From: Geoff Levand <geoff@infradead.org>
To: Michael Ellerman <michael@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: [Cbe-oss-dev] [PATCH 05/10] powerpc/ps3: Use highmem region from repository
Date: Wed, 13 Jun 2012 10:58:44 -0700 [thread overview]
Message-ID: <1339610324.3986.6.camel@clam> (raw)
In-Reply-To: <1339552163.25512.2.camel@concordia>
Hi Michael,
On Wed, 2012-06-13 at 11:49 +1000, Michael Ellerman wrote:
> On Wed, 2012-04-25 at 19:19 +0000, Andre Heider wrote:
> > Use any preallocated highmem region setup by the bootloader.
> > This implementation only checks for the existance of a single
> > region at region_index=0.
> >
> > This feature allows the bootloader to preallocate highmem
> > regions and pass the region locations to the kernel through
> > the repository. Preallocated regions can be used to hold the
> > initrd or other large data. If no region info exists, the
> > kernel retains the old behavior and attempts to allocate the
> > highmem region itself.
> >
> > Based on Hector Martin's patch "Get lv1 high memory region from
> > devtree".
>
> Apologies if this has been covered before, but why not use the device
> tree?
FreeBSD (and other OS's) don't know about the Linux device tree.
This mechanism is for the bootloader to tell the OS about a highmem
region it setup, and we want to support more than just Linux.
-Geoff
next prev parent reply other threads:[~2012-06-13 17:58 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-25 19:19 [GIT PULL] PS3 updates for Linux-3.5 Geoff Levand
2012-04-25 19:19 ` [PATCH 04/10] powerpc/ps3: Add highmem repository read routines Andre Heider
2012-04-25 19:19 ` [PATCH 05/10] powerpc/ps3: Use highmem region from repository Andre Heider
2012-06-13 1:49 ` [Cbe-oss-dev] " Michael Ellerman
2012-06-13 17:58 ` Geoff Levand [this message]
2012-06-13 18:25 ` Nathan Whitehorn
2012-04-25 19:19 ` [PATCH 03/10] powerpc/ps3: Add highmem repository write routines Geoff Levand
2012-04-25 19:19 ` [PATCH 01/10] powerpc/ps3: Correct lv1 repository routine names Geoff Levand
2012-04-25 19:19 ` [PATCH 06/10] powerpc/ps3: Add highmem region memory early Hector Martin
2012-04-25 19:19 ` [PATCH 02/10] powerpc/ps3: Add PS3 repository write support Geoff Levand
2012-04-25 19:19 ` [PATCH 10/10] powerpc/ps3: Refresh ps3_defconfig Geoff Levand
2012-04-25 19:19 ` [PATCH 09/10] drivers/ps3: Fix checkpatch warnings in ps3av.c Valentin Ilie
2012-04-25 19:19 ` [PATCH 07/10] powerpc/ps3: Remove MEMORY_HOTPLUG requirement Andre Heider
2012-04-25 19:19 ` [PATCH 08/10] powerpc/ps3: Minor Kconfig cleanup Geoff Levand
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