[U-Boot-Users] MPC8245 Silicon Workaround
marc.leeman at barco.com
Fri Jul 23 16:25:59 CEST 2004
What should be the policy on the tweaking hardware settings in the
u-boot bootloader? [safe or not].
As a result of the PCI/Memory buffer remarks, I re-did my tests and I
the troubles which required me to disable 3 of the 4 hardware buffers
with the register PCMBCR are no longer there (data corruption).
However, since then, my development board died on me and I had to
replace it with a new production board which has a later (>1.2) silicon
revision of the MPC8245 processor.
Disabling the buffers is safe: it provides a workaround for a possible
silicon bug in certain MPC8245 processors. However, it comes at a small
(<< 1%) performance cost IIRC .
If it should be _safe_; then the patch I sent and is now in CVS should
stay; if not, it can be commented out. I think it is still good to leave
it in comments though...
 Obviously, I need to re-do these performance tests on a board with
does not have the silicon bug (later revision, I am currently trying
to trace the exact revision number in our ordering system).
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Size: 189 bytes
Desc: Digital signature
Url : http://lists.denx.de/pipermail/u-boot/attachments/20040723/e6fadc95/attachment.pgp
More information about the U-Boot