U-Boot中操作三种flash的命令集：
???????????????? Action???????????????????????????????????????? ?NOR??????????????????????????????????? ????????? NAND??????????????????????? ?????????????????? SPI
Copy Flash to RAM????????????????????????????????? cp.[bwl]?????????????????????????????????????? nand read???????????????????????????????? eeprom read
Write to Flash from RAM??????????????????????? cp.[bwl]??????????????????????????????????????? nand write???????????????????????????????? eeprom write
Dump Flash??????????????????????????????????????????? ?md.[bwl]???????????????????????????????????? ?nand dump?????????????????????????????? eeprom read
Ease Flash?????????????????????????????????????????????? ?erase???????????? ??????????????????????????? nand erase??????????????????????????????????????? n/a
Write Protection??????????????????????????????????? protect on????????????????????????????????????? nand lock
???????????????????????????????????????????????????????????????? protect off????????????????????????????????????? nand unlock???????????????????????????????????? ?n/a
Additional??Info???????????????????????????????????????? ?flinfo?????????????????????????????????????????? nand info
?????????????????????????????????????????????????????????????????? ?imls??????????????????????????????????????????? nand bad???????????????????????????????????????? n/a
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U-Boot中查看命令帮助：
MB680> help cp???
MB680> help nand???
MB680> help eeprom?
nor烧写命令：
MB680> nfs $load_addr /export/u-boot.bin???
MB680> protect off 1:0-4???
MB680> erase 1:0-4???
MB680> cp.b $load_addr A0000000 $filesize???
MB680> protect on 1:0-4??
nor烧写内置命令：?
MB680> nfs $load_addr /export/u-boot.bin???
MB680> run unprot???
MB680> run update?
nand烧写命令：
MB680> nfs $load_addr /export/u-boot.bin???
MB680> nand erase 0 40000???
MB680> nand write $load_addr 0 40000??
U-Boot启动内核的时候使用的命令是nand read.i c0008000 80000 500000;bootm c0008000
在nand中0x80000处开始的5M的数据拷到sdram0xc0008000处，从这个地址开始执行。
spi烧写命令： MB680> nfs $load_addr /export/u-boot.bin??? MB680> eeprom write $load_addr 0 $filesize??
