[PATCH] cpm_uart: Made non-console uart work

Murch, Christopher cmurch at mrv.com
Sat Sep 10 05:21:10 EST 2005

We've recently applied the 2.6.13 patch.  We're running on an embedded
platform using 3 of the cpm uart ports on an 8xx cpu.  After applying the
2.6.13 patch the non-console uarts no longer work.  Upon investigation, we
have found that cpu2cpm_addr() is giving us invalid results for memory
addresses derived from dma_alloc_coherent().  This causes the cpm to hang.
We believe that the better approach would be to use the dma address supplied
by the call to dma_alloc_coherent() instead of trying to convert using
bus_to_virt() and virt_to_bus().  We believe this is the approach taken by
other drivers in the 2.6 kernel.  Any comments?
Thanks for your help.

cmurch at mrv.com

More information about the Linuxppc-embedded mailing list