UART doesn't work

Hello all:

Does anybody have experience in Marvell5182? I meet a uart issue on
Marvell5182.
Athough there are two UARTs on the demo board, I can only use UART0, the
second
UART can't be used, I do the same settings for UART1 as UART0, but It seems that
UART1 still doesn't work, So I write the UART1 TX register directly on the U-boot command
line, while using oscillograph to test if there are any output singals, from the oscillograph ,
The UART1 doesn't have any outputs. I don't know why, anybody can tell me what to do?
By the way, I have opened all the possible macros in the include file.

Thanks in advance!

With kind regards,
Robert Xia