Simon,
-----Original Message----- From: Simon Glass [mailto:sjg@chromium.org] Sent: Sunday, July 29, 2012 11:53 PM To: U-Boot Mailing List Cc: Tom Warren; Stephen Warren; Scott Wood; Simon Glass Subject: [PATCH v4 1/6] nand: Try to align the default buffers
The NAND layer needs to use cache-aligned buffers by default. Towards this goal. align the default buffers and their members according to the minimum DMA alignment defined for the architecture.
Signed-off-by: Simon Glass sjg@chromium.org
Changes in v2:
- Add new patch to align default buffers in nand_base
drivers/mtd/nand/nand_base.c | 3 ++- include/linux/mtd/nand.h | 7 ++++--- 2 files changed, 6 insertions(+), 4 deletions(-)
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c index bfd668f..891af1f 100644 --- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -2936,7 +2936,8 @@ int nand_scan_tail(struct mtd_info *mtd) struct nand_chip *chip = mtd->priv;
if (!(chip->options & NAND_OWN_BUFFERS))
chip->buffers = kmalloc(sizeof(*chip->buffers), GFP_KERNEL);
chip->buffers = memalign(ARCH_DMA_MINALIGN,sizeof(*chip->buffers));diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h index 82704de..dc839e7 100644 --- a/include/linux/mtd/nand.h +++ b/include/linux/mtd/nand.h @@ -391,9 +391,10 @@ struct nand_ecc_ctrl {
- consecutive order.
*/ struct nand_buffers {
- uint8_t ecccalc[NAND_MAX_OOBSIZE];
- uint8_t ecccode[NAND_MAX_OOBSIZE];
- uint8_t databuf[NAND_MAX_PAGESIZE + NAND_MAX_OOBSIZE];
- uint8_t ecccalc[ALIGN(NAND_MAX_OOBSIZE, ARCH_DMA_MINALIGN)];
- uint8_t ecccode[ALIGN(NAND_MAX_OOBSIZE, ARCH_DMA_MINALIGN)];
- uint8_t databuf[ALIGN(NAND_MAX_PAGESIZE + NAND_MAX_OOBSIZE,
ARCH_DMA_MINALIGN)];};
This causes build failures in the M28EVK build (./MAKEALL -a arm, with current u-boot-tegra/next & gcc 4.4.1):
In file included from mxs_nand.c:29: /home/tom/denx/uboot-tegra/include/linux/mtd/nand.h:394: warning: implicit declaration of function 'ALIGN' /home/tom/denx/uboot-tegra/include/linux/mtd/nand.h:394: error: 'ARCH_DMA_MINALIGN' undeclared here (not in a function) /home/tom/denx/uboot-tegra/include/linux/mtd/nand.h:394: error: variably modified 'ecccalc' at file scope /home/tom/denx/uboot-tegra/include/linux/mtd/nand.h:395: error: variably modified 'ecccode' at file scope /home/tom/denx/uboot-tegra/include/linux/mtd/nand.h:397: error: variably modified 'databuf' at file scope make[1]: *** [mxs_nand.o] Error 1 make[1]: *** Waiting for unfinished jobs.... make: *** [drivers/mtd/nand/libnand.o] Error 2 make: *** Waiting for unfinished jobs....
PTAL. Thanks,
Tom
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