The reason I'm asking Rsdio to open a new thread is because I saw he is asking question in this thread opened by you, we would ask customer to keep the one-thread-one-topic and from a single user, this would makes it easy for us to track the customer requests, and not to miss any request.
To this specific build error with bf527bf527-ezkit_defconfig: this bf527-ezkit_defconfig is for very old silicon version, for silicon available now you usually need the bf527-ezkit-v2_defconfig or bf527-ezkit-v2-fdpic_defconfig, please check the silicon version on the top of the BF527 chip and use the correct configuration accordingly. Our test case does not cover the ancient silicon version so yes you may run into an error, thanks for reporting we will try to fix.