Re: [PATCH v2 1/3] x86, boot: add mmio serial during compressed boot

[H. Peter Anvin]

On 07/12/2013 11:47 PM, Yinghai Lu wrote:
> 
> for 32 bit, that is ok.
> for 64 bit via 32bit bootloader, arch/x86/boot/compressed/head_64.S
> will set page table for first 4G still ok.
> for 64 bit via 64bit loader, like kexec via bzImage64, First Kernel/Kexec only
> set ident mapping for usable range, so mmio just under 64 is not mapped.
> 
> Looks like we need to update boot.txt to add requirement for 64bit bootloader
> that 0-4G need to be all ident mapping?
> 

I think that is an unrealistic requirement, especially if this is the
sole user.

	-hpa


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