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Hello,
On Nov 10, 2006, at 10:57, John wrote:
> Haven't been able to get OFB_FAKE_VGA_FB to work. Is
this only in the
> -current kernel? Or does it also depend on something
else in the
> kernel configuration? Also, while perusing the mail
archives I came
> upon this post:
> http://mail-index.netbsd.org/port-macppc/2004/03/09
/0004.html
It is an old enough hack to be in 3.0. Originally intended
for ofb only
but most other wsdisplay drivers respect it ( machfb,
chipsfb, voodoofb
and radeonfb do )
And what exactly did you do? "Haven't been able to get
<whatever> to
work" is not a useful problem description.
> Basically,
/xc/programs/Xserver/hw/xfree86/os-support/bsd/ppc_video.c
> was patched instead. I haven't tried it out yet though.
Don't bother, this patch is dangerous.
The problem is that many X drivers want to mmap the legacy
VGA
framebuffer at 0xa0000 which is pointless on a mac since it
isn't used
for anything. The patch allows you to mmap whatever is on
physical
address 0xa0000 which could be anything but certainly
nothing
VGA-related even if your VGA board has the legacy fb mapping
enabled -
anything below 0x80000000 on a mac is RAM, PCI memory can
only be
accessed from 0x8000000 and above so you'd be messing around
in system
memory instead.
OFB_FAKE_VGA_FB is a little more sane - it redirects
attempts to
mmap(0xa0000 - 0xbffff) to the beginning of the actual
framebuffer.
The reason why X is doing that is to save and restore VGA
textmode
information which is useless on macppc since nobody uses VGA
textmode,
the right thing to do would be to disable this code in X.
Some drivers
( like atimisc ) do it, others don't.
have fun
Michael
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