linux-2.4.18 & copy-back cache mode

Dan Malek dan at
Thu Mar 7 03:28:39 EST 2002

Laurent Pinchart wrote:

> It's a Rev. D.3

Hmmmm....I regularly use one of those for testing (maybe it's an 855T),
and it seems OK for me.  The first one I had didn't work well, but
it was tracked down to a UPM/SDRAM timing problem.  People keep talking
about running > 50 MHz bus on these newer parts, is there something
different about the memory controller that allows this and may cause
compatibility problems?  I have (fortunately :-) not looked at this
level of detail in the newer parts.

When you disable copyback you also disable burst mode write from
the CPU core.

	-- Dan

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

More information about the Linuxppc-embedded mailing list