Hello, I am about to bring Jason McMullan's DMA routines up to linux-2.6 Currently I am in the process of getting the things started step by step.
Until today I had a pretty hard time for some basic direct dma transfers because it seems that dma channel 0 doesn't work at all on my hardware (PPC8540PX833LB 2L71V MSIA QEAD0412). The status register always stays 0x0 (means everything is happy and okay) but it doesn't copy any data. I cannot even trigger a programming error by a wrong configuration! But when I let ch 1,2,3 do the work, everything seems to work fine! I havent found anything in the errata sheets or in the web. Can a DMA machine crash that it stays completely unusable? Have anybody seen similar things like that? Some other questions: I would also suggest to put my revised and almost complete immap_85xx.h and the mpc85xx_dma module into the current linux tree (Kumar?) to get things like that started more easily. Why is Jason's work not in the Kernel? If you are fine with that, I can offer some patches. But I first need to strip tons of the debug stuff from the last two weeks. :-/ Best greets, Clemens Koller _______________________________ R&D Imaging Devices Anagramm GmbH Rupert-Mayer-Str. 45/1 81379 Muenchen Germany http://www.anagramm.de Phone: +49-89-741518-50 Fax: +49-89-741518-19
