Hi,
I'm investigating on a strange probklem I have on Assabet and a SA1110
board similar to Assabet :
- when I use bootldr, no problem, the board start well everytime I turn
power on
- when I use redboot, big problem : 1 time out of 20, the board starts
properly. The other times it does nothing. I assume this is not a
hardware problem as bootldr runs fine.
I've run arm-elf-objdump -D on both files and what I get is at the end
of this mail.
My question : in the redboot dump, are the exception handlers properly
mapped and is their content good ?
This doesn't look very clear to me and the content of
.undefined_instruction, .softwxare_interrupt, .abort_prefetch,
.abort_data, .IRQ & .FIq seems strange to me compared to what is in
bootldr and which seems more logical to me.
Many thanks
Eric
*********** redboot :
50000000 <__exception_handlers>:
50000000: e59ff018 ldr pc, [pc, #18] ; 50000020 <vectors>
50000004: e59ff018 ldr pc, [pc, #18] ; 50000024
<.undefined_instruction>
50000008: e59ff018 ldr pc, [pc, #18] ; 50000028
<.software_interrupt>
5000000c: e59ff018 ldr pc, [pc, #18] ; 5000002c
<.abort_prefetch>
50000010: e59ff018 ldr pc, [pc, #18] ; 50000030
<.abort_data>
50000014: 00000000 andeq r0, r0, r0
50000018: e59ff018 ldr pc, [pc, #18] ; 50000038 <.IRQ>
5000001c: e59ff018 ldr pc, [pc, #18] ; 5000003c <.FIQ>
50000020 <vectors>:
50000020: 00000060 andeq r0, r0, r0, rrx
50000024 <.undefined_instruction>:
50000024: 5000037c andpl r0, r0, ip, ror r3
50000028 <.software_interrupt>:
50000028: 50000400 andpl r0, r0, r0, lsl #8
5000002c <.abort_prefetch>:
5000002c: 50000438 andpl r0, r0, r8, lsr r4
50000030 <.abort_data>:
50000030: 500004b4 strplh r0, [r0], -r4
50000034: 00000000 andeq r0, r0, r0
50000038 <.IRQ>:
50000038: 500005bc strplh r0, [r0], -ip
5000003c <.FIQ>:
5000003c: 50000584 andpl r0, r0, r4, lsl #11
Disassembly of section .text:
50000040 <reset_vector>:
50000040: e3a01412 mov r1, #301989888 ; 0x12000000
50000044: e59f26c8 ldr r2, [pc, #6c8] ; 50000714
<_eCos_id+0x14>
50000048: e3822a02 orr r2, r2, #8192 ; 0x2000
5000004c: e3822901 orr r2, r2, #16384 ; 0x4000
50000050: e5812000 str r2, [r1]
************ bootldr :
00000000 <ResetEntryPoint>:
0: ea000095 b 25c <HiReset>
00000004 <UndefEntryPoint>:
4: ea00000b b 38 <HandleUndef>
00000008 <SWIEntryPoint>:
8: ea00001b b 7c <HandleSWI>
0000000c <PrefetchAbortEntryPoint>:
c: ea00002b b c0 <HandlePrefetchAbort>
00000010 <DataAbortEntryPoint>:
10: ea00004b b 144 <HandleDataAbort>
00000014 <NotUsedEntryPoint>:
14: ea000078 b 1fc <HandleNotUsed>
00000018 <IRQEntryPoint>:
18: ea00005a b 188 <HandleIRQ>
0000001c <FIQEntryPoint>:
1c: ea000068 b 1c4 <HandleFIQ>
20: 646c7462 strvsbt r7, [r12], -#1122
24: 00020e0f andeq r0, r2, pc, lsl #28
28: 00000000 andeq r0, r0, r0
2c: 01030004 tsteq r3, r4
30: 00000007 andeq r0, r0, r7
34: 54425341 strplb r5, [r2], -#833
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