[U-Boot] u-boot can boot Linux in zImage format while not in uImage format

Hi All, I am meeting a strange issue. The u-boot can boot device tree supported Linux in zImage format and can not boot in uImage format. The detail information as following:

1. set the bootargs 2. tftp 0x21000000 dtb, and tftp 0x22000000 uImage, then bootm 0x22000000 - 0x21000000, it can not boot up. Stop at "Starting kernel..." 3. tftp 0x21000000 dtb, and tftp 0x22000000 zImage, then bootz 0x22000000 - 0x21000000, it boot successfully.

I check the memory usage, no overlap. I try other memory address, won't fix. I check all parameters pass to kernel is right.

Any possible reason will cause this issue?

Best Regards, Bo Shen