u-boot load u-boot from ram

We have run a u-boot from flash now.

How do we run a u-boot from ram?

The default qemu_arm_defconfig's CONFIG_SYS_TEXT_BASE is 0x00000000

CONFIG_TEXT_BASE=0x40200000

in u-boot:

u-boot default env $loadaddr is 40200000.

tftp $loadaddr 192.168.55.1:u-boot.bin
go $loadaddr