Re: [PATCH] x86: only load initrd above 4g on second try

[H. Peter Anvin]

On 08/26/2014 03:05 PM, Yinghai Lu wrote:
> 
> The firmware has bug and can use buffer above 4G to read files.
> and if the file size is 512 bytes alignment, then reading could go through.
> 

File size, or alignment?  Different things.  Again, your patch
description is not just incomplete, but seems to be actively misleading.

This does, however, suggest at least two possible solutions:

1. We can read the initramfs into a temporary buffer and memcpy() it to
the target.

2. We might be able to align the initramfs buffer to a 512-byte section
and then round up the size.

The 512 bytes here is probably a hardware sector, I'm not sure how this
will play on 4K-hard-sectored media, although those are few and far between.

	-hpa

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