Re: [PATCH] Use todc on Mot PReP platforms

On Wed, Aug 10, 2005 at 09:37:35AM -0700, Matt Porter wrote:

This restores behavior from 2.4 where PReP platforms identified
as Motorola would calibrate the decrementer using the RTC. On
real Motorola PReP hardware this isn't needed. However, in order
to boot a stock 2.6 PReP kernel on qemu (which emulates a Motorola
PReP system) it is necessary to allow it to calibrate the decrementer
using an emulated RTC.  If the decrementer rate is read from
residual data then timing is screwed since a qemu PReP system typically
runs much faster than the original hardware.

If anybody has objections to this as the default, let me know. It
still works (as did 2.4) on a couple of my Mot PReP boxes and doesn't
affect the IBM PReP paths. My goal with this is to be able to run
a stock 2.6 defconfig PReP build on qemu.

So, I like this, and not just because I'm playing with qemu as well.
Leigh, can you run this on any 'interesting' PReP you've got that might
tickle a bug here?  Thanks.

-- 
Tom Rini
http://gate.crashing.org/~trini/