Re: 2.2.16 SMP: mtrr errors

Alan Cox
2000-12-12T21:53:16Z

> Petr, the Matrox card splits the memory between the two video screens
> when running in a multi-head configuration and "pretends" that it is two
> distinct cards. Thus, a 32 mb card will register an mtrr for 24mb and
> for 8mb seperately when in this mode.

That is a driver bug. The intel processors only support MTRR's on certain
power boundaries/sizes. The fall through is intended.

> to fall through, but is this correct? I've inserted a break at the end
> of the Intel switch before and have not had problems, but I left it out

Lucky

> in the latest couple of kernels because of all the mtrr work being done,
> waiting to see if there was resolution.

The Matrox driver needs to register a single 32Mb MTRR