AGL 6.0.0 booting on R-Car H3 not completed
> [ 0.005858] NOTICE: BL2: PRR is R-Car H3 Ver1.1 According to this log you are using H3 v1.1.
AGL 6.0.0 is based on Yocto v3.7.0.
And Yocto v3.7.0 doesn't support H3 v1.1 SK. Please refer to the following.
Currently, H3 v2.0 and M3 SK are out of stock. I hope that you already have H3 v2.0 SK or M3 SK.