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am335x: ddr_defs: Update EMIF parameters

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EMIF parameters are calculated based on the AC timing
parameters from the SDRAM datasheet and the DDR frequency.

Current values for these paramters in AM335x U-Boot code,
though reliable, are not fully optimal. The most optimal
settings can be derived based on the guidelines published
at [1]. A pre-computed set of values with the most optimum
settings for AM335x EVM and BeagleBone can be found at [2].

[1] http://processors.wiki.ti.com/index.php/AM335x_EMIF_Configuration_tips
[2] http://processors.wiki.ti.com/index.php/OMAP_and_Sitara_CCS_support#AM335x

Signed-off-by: Vaibhav Bedia <vaibhav.bedia@ti.com>
Signed-off-by: Tom Rini <trini@ti.com>
This commit is contained in:
Vaibhav Bedia 2012-04-20 13:28:16 +05:30 committed by Albert ARIBAUD
parent c8da4a587c
commit 7d8a961d31
1 changed files with 5 additions and 5 deletions
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10
arch/arm/include/asm/arch-am33xx/ddr_defs.h
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@ -29,11 +29,11 @@
#define CMD_DELAY 0x00
#define PHY_DLL_LOCK_DIFF 0x0
#define DDR2_EMIF_READ_LATENCY 0x05
#define DDR2_EMIF_TIM1 0x0666B3D6
#define DDR2_EMIF_TIM2 0x143731DA
#define DDR2_EMIF_TIM3 0x00000347
#define DDR2_EMIF_SDCFG 0x43805332
#define DDR2_EMIF_READ_LATENCY 0x100005 /* Enable Dynamic Power Down */
#define DDR2_EMIF_TIM1 0x0666B3C9
#define DDR2_EMIF_TIM2 0x243631CA
#define DDR2_EMIF_TIM3 0x0000033F
#define DDR2_EMIF_SDCFG 0x41805332
#define DDR2_EMIF_SDREF 0x0000081a
#define DDR2_DLL_LOCK_DIFF 0x0
#define DDR2_RATIO 0x80