On Thu, Apr 05, 2001 at 08:28:06 +0400, Valeriy E. Ushakov wrote:

> The kernel crashes after jump to startmap_done (it lands in the middle
> of the Forth code as dump seems to suggest).  Guess MMU needs
> different approach.
> 
> ENOCLUE.

Sometimes it triggers watchdog reset, sometimes it prints
"CP Disabled" and falls into OBP prompt.  Below is a sample trace.
Any ideas?


! right before we do the remap

ok %pc dis      
7184     sta         %l4, [%o1]20
7188     sethi       f0007000, %g1	! startmap_done:
718c     or          %g1, 198, %g1
7190     jmp         %g1, %g0, %g0
7194     sethi       0, %g0

ok f0007000 map?
Virtual  : f000.7000 
Context  : @ 0.03ff.f000  003f.eec1 # 0 
Region   : @ 0.03fe.efc0  003f.eeb1 
Segment  : @ 0.03fe.eb00  003f.eea1 
Page     : @ 0.03fe.ea1c  003f.c1fe Cached Modified Referenced Access : rwx---
Physical : 0.03fc.1000  

ok step					! do the remap
7188     sethi       f0007000, %g1

ok f0007000 map?
Virtual  : f000.7000 
Context  : @ 0.03ff.f000  003f.eec1 # 0 
Region   : @ 0.03fe.efc0  003f.ee81 
Segment  : @ 0.03fe.e800  003f.ee71 
Page     : @ 0.03fe.e71c  0000.07fe Cached Modified Referenced Access : rwx---
Physical : 0.0000.7000  

ok 7000 map?
Virtual  : 0000.7000 
Context  : @ 0.03ff.f000  003f.eec1 # 0 
Region   : @ 0.03fe.ec00  003f.ee81 
Segment  : @ 0.03fe.e800  003f.ee71 
Page     : @ 0.03fe.e71c  0000.07fe Cached Modified Referenced Access : rwx---
Physical : 0.0000.7000  

ok step

Watchdog Reset

%PSR 0400.1fc4
%TBR f000.0020
%PC  f000.0020
%nPC f000.0024

[... reboot ...]
[... kernel is loaded and then...]
CP Disabled
ok %pc
ok .s
f0007198				! the 1f local label in startmap_done
ok %pc .

Watchdog Reset

%PSR 0400.1fc4
%TBR f000.0020
%PC  f000.0020
%nPC f000.0024


SY, Uwe
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