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Yocto - Zybo-Zynq7 - strange serialconsole output




I try to create a boot image for a zybo zynq7 board with yocto for an academic project.

I use the zeus branch for yocto and all needed layers and the creating process runs without any errors.  

I use Ubuntu 20.04, the zeus branch isn't validated with this version so there is a warning in the beginning.

To create I used the following layers:

- meta-xilinx-bsp

- meta-xilinx-contrib

- meta-xilinx-tools

- meta-oe

- meta-python

In local.conf ich used MACHINE ?= "zynq-zybo7" and added the following lines:


EXTRA_IMAGEDEPENDS_append = " u-boot-zynq-scr"

UBOOT_EXTLINUX_FDT = "../${MACHINE}-system.dtb"
UBOOT_EXTLINUX_CONSOLE = "console=ttyPS0,${115200}"
UBOOT_EXTLINUX_ROOT = "root=/dev/mmcblk0p2"
UBOOT_EXTLINUX_KERNEL_ARGS_append = " earlycon clk_ignore_unused"


When I start the board an boot from SD card, there is running a process, I think it could be the booting, but in the serial console there is are hex codes like in the attached image.

I thought it could be a wrong BAUD but the problem remains with every BAUD. I also tried different settings for parity, and the number of stop bits and data bits.

Does someone know the problem?


Best regards

Mike K


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