> -----Original Message----- > From: David Laight [mailto:david.lai...@aculab.com] > Sent: Tuesday, March 05, 2013 1:16 AM > To: Jia Hongtao-B38951; linuxppc-dev@lists.ozlabs.org; > ga...@kernel.crashing.org > Cc: Wood Scott-B07421 > Subject: RE: [PATCH V4] powerpc/85xx: Add machine check handler to fix > PCIe erratum on mpc85xx > > > A PCIe erratum of mpc85xx may causes a core hang when a link of PCIe > > goes down. when the link goes down, Non-posted transactions issued via > > the ATMU requiring completion result in an instruction stall. > > At the same time a machine-check exception is generated to the core to > > allow further processing by the handler. We implements the handler > > which skips the instruction caused the stall. > > Just skipping the instruction doesn't seem a good idea. > But I suspect that re-initialising the PCI interface is also almost > impossible.
This *skipping* is the best way I thought for this errata. It's not perfect but works. -Hongtao. > > Does the mpc83xx have the same errata? > We've seen machine-check faults using the CSB bridge on an 83xx doing a > 'pio' access after a PEX_DMA transfer to certain target addresses stalls > - software gives up waiting for the dma. > The target is an fpga, nothing is mapped at those addesses - but we'd > expect to get ~0u back as happens on other slave windows. > > I also remember some problems with single word DMA. > > David > > _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
