linux-kernel - Re: [PATCH] x86_64: early memtest to find bad ram

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Message-ID: <86802c440803221421s77c710bev91105d4b45baa8a6@mail.gmail.com>
Date:	Sat, 22 Mar 2008 14:21:05 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Arjan van de Ven" <arjan@...radead.org>
Cc:	yhlu.kernel.send@...il.com,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Ingo Molnar" <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	"kernel list" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86_64: early memtest to find bad ram

On Sat, Mar 22, 2008 at 1:48 PM, Arjan van de Ven <arjan@...radead.org> wrote:
> On Thu, 20 Mar 2008 23:58:33 -0700
>
> Yinghai Lu <yhlu.kernel.send@...il.com> wrote:
>
>  >
>
> > do simple memtest after init_memory_mapping
>  >
>  > use find_e820_area_size to find all ram range that is not reserved.
>
>  be careful, there's some special memory that e820 right now says is not reserved,
>  but still has bios data (the first 4Kb of memory come to mind)
only test ranges that have E820_RAM and exclude range that is early_reserved...
so it is safe.

YH
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