[U-Boot] ralink RT3052 5X flash memory map

[RdrouterUboot Router]

Hi All,

Uboot works.Flash size is 4Mbyte.SDRAM is 32Mbyte.Flash memory map is:
0xBF00 0000 - 0xBF3F FFFF.
But MIPS CPU datasheet say: flasy memory map is:0x1F00 0000 - 0x1FFF FFFF.
Datasheet is wrong? or flash memory map can be changed by some rules?And
What is the rule?

Uboot version: v1.1.3;
MIPS CPU: Ralink RT3052;

RT3052 datasheet Memory Map say:
Start address end address  Size
1F00.0000 - 1FFF.FFFF     16MB(flash)
Description
When BOOT_FROM = 2’b00,up-to 16MB external 16-bit flash is mapped.
When BOOT_FROM = 2’b01, up-to 8MB external 8-bit flash is mapped.

Thanks.