Hi there, I am trying to get DMA support for MPC8xx IDE. For now I use the IDMA channel. It is kind of working although it's not much more than a framework yet.
BUT: My problem right now is this: After activating the DMA (e.g. using hdparm -d1 /dev/hda) the output of my serial console (connected to SMC1) gets garbaged when there is HDD activity. If I telnet into my machine and do e.g. a "fdisk -l /dev/hda" the output of the serial console looks something like this ^PttyS: 80 input overrun(s) ^P^P^P^P^P^P^P^P^P^ ^PP ^ ^PP ^ ^PP ^P ^P^P^P^P^P^P ^P ^P^P^P^P^P^P^P^P^P^P^P^P^PttyS: 80 input overrun(s) If I redirect console input into a file it contains 0x10 and 0x20 bytes. So someone is flooding the serial port (SMC) with the two byte 0x10 and 0x20 ! (I might have seen 0x10 and 0xA0 as well.) Any ideas? Could there be a problem in using the internal ram area. Maybe my IDMA is conflicting with anyother existing driver (SMC???) ? Thanks, Steven ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
