To: linux-kernel@vger.kernel.org
From: hpa@zytor.com (H. Peter Anvin)
Subject: Re: EBDA Question
Date: Tue, 8 Feb 2005 23:28:05 +0000 (UTC)
Organization: Mostly alphabetical, except Q, which We do not fancy
Message-ID: <cubhu5$3jf$1@terminus.zytor.com>
References: <91888D455306F94EBD4D168954A9457C01297B87@nacos172.co.lsil.com>
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Followup to:  <91888D455306F94EBD4D168954A9457C01297B87@nacos172.co.lsil.com>
By author:    "Moore, Eric Dean" <Eric.Moore@lsil.com>
In newsgroup: linux.dev.kernel
>
> EBDA - Extended Bios Data Area
> 
> Does Linux and various boot loaders(lilo/grub/etc)
> having any restrictions on where and how big 
> memory allocated in EBDA is? Is this
> handled for 2.4/2.6 Kernels?
> 
> Reason I ask is we are considering having
> BIOS(for a SCSI HBA Controller) allocating
> memory in EBDA for Firmware use. 
> We are concerned whether Linux would be writing
> over this region of memory during the handoff
> of BIOS to scsi lower layer driver loading.
> 

In general, dropping the EBDA below 0x9a000 is probably a
bad idea.  Recent Linux kernels and boot loaders should handle it,
though.  Keep in mind that you might find yourself in serious trouble
if you then have, for example, a PXE stack layered on top of your SCSI
BIOS.

	-hpa

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