[U-Boot] [PATCH] mpc83xx: add ELBC NAND support for the MPC837XEMDSboards

[Liu Dave-R63238]

It is due to hardware design and logic defect, that is the
I/O[0:7] of NAND chip is connected to LAD[7:0], so when
the NAND chip connected to nLCS3,  you have to set up the
OR3[BCTLD] = '1' for normal operation, otherwise it will have
bus contention due to the pin 48/25 of U60 is enabled.

Setup the OR3[BCTLD] = '1' , that meaning the LBCTL is not
asserted upon access to the NAND chip, keep the default state.

Acked-by: Dave Liu <daveliu at freescale.com>


> -----Original Message-----
> From: u-boot-bounces at lists.denx.de 
> [mailto:u-boot-bounces at lists.denx.de] On Behalf Of Anton Vorontsov
> Sent: 2008?10?9? 12:53 AM
> To: Phillips Kim-R1AAHA
> Cc: u-boot at lists.denx.de
> Subject: [U-Boot] [PATCH] mpc83xx: add ELBC NAND support for 
> the MPC837XEMDSboards
> 
> Though NAND chip is replaceable on the MPC837XE-MDS boards, the
> current settings don't work with the default chip on the board.
> Nevertheless Freescale's U-Boot sets the option register correctly,
> so I just dumped the register from the working u-boot. My guess is
> that the old settings were applicable for some pilot boards, not
> found in the production.
> 
> This patch also enables FSL ELBC driver so that we could access
> the NAND storage in the u-boot.
> 
> The NAND support costs about 45KB, so the u-boot no longer fits
> into two 128KB NOR flash sectors, thus we also have to adjust
> environment location: add another 128KB to the monitor length.
> 
> Signed-off-by: Anton Vorontsov <avorontsov at ru.mvista.com>
> ---
>  include/configs/MPC837XEMDS.h |   13 ++++++++++---
>  1 files changed, 10 insertions(+), 3 deletions(-)
> 
> diff --git a/include/configs/MPC837XEMDS.h 
> b/include/configs/MPC837XEMDS.h
> index adf7c8c..d78aa60 100644
> --- a/include/configs/MPC837XEMDS.h
> +++ b/include/configs/MPC837XEMDS.h
> @@ -204,7 +204,7 @@
>  #endif
>  
>  /* CFG_MONITOR_LEN must be a multiple of CONFIG_ENV_SECT_SIZE */
> -#define CFG_MONITOR_LEN		(256 * 1024) /* Reserve 
> 256 kB for Mon */
> +#define CFG_MONITOR_LEN		(384 * 1024) /* Reserve 
> 384 kB for Mon */
>  #define CFG_MALLOC_LEN		(512 * 1024) /* 
> Reserved for malloc */
>  
>  /*
> @@ -267,6 +267,12 @@
>  /*
>   * NAND Flash on the Local Bus
>   */
> +#define CONFIG_CMD_NAND		1
> +#define CONFIG_MTD_NAND_VERIFY_WRITE	1
> +#define CFG_MAX_NAND_DEVICE	1
> +#define NAND_MAX_CHIPS		1
> +#define CONFIG_NAND_FSL_ELBC 	1
> +
>  #define CFG_NAND_BASE		0xE0600000	/* 0xE0600000 */
>  #define CFG_BR3_PRELIM		( CFG_NAND_BASE \
>  				| (2<<BR_DECC_SHIFT)	/* Use 
> HW ECC */ \
> @@ -274,13 +280,14 @@
>  				| BR_MS_FCM		/* MSEL 
> = FCM */ \
>  				| BR_V )		/* valid */
>  #define CFG_OR3_PRELIM		( 0xFFFF8000		
> /* length 32K */ \
> -				| OR_FCM_CSCT \
> +				| OR_FCM_BCTLD \
>  				| OR_FCM_CST \
>  				| OR_FCM_CHT \
>  				| OR_FCM_SCY_1 \
> +				| OR_FCM_RST \
>  				| OR_FCM_TRLX \
>  				| OR_FCM_EHTR )
> -				/* 0xFFFF8396 */
> +				/* 0xFFFF919E */
>  
>  #define CFG_LBLAWBAR3_PRELIM	CFG_NAND_BASE
>  #define CFG_LBLAWAR3_PRELIM	0x8000000E	/* 32KB  */
> -- 
> 1.5.6.3
> _______________________________________________
> U-Boot mailing list
> U-Boot at lists.denx.de
> http://lists.denx.de/mailman/listinfo/u-boot
>