Am Donnerstag, 26. Mai 2005 21:39 schrieb Dan Malek:
> On May 26, 2005, at 9:20 AM, Hauke Goos-Habermann wrote:
> > Does anybody have an idea how to make the CCA4 mapping?
> In the mmap() entry for the driver:
> pgprot_val(vma->vm_page_prot) |= (4 << 9); /* CCA4 */
This is what I tried earlier. It doesn't speed up the driver. Enabling the
caching with setting the CMEM register doesn't help too.
> or, whatever is appropriate. This will only work from a user
> application (like X-Windows) that mmaps() the driver, you
> aren't going to get a kernel mapped space this way without
> some special VM space hacking.
I think that's what I need. The normal framebuffer driver is very slow and I
need a faster and direct access to the video memory.
That's why I tried to use the add_wired_entry function. There I can enable the
CCA4 and make a wired entry. But this doesn't work either:
add_wired_entry((0x00800000 >> 2) | 0x0027, (0x00900000 >> 2) | 0x0027,
0x30000000 | 0x0027, 0x01ffe000);
add_wired_entry((0x00a00000 >> 2) | 0x0027, (0x00a00000 >> 2) | 0x0027,
0x32000000 | 0x0027, 0x01ffe000);
The graphic card is a FUJITSU MB86290. Does anybody have experiences with this
Does anybody have an idea how to make the access to the video memory faster?
> -- Dan