MPC7455 DMA buffer strangeness

Oliver Korpilla okorpil at
Tue Jul 6 20:09:56 EST 2004

Hello, Adrian!

When removing the line

vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);

from my mmap() hook, DMA works as expected.

So my problem just transformed to "Differentiate mapping for Master Windows
(uncached) from mapping for DMA (cache coherent)".

Many a lot of thanks,
Oliver Korpilla

** Sent via the linuxppc-embedded mail list. See

More information about the Linuxppc-embedded mailing list