[U-Boot-Users] TEXT_BASE question

[robert lazarski]

On 9/27/07, Swarthout Edward L-SWARTHOU <ed.swarthout at freescale.com> wrote:
> From: robert lazarski
> >
> > ATUM>rd ivor15
> > ivor15         : 0x00000f00  3840
> >
> > That seems out of range of my 4K stack before relocation, could that
> > be a problem or am I simply reading this wrong?
>
> Check ivpr, they work together.
>
> It is only used for the debugger - so it only has to point to a
> fetchable memory location so the cpu can halt under debugger control.
>
> -ELS
>
>

Indeed, one of my problems is that the bdi is giving me a 'core is
stopped' while debugging - a clear indication of a problem reading
ivor15. My understanding is that on 85xx, special 63 is ivpr and
ivor15 is 415. When I set a breakpoint early in the u-boot code, yet
after those registers have been initialized and before my TLB's crash,
I get:

ATUM>rdspr 415
SPR  415 : 0x00000f00         3840
ATUM>rdspr 63
SPR   63 : 0xfff80000  -    524288

0xfff80000 + f00 == 0xfff80f00 . In the bdi config I have tried:

WSPR    63          0xfff80000
WSPR    415         0x00000f00

Yet I still get 'core is stopped' while debugging. I may be lacking a
L2 entry of some sort. L2CAM shows:

ATUM>l2cam 0 0xf
IDX  PID      EPN  SIZE V TS           RPN U0-U3 WIMGE UUUSSS
  0 : 00 fffff000   4KB V  0 -> 0_fffff000  0000 -I--- ---RWX
  1 : 00 00000000   1KB -  0 -> 0_00000000  0000 ----- ------
  2 : 00 00000000   1KB -  0 -> 0_00000000  0000 ----- ------
  3 : 00 00000000   1KB -  0 -> 0_00000000  0000 ----- ------
  4 : 00 00000000   1KB -  0 -> 0_00000000  0000 ----- ------
  5 : 00 00000000   1KB -  0 -> 0_00000000  0000 ----- ------
  6 : 00 00000000   1KB -  0 -> 0_00000000  0000 ----- ------
  7 : 00 00000000   1KB -  0 -> 0_00000000  0000 ----- ------
  8 : 00 00000000   1KB -  0 -> 0_00000000  0000 ----- ------
  9 : 00 00000000   1KB -  0 -> 0_00000000  0000 ----- ------
 10 : 00 00000000   1KB -  0 -> 0_00000000  0000 ----- ------
 11 : 00 00000000   1KB -  0 -> 0_00000000  0000 ----- ------
 12 : 00 00000000   1KB -  0 -> 0_00000000  0000 ----- ------
 13 : 00 00000000   1KB -  0 -> 0_00000000  0000 ----- ------
 14 : 00 00000000   1KB -  0 -> 0_00000000  0000 ----- ------
 15 : 00 00000000   1KB -  0 -> 0_00000000  0000 ----- ------

If I get debugging working it may be a critical piece in finding my
problems. Any ideas on what is preventing me from debugging? Thanks!
Robert