[U-Boot-Users] How is DRAM_BANKS defined

Hi all, I'm trying to determine if my memory configuration is correct. How do I determine what CONFIG_NR_DRAM_BANKS should be, according to the CPU or the DRAM chip? My system has 32MB of DRAM but one BANK of my ARM CPU has a capacity of 256MB. So that means CONFIG_NR_DRAM_BANKS is 1. However, my DRAM chip is 4 banks (I'm using 2 chips each 1Meg x 16 x 4). So the question is how is "BANKS" defined in uboot? For some reason, the my kernel thinks I have 16MB (even though meminfo says 32MB) and I'm suspect the problem might be what the bootloader passes to the kernel.

Thanks.