----- Original Message -----
From: "ARIBAUD Albert" <[EMAIL PROTECTED]>
To: <linuxppc-embedded at lists.linuxppc.org>
Sent: Friday, October 03, 2003 3:57 PM
Subject: RE: Queston about Walnut
>
> (disclaimer : I work on 8xx, not 4xx)
>
> I would suggest inspecting the timings for memory access.
> If this is SDRAM, you must have had to program the UPM for
> it, I suppose. Might be that VxWorks has it right, and you
> have set it up differently.
>
> Also, writing to address 0 might be a Bad Ideam (tm), if you
> have set this area to hold interrupt vectors.
>
> Did you try single write (say, "mw 100000 0") ?
Thanks for you suggestion. Not only single write, I can now write to
anywhere except the first 1MB of SDRAM. I think it is occupied by u-boot?
So, I think memory is ok now.
Do you have any idea it hangs at __sti()?
mfmsr r3 /* Get current state */
ori r3,r3,MSR_EE /* Turn on 'EE' bit */
SYNC /* Some chip revs have problems here... */
mtmsr r3 <------Hangs after executing it /* Update
machine state */
blr
Is there any relationship with the previous instruction "SYNC"? What
revision will have problem there?
Thanks.
>
> Albert.
>
> P.S. I think that if you write directly to linuxppc-embedded,
> Wolfgang will cease receiving you mails twice (which he probably
> does now since you e-mail him *and* CC: to the list).
Thanks for remind me. I will be careful next time.
Best regards,
Jacky
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