[PATCH 2/2] arm64: Pass RAM boundary and enable-dcache flag to purgatory

[dyoung@redhat.com (Dave Young)]

On 11/23/16 at 07:16am, Pratyush Anand wrote:
> Hi Geoff,
> 
> On Wednesday 23 November 2016 12:27 AM, Geoff Levand wrote:
> > Hi Pratyush,
> > 
> > On 11/21/2016 08:32 PM, Pratyush Anand wrote:
> > > When "enable-dcache" is passed to the kexec() command line, kexec-tools
> > > passes this information to purgatory, which in turn enables cache during
> > > sha-256 verification.
> > 
> > What's the point of this enable-dcache option?  Why not just
> > always enable the cache if we can?
> 
> As I have written in changelog of patch 1/2
> 
> "We are supporting only 4K and 64K page sizes. This code will not work if a
> hardware is not supporting at least one of these page sizes.  Therefore,
> D-cache is disabled by default and enabled only when "enable-dcache" is
> passed to the kexec()."
> 
> 
> Although this is very unlikely that a hardware will support only 16K page
> sizes, however it is possible. Therefore, its better to keep it disabled by
> default.

If it is *unlikely* it could be better to make it as default and add a
--disable-dcache instead.

> 
> ~Pratyush
> 
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Thanks
Dave