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Commit 18a8505c authored by Sekhar Nori's avatar Sekhar Nori Committed by Kevin Hilman
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davinci: am18x/da850/omap-l138 evm: setup NAND flash timing 



Setup the NAND flash timings for DA850 EVM

Before configuring the timing values, throughput calculation
using dd command yielded 469 kB/s write and 966 kB/s read speed.

After the timing configuration, the throughput was measured to
be 2.4 MB/s write and 5 MB/s read.

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

Signed-off-by: default avatarSekhar Nori <nsekhar@ti.com>
Cc: Mukul Bhatnagar <mbhatnagar@ti.com>
Acked-by: default avatarKevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: default avatarKevin Hilman <khilman@deeprootsystems.com>
parent 217f1366

arch/arm/mach-davinci/board-da850-evm.c

+12 −0
Original line number Diff line number Diff line
@@ -36,6 +36,7 @@ 
#include <mach/da8xx.h>

#include <mach/nand.h>

#include <mach/mux.h>

#include <mach/aemif.h>



#define DA850_EVM_PHY_MASK		0x1

#define DA850_EVM_MDIO_FREQUENCY	2200000 /* PHY bus frequency */
@@ -143,12 +144,23 @@ static struct mtd_partition da850_evm_nandflash_partition[] = { 
	},

};



static struct davinci_aemif_timing da850_evm_nandflash_timing = {

	.wsetup		= 24,

	.wstrobe	= 21,

	.whold		= 14,

	.rsetup		= 19,

	.rstrobe	= 50,

	.rhold		= 0,

	.ta		= 20,

};



static struct davinci_nand_pdata da850_evm_nandflash_data = {

	.parts		= da850_evm_nandflash_partition,

	.nr_parts	= ARRAY_SIZE(da850_evm_nandflash_partition),

	.ecc_mode	= NAND_ECC_HW,

	.ecc_bits	= 4,

	.options	= NAND_USE_FLASH_BBT,

	.timing		= &da850_evm_nandflash_timing,

};



static struct resource da850_evm_nandflash_resource[] = {