[U-Boot] [PATCH V2] fs/fat: align disk buffers on cache line to enable DMA and cache

[Anatolij Gustschin <agust@denx.de>]

Hello Dirk,

On Sat, 24 Mar 2012 08:18:38 +0100
Dirk Behme <dirk.behme@googlemail.com> wrote:

> On 13.03.2012 02:24, Eric Nelson wrote:
> > On 03/04/2012 02:46 PM, Eric Nelson wrote:
> >> Signed-off-by: Eric Nelson<eric.nelson@boundarydevices.com>
> >> Acked-by: Mike Frysinger<vapier@gentoo.org>
> >> ---
> >> fs/fat/fat.c | 14 ++++++++------
> >> 1 files changed, 8 insertions(+), 6 deletions(-)
> >>
> >> diff --git a/fs/fat/fat.c b/fs/fat/fat.c
> >> index 1f95eb4..f3c48bb 100644
> >> --- a/fs/fat/fat.c
> >> +++ b/fs/fat/fat.c
> >> @@ -31,6 +31,8 @@
> >> #include<fat.h>
> >> #include<asm/byteorder.h>
> >> #include<part.h>
> >> +#include<malloc.h>
> >> +#include<linux/compiler.h>
> >>
> >> /*
> >> * Convert a string to lowercase.
> >> @@ -62,7 +64,7 @@ static int disk_read(__u32 block, __u32 nr_blocks,
> >> void *buf)
> >>
> >> int fat_register_device (block_dev_desc_t * dev_desc, int part_no)
> >> {
> >> - unsigned char buffer[dev_desc->blksz];
> >> + ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
> >  > <snip>
> >
> > Hi Wolfgang,
> >
> > Have you had a chance to review this patch? Is there another
> > maintainer for fs/fat?
> >
> > Please let me know if you need this updated.
> >
> > There's another patch that was acked by Mike but is otherwise
> > lingering here:
> >
> > http://lists.denx.de/pipermail/u-boot/2012-March/119309.html
> >
> > Both of these are needed before enabling the data cache on i.MX6 when
> > using
> > the FAT filesystem.
> 
> Anybody likes to comment/apply this patch?

Both, this patch and the patch referenced by the above link were
submitted when the merge window was closed. So, the patches will
probably be applied to next when rc1 is out, unless Wolfgang
decides to accept them for coming release.

Thanks,
Anatolij