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From: Geoff Levand <geoff@infradead.org>
To: Michael Ellerman <mpe@ellerman.id.au>
Cc: cbe-oss-dev@lists.ozlabs.org, Andre Heider <a.heider@gmail.com>,
	Hector Martin <hector@marcansoft.com>,
	Nathan Whitehorn <nwhitehorn@freebsd.org>,
	linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH 3/6] powerpc/ps3: Write highmem info to repository
Date: Tue, 13 Jan 2015 10:33:08 -0800	[thread overview]
Message-ID: <1421173988.10001.32.camel@smoke> (raw)
In-Reply-To: <1421118298.26626.2.camel@ellerman.id.au>

Hi Michael,

On Tue, 2015-01-13 at 14:04 +1100, Michael Ellerman wrote:
> On Tue, 2015-01-13 at 01:00 +0000, Geoff Levand wrote:
> > Add calls to the ps3_mm_set_repository_highmem() routine when the ps3
> > r1 highmem region is either created or destroyed.
> 
> What does this actually do? ie. from a user perspective.

It will allow a kexec based bootloader (petitboot for example) to
pre-allocate a highmem region and store things like an initrd or other
large data needed to boot an OS.  With some PS3 configurations the boot
memory region is not large enough to fit all the boot data.

There was ongoing discussion about this on the ML.  Here are two
relevant posts:

https://lists.ozlabs.org/pipermail/linuxppc-dev/2012-April/097691.html
https://lists.ozlabs.org/pipermail/linuxppc-dev/2012-April/097695.html

Here is the very first post which outlines the motivation, etc.:

https://lists.ozlabs.org/pipermail/cbe-oss-dev/2011-August/007420.html

-Geoff

  reply	other threads:[~2015-01-13 18:33 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-13  1:00 [PATCH 0/6] *** SUBJECT HERE *** Geoff Levand
2015-01-13  1:00 ` [PATCH 5/6] powerpc/ps3: Fix sys-manager-core sparse warnings Geoff Levand
2015-01-13  1:00 ` [PATCH 1/6] powerpc/ps3: Add empty repository highmem routines Geoff Levand
2015-01-13  1:00 ` [PATCH 3/6] powerpc/ps3: Write highmem info to repository Geoff Levand
2015-01-13  3:04   ` Michael Ellerman
2015-01-13 18:33     ` Geoff Levand [this message]
2015-01-13  1:00 ` [PATCH 6/6] powerpc/ps3: Update ps3_defconfig Geoff Levand
2015-01-13  1:00 ` [PATCH 4/6] powerpc/ps3: Fix vuart sparse warnings Geoff Levand
2015-01-13  1:00 ` [PATCH 2/6] powerpc/ps3: Add ps3_mm_set_repository_highmem Geoff Levand

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