linux-kernel - Re: [PATCH v2] powerpc32: Kexec support for PPC440X chipsets

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Date:	Mon, 18 Jul 2011 09:34:59 +0530
From:	Suzuki Poulose <suzuki@...ibm.com>
To:	Benjammin Herrenschmidt <benh@...nel.crashing.org>,
	Kumar Gala <galak@...nel.crashing.org>
CC:	"Suzuki K. Poulose" <suzuki@...ibm.com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	kexec <kexec@...ts.infradead.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Josh Boyer <jwboyer@...ux.vnet.ibm.com>,
	Paul Mackerras <paulus@...ba.org>,
	linux ppc dev <linuxppc-dev@...ts.ozlabs.org>,
	Vivek Goyal <vgoyal@...hat.com>,
	Michal Simek <monstr@...str.eu>
Subject: Re: [PATCH v2] powerpc32: Kexec support for PPC440X chipsets

On 07/12/11 12:14, Suzuki K. Poulose wrote:
> Changes from V1: Uses a tmp mapping in the other address space to setup
> 		 the 1:1 mapping (suggested by Sebastian Andrzej Siewior).
>
> Note: Should we do the same for kernel entry code for PPC44x ?
>
> This patch adds kexec support for PPC440 based chipsets.This work is based
> on the KEXEC patches for FSL BookE.
>
> The FSL BookE patch and the code flow could be found at the link below:
>
> 	http://patchwork.ozlabs.org/patch/49359/
>
> Steps:
>
> 1) Invalidate all the TLB entries except the one this code is run from
> 2) Create a tmp mapping for our code in the other address space and jump to it
> 3) Invalidate the entry we used
> 4) Create a 1:1 mapping for 0-2GiB in blocks of 256M
> 5) Jump to the new 1:1 mapping and invalidate the tmp mapping
>
> I have tested this patches on Ebony, Sequoia boards and Virtex on QEMU.
> It would be great if somebody could test this on the other boards.

Forgot to mention:

You would need the current snapshot of kexec-tools, available at

git://git.kernel.org/pub/scm/utils/kernel/kexec/kexec-tools.git

The following commits(in the current tree) are needed for the support of ppc32.


commit 13f6d71bdf9836b90ae4ec21209383f1a3c56b0f
kexec-tools: ppc32: Fixup ThreadPointer for purgatory code

commit 9ec3fac7e8840fb31891ba49a626c5dd33e09e86
kexec-tools: powerpc: Use the #address-cells information to parsememory/reg

commit 806ef8870539a6c74a2a98188d0207a038b16f77
Fix memory errors on ppc


Thanks

Suzuki
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