From: Stephen Warren swarren@nvidia.com
On systems with caches enabled, NAND I/O may need to flush/invalidate the cache during read/write operations. For this to work correctly, all buffers must be cache-aligned. Fix nand_verify*() to allocate aligned buffers.
This prevents cache alignment warnings from being spewed when using U-Boot to write an updated version of itself to flash on NVIDIA Tegra Seaboard (after perturbation of stack/data layout in current u-boot-dm/next branch).
I have validatd (executed) nand_verify(), but I don't think I've executed nand_verify_page_oob(); testing of that would be useful.
Cc: Peter Tyser ptyser@xes-inc.com Cc: Heiko Schocher hs@denx.de Cc: Scott Wood scottwood@freescale.com Fixes: 59b5a2ad83df ("nand: Add verification functions") Signed-off-by: Stephen Warren swarren@nvidia.com --- v2: Use memalign() rather than ALLOC_CACHE_ALIGN_BUFFER() so that the buffer is allocated from the heap not on the stack, to reduce stack usage. --- drivers/mtd/nand/nand_util.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/mtd/nand/nand_util.c b/drivers/mtd/nand/nand_util.c index 12dd26a33fac..ee2c24df3b85 100644 --- a/drivers/mtd/nand/nand_util.c +++ b/drivers/mtd/nand/nand_util.c @@ -483,7 +483,7 @@ int nand_verify_page_oob(nand_info_t *nand, struct mtd_oob_ops *ops, loff_t ofs)
memcpy(&vops, ops, sizeof(vops));
- vops.datbuf = malloc(verlen); + vops.datbuf = memalign(ARCH_DMA_MINALIGN, verlen);
if (!vops.datbuf) return -ENOMEM; @@ -520,7 +520,7 @@ int nand_verify(nand_info_t *nand, loff_t ofs, size_t len, u_char *buf) int rval = 0; size_t verofs; size_t verlen = nand->writesize; - uint8_t *verbuf = malloc(verlen); + uint8_t *verbuf = memalign(ARCH_DMA_MINALIGN, verlen);
if (!verbuf) return -ENOMEM;