[Cbe-oss-dev] [PATCH 05/10] powerpc/ps3: Use highmem region from repository
geoff at infradead.org
Thu Jun 14 03:58:44 EST 2012
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
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.
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