uboot下读取flash，上传tftp服务器、下载

 上传

setenv gatewayip 192.168.1.1;
setenv serverip 192.168.1.7;
setenv ipaddr 192.168.1.156 ;
mw.b 0x82000000 0xff 0x1000000
sf probe 0
sf read 0x82000000 0 0x1000000
tftp 0x82000000 test.bin 0x1000000

 下载

mw.b 82000000 ff 1000000
tftp 82000000 test.bin
sf probe 0
sf erase 0 1000000
sf write 82000000 0 1000000