linux-kernel - Re: [PATCH] x86, eboot: Support initrd loaded above 4G

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Message-ID: <CAE9FiQVP6d5GhFBBmX5HDo0w0oKJSizdKvepq5t6vhGNj=W9sg@mail.gmail.com>
Date:	Thu, 10 Jul 2014 11:00:06 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Matt Fleming <matt@...sole-pimps.org>
Cc:	Matt Fleming <matt.fleming@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
	linux-efi@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86, eboot: Support initrd loaded above 4G

On Wed, Jul 9, 2014 at 11:26 AM, Matt Fleming <matt@...sole-pimps.org> wrote:
> On Wed, 18 Jun, at 03:28:19PM, Matt Fleming wrote:
>> On Sat, 14 Jun, at 12:23:41PM, Yinghai Lu wrote:
>> > For boot efi kernel directly without bootloader.
>> > If the kernel support XLF_CAN_BE_LOADED_ABOVE_4G, we should
>> > not limit initrd under hdr->initrd_add_max.
>
> Well, fooey. This patch breaks one of my ASUS machines. It appears some
> firmware implementations exhibit issues reading directly into a buffer
> above the 4GB mark.
>
> I haven't diagnosed exactly what goes wrong with the buffer (i.e. in
> what way it becomes corrupt), but I should really do that before
> thinking of how to fix this.
>
> I'll keep you posted, I just wanted to give you a heads up that things
> are screwy in this area.

Oh, no.

so efi could allocate buffer above 4g but can not access it?

Yinghai
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