Hello again... In the meanwhile, I got channel 0 working. It seems that the DMA#0 machine got stuck in some configuration from any previous (u-boot?) operation which didn't clean up things properly. I had to explicitly abort a (continously running?) transfer to be able to re-program it in the way I need.
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 Clemens Koller wrote: > 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 > _______________________________________________ > Linuxppc-embedded mailing list > Linuxppc-embedded at ozlabs.org > https://ozlabs.org/mailman/listinfo/linuxppc-embedded >
