[U-Boot-Users] Using DCACHE instead of internal SRAM as the initial stack on PPC440GP?
Shawn Jin
shawnxjin at gmail.com
Mon Mar 7 18:44:51 CET 2005
> > (gdb) mon tlb 0 8
> > 0 : 00 f0000000 256MB V0 -> 1_f0000000 U:0000 -I-G- XWRXWR
> > 1 : 00 e0000000 256MB V0 -> 1_40000000 U:0000 -I-G- -WR-WR
> > 2 : 00 40000000 4KB V0 -> 1_4f000000 U:0000 ----- XWRXWR
>
> Tlb 1 and 2 seem to overlap in the physical addresses!
Now I changed the page size to 4K in tlb 1. Here is the new tlb.
Core#0>tlb 0 8
0 : 00 f0000000 256MB V0 -> 1_f0000000 U:0000 -I-G- XWRXWR
1 : 00 e0000000 4KB V0 -> 1_40000000 U:0000 -I-G- -WR-WR
2 : 00 40000000 4KB V0 -> 1_4f000000 U:0000 ----- XWRXWR
3 : 00 00000000 256MB V0 -> 0_00000000 U:0000 -I-G- XWRXWR
4 : 00 d0000000 256MB V0 -> 2_00000000 U:0000 -I-G- -WR-WR
5 : 00 80000000 256MB V0 -> 3_00000000 U:0000 -I-G- -WR-WR
6 : 00 00000000 1KB -0 -> 0_00000000 U:0000 ----- ------
> > addi r4, 0, PBxCR
> > mtdcr ebccfga, r4
> > lis r4, 0x4F01 /* BAS=0x4F0, BS=000 (1MB) */
> > ori r4, r4, 0xE000 /* BU=11 (r/w), BW=11 (32 bits) */
>
> You don't set BW to 11 but to 10. Please use 0x4f01f000 for the PBxCR value. I
^^^^^^^^^^^
You really meant 0x4f01a000, didn't you? (set BW to 10).
> don't think this is the cause for the problem, but it can't hurt to correct
> this.
This doesn't seem to be the cause of the problem. :(
> Did you take a look at the error reporting registers (for example EBC0_BEAR /
> EBC0_BESR)?
I checked both registers. They are all 0s. Here is the debugging
screen dump. PC 0xfff80180 is the first instruction of stwu.
li r0,0
stwu r0,-4(r1)
stwu r0,-4(r1) /* Terminate call chain */
Core#0>ti
Core number : 0
Core state : debug mode
Debug entry cause : single step
Current PC : 0xfff80180
Current CR : 0x22ffdff7
Current MSR : 0x00021000
Current LR : 0xfffff174
Core#0>rd ebc0_besr
ebc0_besr: 0x00000000 0
Core#0>ti
Core number : 0
Core state : debug mode
Debug entry cause : single step
Current PC : 0x00001400
Current CR : 0x22ffdff7
Current MSR : 0x00021000
Current LR : 0xfffff174
Core#0>rd ebc0_besr
ebc0_besr: 0x00000000 0
Thanks,
-Shawn.
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