Re: [PATCH] Use MTRRs by default for vesafb on x86-64

Etienne Lorrain
2003-05-19T09:04:00Z

Whatever the processor, you cannot use write combining MTRR
on 16 colors / 4 BPP modes. In this mode you can copy
8 pixels at a time by doing a simple movb, but it cannot
handle 32 pixel copy at the same time by a movd, for instance.
In 16 color modes, you never have a linear memory mapping
of pixels.

Etienne.

___________________________________________________________
Do You Yahoo!? -- Une adresse @yahoo.fr gratuite et en français !
Yahoo! Mail : http://fr.mail.yahoo.com