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Commit 217f1366 authored by Sudhakar Rajashekhara's avatar Sudhakar Rajashekhara Committed by Kevin Hilman
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davinci: am17x/da830/omap-l137 evm: setup NAND flash timing 



Setup the NAND flash timings for DA830 EVM.

Before configuring the timing values, throughput calculation
using dd command yielded 477 kB/s write and 970 kB/s read speed.

After the timing configuration, the throughput was measured to
be 2.5 MB/s write and 5.1 MB/s read.

[Mukul Bhatnagar: actual calculation of timing values from the
NAND datasheet]

Signed-off-by: default avatarSudhakar Rajashekhara <sudhakar.raj@ti.com>
Cc: Mukul Bhatnagar <mbhatnagar@ti.com>
Signed-off-by: default avatarSekhar Nori <nsekhar@ti.com>
Acked-by: default avatarKevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: default avatarKevin Hilman <khilman@deeprootsystems.com>
parent fe69c82d

arch/arm/mach-davinci/board-da830-evm.c

+12 −0
Original line number Diff line number Diff line
@@ -29,6 +29,7 @@ 
#include <mach/nand.h>

#include <mach/da8xx.h>

#include <mach/usb.h>

#include <mach/aemif.h>



#define DA830_EVM_PHY_MASK		0x0

#define DA830_EVM_MDIO_FREQUENCY	2200000	/* PHY bus frequency */
@@ -360,6 +361,16 @@ static struct nand_bbt_descr da830_evm_nand_bbt_mirror_descr = { 
	.pattern	= da830_evm_nand_mirror_pattern

};



static struct davinci_aemif_timing da830_evm_nandflash_timing = {

	.wsetup         = 24,

	.wstrobe        = 21,

	.whold          = 14,

	.rsetup         = 19,

	.rstrobe        = 50,

	.rhold          = 0,

	.ta             = 20,

};



static struct davinci_nand_pdata da830_evm_nand_pdata = {

	.parts		= da830_evm_nand_partitions,

	.nr_parts	= ARRAY_SIZE(da830_evm_nand_partitions),
@@ -368,6 +379,7 @@ static struct davinci_nand_pdata da830_evm_nand_pdata = { 
	.options	= NAND_USE_FLASH_BBT,

	.bbt_td		= &da830_evm_nand_bbt_main_descr,

	.bbt_md		= &da830_evm_nand_bbt_mirror_descr,

	.timing         = &da830_evm_nandflash_timing,

};



static struct resource da830_evm_nand_resources[] = {