Hi everybody, I am having problems with the serial cpm driver in a mpc866. But I've found out that my problem comes from the DMA and not really from the driver. The Rx and Tx buffers use the DMA and then the sytem hangs. However, if I set these buffers to internal ram memory (DPRAM), it works. The DMA address is configured with a kernel parameter in advance setup: CONFIG_CONSISTENT_START (and the size in CONFIG_CONSISTENT_SIZE), but I don't know what they are exactly and I could not find a right documentation about it. I saw a pair of mailing list where some guys set the CONFIG_CONSISTENT_START to 0xff100000, but my driver continues failing (and an error about dma-mapping appears in the boot).
Did anyone have a similar problem? Could anyone help me? Thanks in advance, Raúl Moreno _______________________________________________ Linuxppc-embedded mailing list Linuxppc-embedded@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-embedded
