[U-Boot-Users] u-boot fails at cpu_init_f
shangway
shangway at yahoo.com
Tue May 9 04:58:19 CEST 2006
Hi all,
I'm trying to get u-boot to run on a proprietary 8540
based board. The board is similar to the MPC8540ADS
which configuration I used to build u-boot. I am using
eldk 4.0. I managed to download u-boot to flash, but I
am unable to run it. By stepping through the code, I
found that it fails in the first c-function
"cpu_init_f".
This is the assembly code for cpu_init_f:
fff82e10 <cpu_init_f>:
fff82e10: 94 21 ff f0 stwu r1,-16(r1)
fff82e14: 3c 60 e4 01 lis r3,-7167
fff82e18: 7c 08 02 a6 mflr r0
fff82e1c: 60 63 3f 80 ori r3,r3,16256
fff82e20: 38 80 00 00 li r4,0
fff82e24: 38 a0 00 30 li r5,48
fff82e28: 90 01 00 14 stw r0,20(r1)
fff82e2c: 48 00 59 b1 bl fff887dc <memset>
fff82e30: 3c 00 ff 00 lis r0,-256
fff82e34: 3d 20 e0 00 lis r9,-8192
fff82e38: 60 00 18 01 ori r0,r0,6145
fff82e3c: 3d 60 ff 00 lis r11,-256
fff82e40: 90 09 50 00 stw r0,20480(r9)
fff82e44: 61 6b 6f f7 ori r11,r11,28663
fff82e48: 38 00 e1 f1 li r0,-7695
fff82e4c: 91 69 50 04 stw r11,20484(r9)
fff82e50: 3d 40 f8 00 lis r10,-2048
fff82e54: 90 09 50 24 stw r0,20516(r9)
fff82e58: 61 4a 08 01 ori r10,r10,2049
fff82e5c: 80 01 00 14 lwz r0,20(r1)
fff82e60: 38 21 00 10 addi r1,r1,16
fff82e64: 91 49 50 20 stw r10,20512(r9)
fff82e68: 7c 08 03 a6 mtlr r0
fff82e6c: 4e 80 00 20 blr
fff82e70: 00 02 86 0c .long 0x2860c
The code runs fine (at least that's what I think)
until 0xfff82e5c. The cpu hangs when I try to execute
that instruction. This is the first time, that there
is a load from an address which is not in flash, so I
suspect, that setting up the cache as RAM failed.
I also tried to manually write data to that location
with gdb, but I read only 0x0.
As this is still in the initialization process of the
cpu, I don't think that it is related to a possibly
wrong board configuration, or am I wrong.
Any ideas?
Thanks in advance and best regards,
Gordon.
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