Problem with 745x errata in 2.6.8

Ken Moffat ken at
Sat Sep 18 19:39:08 EST 2004

On Sat, 18 Sep 2004, Benjamin Herrenschmidt wrote:

> On Sat, 2004-09-18 at 08:03, Ken Moffat wrote:
> > Hi,
> >
> >  I'm trying to get the port to the AmigaOne/Teron into a fit state to
> > attempt to submit it.  I've got it working adequately in 2.6.7 (no ide
> > dma, obviously, and no floppy disk, plus other minor issues) but
> > obviously I need to get it up to the current version before asking for
> > your comments on what needs to be changed to make it acceptable.
> >
> >  Unfortunately, the following changes in 2.6.8-rc3 stop my 7455 from
> > booting (with a vga console, it stops after the console: colour VGA+
> > 80x25 message, and also the top of the screen is blank).  If I revert
> > these, it runs.  I'm totally out of my depth here, I don't even know how
> > to work out which sort of 7455 I've got, much less what this is all
> > doing.  Can anybody offer me some pointers, please ?
> What exact PVR do you have ? It could be your nortbridge not beeing
> properly setup for the kind of snoop cycles issued when the M bit
> is set on all pages ? In this case, it has to be fixed at that level
> (contact AmigaOne/Teron) as I will not revert that fix.

 Ben, thanks for the response.  Until 2 minutes ago I didn't know what
this usage of PVR was, so at the moment I haven't got a clue about what
it contains or how to read it, but I guess that's where the values in
the cpu_sec struct come from so I'll start looking.  Your comment on the
northbridge sounds depressingly likely.

 das eine Mal als Tragödie, das andere Mal als Farce

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