On Thu, 2009-09-10 at 13:30 -0700, Pravin Bathija wrote: > There is also a patch that was submitted for 440EPX a couple of years > back. The 440EPX SOC causes hangs with Memory Read Multiple (MRM) > commands. Whether MRM is used or not depends on the value of > PCI_CACHE_LINE_SIZE register. I see that the changes are no longer > present in linux 2.6.30+ kernels. Although the patch certainly resolved > the hang issue with Silicon Image 680 PATA card as the 680 driver > attempts to use MRM commands - I don't know if it would resolve the data > corruption issue. It is certainly worth trying in my opinion. Below is a > link to the patch submission: > > http://git.denx.de/?p=linux-2.6-denx.git;a=commit;h=cffefde924123e685327 > 48dd58fcb780eab5e219
The changes in the above repository is a quick hack that can't be merged as-is (and afaik hasn't been submitted). If indeed we need to clamp the PCI cache line size on those critters, then we need something in ppc4xx_pci.c to detect the need, set pci_cache_line_size to 0 and eventually fixup the existing values in devices in case u-boot don't have them right. Care to send a patch ? :-) Cheers, Ben _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
