ibook2r2 & strange freeze.

Brice Figureau brice at tincell.com
Sun Apr 27 22:39:22 EST 2003

On Sunday, April 27, 2003, at 01:14 AM, Benjamin Herrenschmidt wrote:
>>> Ah, that's a machine check... interesting. So either the address
>>> above
>>> is bogus, or the card is crashed. In this later case, noaccel should
>>> have helped, except if, for some reason, the argument was ignored
>>> when setting the initial mode...
>> Since the address does not seem to be bogus, could it be possible that
>> my computer is broken in a certain way ? (bad memory...).
>> I'll do another noaccel check.
> Well, it's weird... It seems the ATI chip isn't anwsering on the bus on
> a specific access.
> Are you sure of that specific bit of disassembly ?
> c0184554 380b0e40 addi  r0,r11,3640
> Is't it 3648 instead ? (the opcode seem to indicate that). In this
> case,
> the problem is that we are getting a machine check in
> radeon_fifo_wait()
> while reading RBBM_STATUS register.
You were right, that was 3648, it was late yesterday when I copied

> I have absolutely no idea what can cause this (but bad HW ?) in xmon,
> if you first check out r0 (it may not be d9000000 again ...) and then
> do "m d9000000.l" (or replace d9000000 by whatever it has become) and
> finally tell me if you atually read a value or not.
The address seems to exists (and it didn't change):
m d9000000.l gave:
I don't think my hardware is bad since I run macosx and ben8 without
any problem (XFree86 is working fine).

> I completely fail to understand why a problem like this would happen
> with -ben9 and not -ben8. Are you absolutely sure you properly tried
> -ben9 with the radeonfb from -ben8 ?

I'm now sure that the problem does not come from radeonfb !
To proove it, I took -ben8 and backported -ben9 changes one after one
into it, until I got the same crash as before.
It began to crash when I backported:

As I'm not really good at powerpc assembly, I'll let you find exactly
where the problem is ;-)


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