例如，F(xiàn)lash燒寫命令封裝如下：

CMD_TBL_FLASH

{flash,DoWriteToFlashBlocks,

flash {loader/kernel/root} {block1/.../block16}

Copy to Flash from SDRAM of Area.

flash [dest] [src] [len]

Copy to Flash from src to dest. ,

flash {loader/kernel/root} {block1/.../block16}

Copy to Flash from SDRAM. ,

flash {loader/kernel/root} {block1/.../block16}

Copy to Flash from SDRAM of Area.

flash [dest] [src] [len]

Copy to Flash from src to dest.

}

其中，flash是其命令字;DoWriteToFlashBlocks為其處理方法的方法名;flash {loader/kernel/root} {block1/.../block16}和flash [dest] [src] [len]為其命令的使用格式(其中“{}”內(nèi)為可選項，“[]”內(nèi)為必選項)。

2.2 BootLoader改進(jìn)實(shí)驗

此次改進(jìn)就是在原有BootLoader的基礎(chǔ)上，增加對移動存儲介質(zhì)SD卡以FAT格式進(jìn)行讀取數(shù)據(jù)的指令來實(shí)現(xiàn)的。命令封裝如下：

CMD_TBL_SD_READ

{readSD, DoReadFromSDBlocks,

readSD [filename] [addr] Read data from SD to SDRAM for startup. ,

readSD [filename] [addr] Read data from SD to SDRAM for startup. ,

readSD [filename] [addr] Read data from SD to SDRAM for startup.

}

其功能是，在SD卡中把指定目錄下的內(nèi)核文件提取到SDRAM區(qū)域中，從而完成內(nèi)核的加載。