Quinn Jensen wrote: > > jsun@hermes.mvista.com wrote: > > > Quinn Jensen wrote: > > > >>>> Is anyone else having trouble with NFS root on > >>>> the 2.4.0 kernel? It won't come up with the > >>>> KSEG0 cache on unless I pepper the network driver > >>>> with flush calls. > >>> > >>> > >>> That's expected for most old network drivers that don't yet use tye > he > >>> new PCI DMA API documented in Documentation/DMA-mapping.txt. > >>> > >>> What driver is this? > >> > >> Both the stock 2.4.0 tulip and eepro100 drivers. The > >> problem doesn't happen when I go back to 2.3.99pre8. > >> > > > > Did you set rx_copybreak to 1518? I sent patches long time ago to the driver > > authors for MIPS, but I am not sure they are not there. > > Jun, > > I have tried that in this case but it didn't help, > because the receive skb data pointers all point to > the KSEG0 view of the data anyway. I looked into similar problems a while back. If I remeber correctly, the data pointers do point to kseg0. It is up to the driver to do appropriate dma_cache_invalidate() (or some functions to that effect) at certain places. What is the CPU? It seems logical to suspect about the dma cache routines. Jun
