hi3515-Nand Flash烧写说明

第一章 Nand flash 烧写步骤

1、准备
    先调整拨码开关：底板Sw7和Sw8均拨为0，表示nor flash boot。 
    复位单板，通过nor flash启动，进入u-boot之后，运行如下步骤。
    
2、擦除整个 nand flash
    nand erase 0  

3、烧写主uboot到nand
    mw.b 0xC1500000 0xFF 0x100000;              # 内存清除为0xFF;
    tftp 0xC1500000 u-boot-hi3520v100_200M.bin;  # 先把boot load到内存;
    nand write 0xC1500000 0 0x100000;            # 然后把内存中的boot烧写到flash上，参数0表示偏移地址，0x100000表示写入文件的大小;

4、烧写主kernel到nand
    mw.b 0xC1500000 0xFF 0x200000;
    tftp 0xC1500000 kernel-hi3520v100_full_release.img;
    nand write 0xC1500000 0x100000 0x200000;
    # 注：若仅更新kernel，可仅擦除nand flash中kernel对应地址空间即可。擦除命令如下：
    #    nand erase 0x100000 0x200000

5、烧写从uboot到nand并设置
    mw.b 0xC1500000 0xFF 0x100000;
    tftp 0xC1500000 u-boot-hi3520v100_slave_200M.img;
    nand write 0xC1500000 0x300000 0x100000;
    set slave_bootargs mem=32M console=ttyAMA0,115200;
    saveenv
    
6、烧写从kernel和文件系统到nand
    mw.b 0xC1500000 0xFF 0x200000;