We are using a custom board based on a 405GP processor with a PIIX4 Southbridge (providing a PCI to ISA bridge, a DMA controller, an interrupt controller, ...) A FDC37C78 floppy disk controller is connected to the ISA bus, use a DMA and an interrupt line of the southbridge. Kernel version is 2.4.17 (Monta vista HHL 2.1) - When we perform WRITE operations to the floppy, dma data sent to the floppy controller are corrupted. I try some debug and i saw that when a corrupted data is sent, it was a data from the previous dma transfer from the same address. When i dump the memory (with BDI2000) at the end of the transfert, everything is OK. Does someone met this problem ? A cache pb ? How can i go further to debug ?
READ operations seems OK. Thanks for your help . Philippe ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
