Kernel configuration options

[Bernardo Innocenti]

Tom Sylla wrote:

>> Not on the Geode: we don't have MTRRs, so I guess the kernel
>> is being mapped by 4KB pages.
> 
> 4MB page support is unrelated to MTRR support. (one is related to linear 
> addresses, the other physical addresses; please see the Intel or AMD 
> documentation on paging and caching)
> 
> Geode LX supports 4MB pages, it is reported as such in CPUID, and should 
> be used by the kernel.
> 
> Also note that Geode LX has "RCONFs" instead of MTRRs, which have the 
> same functionality, and they are all programmed properly by the firmware.

So I wonder why we couldn't use these to speed up access
to the framebuffer in the amd_drv X driver.

Jordan, what do you think?

-- 
 \___/
 |___|   Bernardo Innocenti - http://www.codewiz.org/
  \___\  One Laptop Per Child - http://www.laptop.org/