Re: [coreboot] earliest running code with qemu

[Carl-Daniel Hailfinger]

Am 13.08.2014 07:05 schrieb ron minnich:
> I'm sure it could run were someone to implement it.

A few years ago, I implemented partial MTRR support in Qemu. To be
exact, I added support for not throwing away the MTRR contents after a
write and now you can actually read the MTRRs after writing. That said,
you'd have to add real MTRR handling to get CAR (cache-as-RAM) to work
in Qemu. I once had some half-finished patches, but that was before Qemu
used QOM. It might be possible to salvage these half-finished patches
once I dig up my old hard drive. The mechanics of implementing CAR are a
bit tricky, but I think overall maybe 200 lines of code should suffice.
If you're still interested, tell me and I'll try to dig up my old patch
over the next few weeks (old hard drive is in a pile, and I don't know
which one has that patch).

Regards,
Carl-Daniel

earliest running code with qemu

[John de la Garza]

On Wed, Aug 13, 2014 at 09:23:13AM +0200, Carl-Daniel Hailfinger wrote:
> The mechanics of implementing CAR are a
> bit tricky, but I think overall maybe 200 lines of code should suffice.
> If you're still interested, tell me and I'll try to dig up my old patch
> over the next few weeks (old hard drive is in a pile, and I don't know
> which one has that patch).

I was just curious, I have almost no experience in this type of
thing and am trying to learn more about low level programming.  I
don't want to create work for you.  Thanks for the offer.