[U-Boot] wizard about bi_arch_number

Dear all:

I have set board_init -->:

gd->bd->bi_arch_number = MACH_TYPE_OMAP3EVM,

and boot into uboot, bdinfo cmmand give me the message as follows:

arch_number = 0x0000 05FF

it seems everythings is okay. Loading kernel is aslo okay, serial port could print out compress header information. (I use uImage as Kernel Image). But, it halt on Starting kenel ......

I check kernel code, find it get bi_arch_number to MACH_TYPE_OMAP3_BEAGLE (1546).

could you give me some suggestiong?