[EMAIL PROTECTED] wrote: > 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).
What kernel version? arch/ppc or arch/powerpc? What is the error about dma-mapping that you get? What does your memory map look like (in particular, is there anything that might be getting mapped in conflict with the consistent area at 0xff100000)? -Scott _______________________________________________ Linuxppc-embedded mailing list Linuxppc-embedded@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-embedded
