When flashing the firmware, it is best to do the tftpboot FIRST, after booting, then doing the env setup instructions, this makes the process execute reliable 100% of the time.
tftpboot 0x89000000 w1700k-initramfs.itb
setenv bootflag 0
setenv one flash read 0x600000 0x1000000 $loadaddr
setenv two "; bootm"
setenv bootcmd "$one$two"
setenv one
setenv two
saveenv
bootm 0x89000000