Re: How to debug 2.6 PReP boot hang?
From: Tom Rini (trini_at_kernel.crashing.org)
Date: 09/01/04
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Date: Wed, 1 Sep 2004 10:27:51 -0700 To: Meelis Roos <mroos@linux.ee>
On Wed, Aug 18, 2004 at 11:29:02PM +0300, Meelis Roos wrote:
> > > It's the one that reorganizes boot code:
> > > PPC32: Kill off arch/ppc/boot/prep and rearrange some files.
> >
> > Sadly, that is what I expected. Try narrowing down the differences
> > between prep/head.S and simple/head.S (or rather head.s via make
> > arch/ppc/boot/prep/head.s and simple/head.s to strip out comments, etc).
[snip]
> Some more changes and the only difference is load_kernel vs
> decompress_kernel. Changing load_kernel call in relocate.S to
> decompress_kernel makes the kernel boot. Oh, finally.
>
> BTW, the address of OF residual data bounces around in
> r3->r29->r4->r11->r6. The old code only did r3->r11->r6 but the new code
> uses r11 for cache disabling.
>
> This is the patch I'm using currently. I understand that this is
> probably not the right patch for inclusion :)
>
> ===== arch/ppc/boot/simple/relocate.S 1.11 vs edited =====
> --- 1.11/arch/ppc/boot/simple/relocate.S 2004-04-03 06:13:47 +03:00
> +++ edited/arch/ppc/boot/simple/relocate.S 2004-08-18 23:27:39 +03:00
> @@ -183,7 +183,7 @@
> mr r5,r6 /* Checksum */
> mr r6,r11 /* Residual data */
> mr r7,r25 /* Validated OFW interface */
> - bl load_kernel
> + bl decompress_kernel
>
> /*
> * Make sure the kernel knows we don't have things set in
Interesting.. Can you do some nm'ing to see what versions of
load_kernel / decompress_kernel end up in your image on a stock config?
And what gcc / binutils versions are you using?
-- Tom Rini http://gate.crashing.org/~trini/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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