Raspberry Pi 5 u-boot information isn't displayed on the serial port

I’m using meta-mender-community to build a Raspberry Pi 5, but after booting,

I’m finding that u-boot isn’t displayed on the serial port, while the kernel log
is. I’m not sure why.

Here are my steps:
git clone https://github.com/mendersoftware/meta-mender-community

mkdir -p meta-mender-community/my-build && cd meta-mender-community/my-build

kas build ../kas/raspberrypi5.yml

sudo dd if=./core-image-minimal-raspberrypi5-20250926074203.sdimg of=/dev/sda

Modify config.txt and add dtoverlay=uart0-pi5. Modify cmdline.txt and replace

console=serial0,115200 with console=ttyAMA0,115200. However, I found that

u-boot was not displayed on the serial port, while the kernel log was displayed
on the serial port.