Re: Frame buffer use on Coldfire problem
On Dec 19, 3:00 pm, Geert Uytterhoeven <ge...@linux-m68k.org> wrote:
> On Wed, 19 Dec 2007, jkim...@one.net wrote:
> > I'm running a 2.6.10 kernel on a Coldfire (M5484) and I'm trying to
> > get some frame buffer graphics going. The video chip I'm using is a
> > Epson S1D13a04 and there was actually a driver for Linux kernel 2.6.8
> > from Epson that I was able to port to my kernel. Thought life was good
> > but I have yet to get anything on the screen at all. My first attempt
> > is listed below. The problem occurs on the memory map (mmap) command.
> > Thought the /dev/fb0 device opens and the call to ioctl returns valid
> > information, when I call mmap to set up the memory the call fails
> > (returns -1). The device resides at physical address 0x44040000.
> > screensize = vinfo.xres * vinfo.yres * vinfo.bits_per_pixel / 8;
> > fbp = mmap((caddr_t)0, screensize, PROT_READ|PROT_WRITE, MAP_SHARED,
> > fbfd, 0);
>
> I guess it fails because screensize is not a multiple of the page size?
>
> For testing frame buffer devices, you can always try fbtest (CVS module
> FBdev/utlilities/fbtest (yes, spelling typo in the path name ;-) from
> project linux-fbdev.sf.net, cfr.http://linux-fbdev.sourceforge.net/develop.html).
>
> Gr{oetje,eeting}s,
>
> Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- ge...@linux-m68k.org
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
> -- Linus Torvalds
>
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Thanks Geert. Kind of a silly thing for me to miss....
I'll look into the fbtest stuff. Hopefully that will clear the fog for
me a little....
jk
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