Re: O_SYNC patch -> slow fb memory access

[Thomas Winischhofer <thomas@winischhofer.net>]

Branden Robinson wrote:
> On Sun, Sep 21, 2003 at 10:47:57AM +0200, Egbert Eich wrote:
>
> > No, I removed it again. O_SYNC causes the memory to be mapped
> > uncached. I had a system which crashed horribly when this flag
> > was not set for MMIO. Now I believe the system itself was faulty.
> > I'm still not sure if caching should be set at all for MMIO registers,
> > however since O_SYNC is an open() syscall flag and there is no
> > way of asking for uncached mempry mapping when doing mmap() we'd
> > have to have two separate file handles.
> > The affected file was os-support/linux/lnx_video.c
>
>
> Thanks for the explanation.  I have updated Debian's patches to use the
> latest version (3.67) of lnx_video.c.  This fix will appear in the next
> release of our packages of XFree86 4.3.0.

Thanks.

Thomas

--
Thomas Winischhofer
Vienna/Austria
thomas AT winischhofer DOT net          http://www.winischhofer.net/
twini AT xfree86 DOT org