Re: [PATCH] [v3] powerpc/4xx: work around CHIP11 errata in a more PAGE_SIZE-friendly way

[Hollis Blanchard <hollisb@us.ibm.com>]

On Fri, 2008-11-14 at 16:09 -0600, Hollis Blanchard wrote:
> 
> Basically my revised proposal is to add explicit memory reservation properties 
> to the device tree. Currently, "/memreserve" properties in .dts files are not 
> present in the device tree itself, only in the FDT header. I think these 
> reservations should be duplicated in the tree itself, so that they become 
> visible to post-boot tools like kexec.
> 
> In summary, all memory reservations will then exist both in the device tree 
> and in the FDT header. Comments?
> 
> Impact to uboot: revert memory node truncation; create reservation 
> and /memreserve property.
> 
> Impact to cuboot wrapper: revert memory node truncation; create reservation 
> and /memreserve property.
> 
> Impact to kernel: none. /memreserve will be ignored, since memory reservations 
> are already handled properly.
> 
> Impact to kexec-tools: Must take /memreserve into account when placing data 
> at "the end of memory".
> 
> If this is all too much, then I'm close to giving up and burning a 64KB page, 
> which requires only ALIGN_DOWN() in the kernel.

Any comments?

-- 
Hollis Blanchard
IBM Linux Technology Center