[coreboot] Trace MMIO Read/Write

[Myles Watson]

> -----Original Message-----
> From: Joseph Smith [mailto:joe at settoplinux.org]
> Sent: Wednesday, March 04, 2009 9:14 PM
> To: Myles Watson
> Cc: coreboot
> Subject: RE: [coreboot] Trace MMIO Read/Write
> 
> 
> 
> 
> On Wed, 4 Mar 2009 20:44:38 -0700, "Myles Watson" <mylesgw at gmail.com>
> wrote:
> >
> >
> >> -----Original Message-----
> >> From: coreboot-bounces+mylesgw=gmail.com at coreboot.org [mailto:coreboot-
> >> bounces+mylesgw=gmail.com at coreboot.org] On Behalf Of Joseph Smith
> >> Sent: Wednesday, March 04, 2009 6:13 PM
> >> To: Patrick Georgi; coreboot
> >> Subject: Re: [coreboot] Trace MMIO Read/Write
> >>
> >>
> >>
> >>
> >> On Wed, 04 Mar 2009 17:48:55 -0500, Joseph Smith <joe at settoplinux.org>
> >> wrote:
> >> >
> >> >
> >> >
> >> > On Wed, 04 Mar 2009 17:37:50 -0500, Joseph Smith
> <joe at settoplinux.org>
> >> > wrote:
> >> >>
> >> >>
> >> >>
> >> >> On Wed, 04 Mar 2009 23:27:07 +0100, Patrick Georgi
> >> >> <patrick at georgi-clan.de>
> >> >> wrote:
> >> >>> Am 04.03.2009 23:23, schrieb Joseph Smith:
> >> >>>> Hello,
> >> >>>> Is there anyway to trace (capture) reads and writes to a mmio
> space
> >> in
> >> >>>> Linux? A utility program maybe?
> >> >>>>
> >> >>> I think that's what the renouveau project does, so they should have
> > a
> >> >>> tool for that.
> >> >>> It should work by mapping the mmio area away, then catching all
> >> > accesses
> >> >>> before passing them trough.
> >> >>>
> >> >>>
> >> >> Thanks Patrick, I will check it out. Does it catch reads as well as
> >> >> writes?
> >> >>
> >> > Ahhh, thanks again Patrick!
> >> >
> >> > http://nouveau.freedesktop.org/wiki/MmioTrace
> >> >
> >> hmmm :-(
> >> I need to do this on a older kernel 2.6.10 and mmiotrace does not
> > support
> >> older kernels....
> >>
> >> Any other suggestions?
> >
> > Does it run in a simulator or an emulator?  SimNow or Qemu could log
> them
> > for you.
> >
> Can they simulate a Intel onboard graphics adapter?

Probably not easily.  Is the driver not open-source?  I'm wondering why you
couldn't recompile it for the newer kernel if you really want to use
MmioTrace.

Thanks,
Myles