len0rd/rockbox
1
0
Fork 1
mirror of https://github.com/Rockbox/rockbox.git synced 2025-11-17 00:52:38 -05:00
Code Issues Projects Releases Packages Wiki Activity Actions

imx233: make sure dma descriptors are cache friendly

Browse source 
Because DMA descriptors needs to be committed and discarded from
the cache, if they are not cache aligned and/or if their size
is not a multiple of cache ligne, nasty side effects could occur
with adjacents data. The same applies to DMA buffers which are
still potentially broken. Add a macro to ensure that these
constraints will not break by error in the future.

Change-Id: I1dd69a5a9c29796c156d953eaa57c0d281e79846
This commit is contained in:
Amaury Pouly 2012-05-20 01:23:17 +02:00
parent 1adc474771
commit 1b6e8cba62
5 changed files with 34 additions and 7 deletions
Download patch file Download diff file Expand all files Collapse all files

4
firmware/target/arm/imx233/dma-imx233.h
View file

@ -118,6 +118,10 @@
* COMMON *
**********/
/* DMA structures should be cache aligned and be padded so that their size
* is a multiple of a cache line size. Otherwise some nasty side effects
* could occur with adjacents data fields.
* The same apply to DMA buffers for the same reasons */
struct apb_dma_command_t
{
struct apb_dma_command_t *next;