What is the baudrate of the serial console?

I have seen information that indicates the RK3328 defaults to1500000bps and confirmed this in the uboot code.

I have built friendlywrt myself and attempted to change the baudrate from 1500000 to 115200:
u-boot/configs/rk3328_box_defconfig:CONFIG_SYS_EXTRA_OPTIONS="RKCHIP_RK3328,RKCHIP_RK322XH,PRODUCT_BOX,NORMAL_WORLD,SECOND_LEVEL_BOOTLOADER,BAUDRATE=115200"

However, I am still unable to get text on the console, console output appears during expect times at boot, but the text is garbage.

My USB-serial adapter has a max rate of 500kbps.

Thank you.