Okay got it now. The omap I am using has a ARM926 which has a MMU. So I shouldn't be using SNDRV_DMA_TYPE_CONTINUOUS. I will try to allocate using other methods. On 6/27/07, Clemens Ladisch <cladisch@xxxxxxxxxxxx> wrote: > Pharaoh . wrote: > > On 6/27/07, Clemens Ladisch <cladisch@xxxxxxxxxxxx> wrote: > > > SNDRV_DMA_TYPE_CONTINUOUS is for a buffer that cannot be accessed > > > over DMA. > > > > > > What kind of bus does your hardware use, and how would you > > > allocate memory for it? > > > > Continuous buffers unrelated to the bus type can be allocated using > > SNDRV_DMA_TYPE_CONTINUOUS right? I am referring a standard driver from > > omap source tree, and the buffer allocation functions I have copied > > from there and they should be same for the range of OMAPs since the > > dma handling is same for them. > > I don't know anything about OMAP. > > If the processor doesn't use a MMU, then the memory addresses as seen > by the CPU are the same as those used by a device using DMA. In that > case, you could use SNDRV_DMA_TYPE_CONTINUOUS and the correct address > would be available as runtime->dma_area. > > > HTH > Clemens > _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
