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AM335x: Unknown command 'protect' in U-boot

my  custom board:  CPLD connection am335x  and nor flash.

nor flash is S70GL02GS (256MB).

The first step :am335x boot from uart  and  into  "U-Boot#".

When I enter " protect off all"  it shows that  :Unknown command 'protect' - try 'help'

enter   " erase all"   shows  "Unknown command 'erase' - try 'help' "

The second step:

I through a serial port loading uboot.bin and copy to the nor flash   is  failed.

I don't understand the working principle of CPLD.

When CPLD connection am335x  and nor flash that: I don't know how to debug.