[syslinux] Modify memdisk to mask/overlay start of hard drive

[H. Peter Anvin]

On 10/21/2011 08:37 PM, Erik Jensen wrote:
> I have a somewhat unique problem I am trying to solve that requires me
> to temporarily replace the first 63s of the main hard drive and boot
> the result. Basically, I am hoping it is possible to modify memdisk to
> serve requests for the first 63 sectors from a ram disk and pass other
> requests through to the hard drive. There will never be a read
> spanning the two, so I don't need it to be able to handle that
> complexity. Also, it will alway be masking the first 63s of the first
> hard drive, so it doesn't need to be configurable.
>
> How complicated would it be to modify memdisk to support this? Any
> advice on where to make the change? I do have some programming
> experience, but none in assembly.
>

It would be worthwhile, perhaps, to describe your use case.

	-hpa