Tool/software:
AM335x GPMC-NAND boot issue was observed with AM335x Linux SDK 9.1 [1].
The FAQ lists the u-boot and kernel patches to support flashing and booting u-boot/kernel/root_fs with AM335x Linux SDK 9.1 from GPMC-NAND on AM335x EVM [2]
[1] https://www.ti.com/tool/download/PROCESSOR-SDK-LINUX-AM335X/09.01.00.001
[2] https://www.ti.com/tool/TMDXEVM3358