fdt命令的使用

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官方参考：https://www.denx.de/wiki/DULG/UBootCmdFDT

U_BOOT_CMD(fdt,255,0,do_fdt,"flattened device tree utility commands",    "addr   <addr> [<length>]        - Set the fdt location to <addr>\n"#ifdef CONFIG_OF_BOARD_SETUP"fdt boardsetup                      - Do board-specific set up\n"#endif"fdt move   <fdt> <newaddr> <length> - Copy the fdt to <addr> and make it active\n""fdt resize                          - Resize fdt to size + padding to 4k addr\n""fdt print  <path> [<prop>]          - Recursive print starting at <path>\n""fdt list   <path> [<prop>]          - Print one level starting at <path>\n""fdt set    <path> <prop> [<val>]    - Set <property> [to <val>]\n""fdt mknode <path> <node>            - Create a new node after <path>\n""fdt rm     <path> [<prop>]          - Delete the node or <property>\n""fdt header                          - Display header info\n""fdt bootcpu <id>                    - Set boot cpuid\n""fdt memory <addr> <size>            - Add/Update memory node\n""fdt rsvmem print                    - Show current mem reserves\n""fdt rsvmem add <addr> <size>        - Add a mem reserve\n""fdt rsvmem delete <index>           - Delete a mem reserves\n""fdt chosen [<start> <end>]          - Add/update the /chosen branch in the tree\n""                                        <start>/<end> - initrd start/end addr\n""NOTE: Dereference aliases by omiting the leading '/', ""e.g. fdt print ethernet0.");

示例：

1. 首先将dtb文件上传

tftpboot 0x84000000 board.dtb

2.设置fdt的地址

fdt addr 0x84000000

3. 打印header信息

fdt header

4.打印/

fdt print /

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