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

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Message-ID: <CAE9FiQVE-UyXQOGTwErxRHJSUP0X61eL+x1L6x90=JToG12btw@mail.gmail.com>
Date:	Tue, 26 Aug 2014 15:58:50 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Mantas Mikulėnas <grawity@...il.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Matt Fleming <matt.fleming@...el.com>,
	Ingo Molnar <mingo@...hat.com>,
	Anders Darander <anders@...rgestorm.se>,
	linux-efi@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: only load initrd above 4g on second try

On Tue, Aug 26, 2014 at 3:16 PM, Mantas Mikulėnas <grawity@...il.com> wrote:
>
> In particular, I just realized yesterday that I don't know whether
> it's referring to physical or virtual addresses in the initrd load
> code -- and the laptop only has 4 GB of memory, so the kernel
> shouldn't be using larger physical addresses in the first place.
> (Virtual ones, on the other hand, /would/ mean a weird bug like
> described above.)

When you have 4G ram installed, the mmio could take [3G,4G).
ram range will be [0,3G), [4G, 5G).

Yinghai
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