[U-Boot] configuring U-Boot for custom board based on at91rm9200ek

Hi i need to configure u-boot-2012.10, for my custom board, that is very close to at91rm9200ek, except that i have 32MB NOR flash, and 32MB SDRAM. what i fail to understand is the following config parameters:

#define CONFIG_SYS_PIOC_ASR_VAL #define CONFIG_SYS_PIOC_BSR_VAL //#define CONFIG_SYS_PIOC_PDR_VAL #define CONFIG_SYS_PIOC_PDR_VAL #define CONFIG_SYS_EBI_CSA_VAL #define CONFIG_SYS_SDRC_CR_VAL #define CONFIG_SYS_SDRAM CONFIG_SYS_SDRAM_BASE /* address of the SDRAM */ #define CONFIG_SYS_SDRAM1 (CONFIG_SYS_SDRAM_BASE+0x80) #define CONFIG_SYS_SDRAM_VAL #define CONFIG_SYS_SDRC_MR_VAL #define CONFIG_SYS_SDRC_MR_VAL1 #define CONFIG_SYS_SDRC_MR_VAL2 #define CONFIG_SYS_SDRC_MR_VAL3 #define CONFIG_SYS_SDRC_TR_VAL

Any help is badly required.

Thanks Arivendu