Re: EBDA Question

[H. Peter Anvin]

Followup to:  <91888D455306F94EBD4D168954A9457C01297B87@xxxxxxxxxxxxxxxxxxxx>
By author:    "Moore, Eric Dean" <Eric.Moore@xxxxxxxx>
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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