Re: [alsa-devel] Getting physical address of the DMA buffer

Pharaoh . wrote:

I have allocated the DMA buffer using snd_pcm_lib_malloc_pages() and it was preallocated as:

snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS, snd_dma_continuous_data (GFP_KERNEL),

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?

Regards, Clemens