lis r4,64
4047ac: 60 84 00 20 ori r4,r4,32
4047b0: 7d 03 43 78 mr r3,r8
4047b4: 7c 04 18 00 cmpw r4,r3
4047b8: 41 81 00 20 bgt- 4047d8 <do_relocate_from_end>
004047bc <do_relocate_from_start>:
4047bc: 80 a3 00 00 lwz r5,0(r3)
4047c0: 90 a4 00 00 stw r5,0(r4)
4047c4: 38 63 00 04 addi r3,r3,4
4047c8: 38 84 00 04 addi r4,r4,4
4047cc: 7c c6 2a 78 xor r6,r6,r5
4047d0: 42 00 ff ec bdnz+ 4047bc <do_relocate_from_start>
4047d4: 48 00 00 24 b 4047f8 <do_relocate_out>
004047d8 <do_relocate_from_end>:
4047d8: 3c 60 00 5b lis r3,91
4047dc: 60 63 d3 40 ori r3,r3,54080
4047e0: 54 e4 10 3a rlwinm r4,r7,2,0,29
4047e4: 7c 88 22 14 add r4,r8,r4
4047e8: 84 a4 ff fc lwzu r5,-4(r4)
4047ec: 94 a3 ff fc stwu r5,-4(r3)
4047f0: 7c c6 2a 78 xor r6,r6,r5
4047f4: 42 00 ff f4 bdnz+ 4047e8 <do_relocate_from_end+0x10>
004047f8 <do_relocate_out>:
4047f8: 3c 60 00 40 lis r3,64
4047fc: 60 63 01 14 ori r3,r3,276
404800: 7c 68 03 a6 mtlr r3
404804: 4b ff d5 40 b 401d44 <flush_instruction_cache>
Disassembly of section .data:
Replacing "b flush_instruction_cache" with "ba flush_instruction_cache"
makes the system boot.
The problem does not exist on v2.6.14.
Any clues??
