* Strange writings at 0x0
@ 2002-04-30 14:18 Jakob Jepsen
2002-04-30 17:07 ` Magnus Damm
0 siblings, 1 reply; 2+ messages in thread
From: Jakob Jepsen @ 2002-04-30 14:18 UTC (permalink / raw)
To: linuxppc-embedded
Hi
When tracking a bug in our own code we stumbled over some strange
writings to addr 0x0.
The pattern :
00000000 : 55 00 30 55 01 30 5e 80 00 00 00 00 00 00 00 00
are written continuously to memory.
The writings have in them self no effect, but must be considered a bad
sign.
We are running on a MPC857T rev. A BETA running at 50 MHZ.
Linux version 2.4.4 from Denx
Have anybody seen something like this or have anybody an idea to where
the data are
coming from. (The CPM is a sure guess, but what are generating it ?)
Thanks.
Jakob
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Strange writings at 0x0
2002-04-30 14:18 Strange writings at 0x0 Jakob Jepsen
@ 2002-04-30 17:07 ` Magnus Damm
0 siblings, 0 replies; 2+ messages in thread
From: Magnus Damm @ 2002-04-30 17:07 UTC (permalink / raw)
To: Jakob Jepsen; +Cc: linuxppc-embedded
I think the file arch/ppc/kernel/head_8xx.S
saves stuff on address 0 in the tlb handler.
(line 361 on 2002-03-21)
/ magnus
Jakob Jepsen wrote:
>
> Hi
>
> When tracking a bug in our own code we stumbled over some strange
> writings to addr 0x0.
>
> The pattern :
>
> 00000000 : 55 00 30 55 01 30 5e 80 00 00 00 00 00 00 00 00
>
> are written continuously to memory.
>
> The writings have in them self no effect, but must be considered a bad
> sign.
>
> We are running on a MPC857T rev. A BETA running at 50 MHZ.
> Linux version 2.4.4 from Denx
>
> Have anybody seen something like this or have anybody an idea to where
> the data are
> coming from. (The CPM is a sure guess, but what are generating it ?)
>
> Thanks.
>
> Jakob
>
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
^ permalink raw reply [flat|nested] 2+ messages in thread
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