On 06/13/12 12:58, Geoff Levand wrote:
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
FreeBSD actually does have FDT support -- it's just not used for the PS3
platform at the moment since it is (currently) totally redundant with
the HV repository. If people decide that FDT has an advantage, FreeBSD
at least can easily be adapted to use it.
-Nathan
_______________________________________________
Linuxppc-dev mailing list
Linuxppc-dev@lists.ozlabs.org
https://lists.ozlabs.org/listinfo/linuxppc-dev
