diff options
| author | Ben Gardiner <bengardiner@nanometrics.ca> | 2010-10-14 17:26:22 -0400 |
|---|---|---|
| committer | Wolfgang Denk <wd@denx.de> | 2010-10-17 20:14:47 +0200 |
| commit | a3f88293ddd13facd734769c1664d35ab4ed681f (patch) | |
| tree | 2012092eae19cb39ffba52ac88b461b8e90a1683 | |
| parent | 756d1fe7ac96822f2125cddde08ccc608bd69a24 (diff) | |
| download | u-boot-imx-a3f88293ddd13facd734769c1664d35ab4ed681f.zip u-boot-imx-a3f88293ddd13facd734769c1664d35ab4ed681f.tar.gz u-boot-imx-a3f88293ddd13facd734769c1664d35ab4ed681f.tar.bz2 | |
da850evm: setup the NAND flash timings
The default NAND flash timings are very conservative. This patch assigns the
timings reccomended in the recent linux kernel patch [1] from Sekhar Nori. The
speedup, as reported in that patch, is 5.3x for reads.
[1] http://www.spinics.net/lists/arm-kernel/msg100278.html
Signed-off-by: Ben Gardiner <bengardiner@nanometrics.ca>
CC: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>
| -rw-r--r-- | board/davinci/da8xxevm/da850evm.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/board/davinci/da8xxevm/da850evm.c b/board/davinci/da8xxevm/da850evm.c index f84adb9..0eb9e29 100644 --- a/board/davinci/da8xxevm/da850evm.c +++ b/board/davinci/da8xxevm/da850evm.c @@ -24,6 +24,7 @@ #include <common.h> #include <i2c.h> #include <asm/arch/hardware.h> +#include <asm/arch/emif_defs.h> #include <asm/io.h> #include "../common/misc.h" #include "common.h" @@ -98,6 +99,23 @@ int board_init(void) irq_init(); #endif + +#ifdef CONFIG_NAND_DAVINCI + /* + * NAND CS setup - cycle counts based on da850evm NAND timings in the + * Linux kernel @ 25MHz EMIFA + */ + writel((DAVINCI_ABCR_WSETUP(0) | + DAVINCI_ABCR_WSTROBE(0) | + DAVINCI_ABCR_WHOLD(0) | + DAVINCI_ABCR_RSETUP(0) | + DAVINCI_ABCR_RSTROBE(1) | + DAVINCI_ABCR_RHOLD(0) | + DAVINCI_ABCR_TA(0) | + DAVINCI_ABCR_ASIZE_8BIT), + &davinci_emif_regs->ab2cr); /* CS3 */ +#endif + /* arch number of the board */ gd->bd->bi_arch_number = MACH_TYPE_DAVINCI_DA850_EVM; |