I've been tasked with porting U-Boot from v1.1.5 to v2013.01 for a custom
board based off PPC460SX (AMCC Eiger board which is no longer supported).
I'm trying to understand what's going on with my current setup. I'm able to
load the u-boot.bin and can see that it's in the correct address location.
But I'm running into problems when trying to debug using gdb.
After I telnet to my BDI2000, I can reset and see that I'm moving memory
locations with "ti" like so:
rare>i
Core number : 0
Core state : debug mode
Debug entry cause : JTAG stop request
Current PC : 0xfffffffc
Current CR : 0x82ca2e28
Current MSR : 0x00000000
Current LR : 0xfffff18c
rare>ti
Core number : 0
Core state : debug mode
Debug entry cause : single step
Current PC : 0xfffff000
Current CR : 0x82ca2e28
Current MSR : 0x00000000
Current LR : 0xfffff18c
rare>ti
Core number : 0
Core state : debug mode
Debug entry cause : single step
Current PC : 0xfffff004
Current CR : 0x82ca2e28
Current MSR : 0x00000000
Current LR : 0xfffff18c
rare>ti
Core number : 0
Core state : debug mode
Debug entry cause : single step
Current PC : 0xfffff008
Current CR : 0x82ca2e28
Current MSR : 0x00000000
Current LR : 0xfffff18c
rare>
On the BDI, I've build gdb for the powerpc and added -ggdb as well as
-fno-schedule-insns -fno_schedule-insns2 #omit-frame-pointer -g to config.mk.
>From gdb I run the following:
1. >dir/powerpc-440-linux-gnu-gdb
2. (gdb) set arch powerpc:common
3. (gdb) file u-boot
4. (gdb) target remote ipaddr:2001
(reset via BDI)
5. s or si
My initial step through will get me to "tlbtab_start" in board/dir/init.S.
and fail like this:
tlbnxt () at start.S:483
483 tlbnxt: addi r4,r4,1 /* Next TLB */
(gdb) s
484 bdnz rsttlb
(gdb) s
504 bl tlbtab /* Get tlbtab pointer */
(gdb) s
Cannot access memory at address 0x3f
(gdb) s
tlbtab () at init.S:43
43 tlbtab_start
Cannot access memory at address 0xfffff1f8
If I reset via BDI and step through again I'll receive the "Cannot access
memory at address " at what seems to be random spots.
I'm new to software development, especially at such a low level. Any advice
you may have would be greatly appreciated, I feel like I'm just spinning my
wheels at this point.
Thanks,
Greg
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