U-boot操作Flash (NOR, NAND & SPI)

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uboot中操作三种flash的命令集：

ActionNORNANDSPICopy Flash to RAMcp.[bwl]nand readeeprom readWrite to Flash from RAMcp.[bwl]nand writeeeprom writeDump Flashmd.[bwl]nand dumpeeprom read ; md.[bwl]Ease Flasherasenand erasen/aWrite Protectionprotect on
protect offnand lock
nand unlockn/aAdditional Infoflinfo
imlsnand info
nand badn/a

uboot中查看命令帮助：

MB680> help cpMB680> help nandMB680> help eeprom

nor烧写命令：

MB680> nfs $load_addr /export/u-boot.binMB680> protect off 1:0-4MB680> erase 1:0-4MB680> cp.b $load_addr A0000000 $filesizeMB680> protect on 1:0-4

nor烧写内置命令：

MB680> nfs $load_addr /export/u-boot.binMB680> run unprotMB680> run update

nand烧写命令：

MB680> nfs $load_addr /export/u-boot.binMB680> nand erase 0 40000MB680> nand write $load_addr 0 40000

uboot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.binMB680> eeprom write $load_addr 0 $filesize