libaudiodriver: allocate mem lower 16 MB and 64K aligned

Righ now, the DMA controller will access some random memory below 16 MB,
as the physical address returned by alloc_contig() is simply truncated
when given to the DMA controller.

Yes, it's bad...

diff --git a/lib/libaudiodriver/audio_fw.c b/lib/libaudiodriver/audio_fw.c
index 5b9ea47e33b8ac24785368c962e31435f45a65d0..58ce03a4f4aedf35936f0d765ea99385d6b7b9b5 100644 (file)
--- a/lib/libaudiodriver/audio_fw.c
+++ b/lib/libaudiodriver/audio_fw.c
@@ -929,7 +929,7 @@ static int init_buffers(sub_dev_t *sub_dev_ptr)
 
        /* allocate dma buffer space */
        size= sub_dev_ptr->DmaSize + 64 * 1024;
-       base= alloc_contig(size, AC_ALIGN4K, &ph);
+       base= alloc_contig(size, AC_ALIGN64K|AC_LOWER16M, &ph);
        if (!base) {
                printf("%s: failed to allocate dma buffer for a channel\n", 
                                drv.DriverName);