I have the same problem as the topic CPU1 failed to come online , I do not find how that problem was solved.
I use the SDK 2017-03 version. And NXP FAE told me that he do not know how to solve this.
My cpu is ls1021a,
The board in question is costmized by us, took LS1021ATWR as refference.
I have saved all the messages except emmc info coming out from u-boot and from the linux boot loader in the attached file.