ls1043a without optee


hello all,

I am trying to boot ls1043a without optee.
I managed to compile and run atf until it jumps to uboot.
There i do not get any serial output anymore.

INFO: Loading image id=5 at address 0x82000000
INFO: sd-mmc read done.
INFO: Image id=5 loaded: 0x82000000 - 0x820afbc3
NOTICE: BL2: Booting BL31
INFO: Entry point address = 0xbbe00000
NOTICE: BL31: v1.5(release):devtool-patched-dirty
NOTICE: BL31: Built : 08:19:07, May 13 2020
NOTICE: Welcome to ls1043ardb BL31 Phase
INFO: ARM GICv2 driver initialized
INFO: BL31: Initializing runtime services
INFO: BL31: Preparing for EL3 exit to normal world
INFO: Entry point address = 0x82000000
INFO: SPSR = 0x3c9

My question is, what do i need to change in uboot config?
And what are possible causes for this?

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