[PATCH V4 2/3] arm64: support initrd outside kernel linear map

Russell King - ARM Linux linux at arm.linux.org.uk
Thu Oct 8 02:40:55 PDT 2015

On Thu, Oct 08, 2015 at 05:18:14PM +0800, yalin wang wrote:
> is it also possible to implement it on ARM platforms?
> ARM64 platform don’t have HIGH_MEM zone .
> but ARM platform have .
> i remember boot loader must put init rd  into low memory region,
> so if some boot loader put init rd into HIGH men zone
> we can also relocate it to low men region ?
> then boot loader don’t need care about this ,
> and since vmalloc= boot option will change HIGH mem region size,
> if we can relocate init rd , boot loader don’t need care about init rd load address,
> when change vmalloc= boot options .

I'd be more inclined to say yes if the kernel wasn't buggering around
passing virtual addresses (initrd_start) of the initrd image around,
but instead used a physical address.  initrd_start must be a lowmem

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