Petalinux-build Disable serial Post build error

A tricky question:

If the serial port is not plugged into the PC, the Petalinux system will not start. Then want to disable the serial port, disable off, re-petalinux-config--get-hw-description-p. /

And then Petalinux-build, there was an error.

.../build/linux/u-boot/src/u-boot-plnx/common/board_f.c:in function ' init_baud_rate ': [All]

/home//...BUILD/LINUX/U-BOOT/SRC/U-BOOT-PLNX/COMMON/BOARD_F.C:143:$: Error:' Config_baudrate ' undeclared

View build Log

Build log:

[all ]   cc      common/board_f.o
[all ]/home/christine/peta_ 2014.4/1/2/3/lan/build/linux/u-boot/src/u-boot-plnx/common/board_f.c:in function ' init_baud_rate ':
[ALL  ]/home/christine/peta_2014.4/1/2/3/lan/build/linux/u-boot/src/u-boot-plnx/common/board_f.c:143:46:error: ' Config_baudrate ' Undeclared (first use of this function)
[all ]   gd->baudrate = Getenv_ulong (" BaudRate ", ten, Config_baudrate);
[all ]                                                 ^
[all ]/home/ Christinepeta_2014.4/1/2/3/lan/build/linux/u-boot/src/u-boot-plnx/common/board_f.c:143:46:note:each Undeclared Identifier is reported only once for each function it appears in

Take a look at the following pictures to find out the solution:

Petalinux-build Disable serial Post build error