XModem协议

转自：http://blog.csdn.net/mcgrady_tracy/article/details/14522263

未经原博客同意，未附在下面

说明：kermit  modem；X  modem;y modem。函数调用的为相同的。x  modem为流控制型

下面为uboot的命令：loadb  loadx  loady。函数中会对各种情况进行分析

U_BOOT_CMD(loadb, 3, 0,do_load_serial_bin,"loadb   - load binary file over serial line (kermit mode)\n","[ off ] [ baud ]\n""    - load binary file over serial line"" with offset 'off' and baudrate 'baud'\n");/* support xmodem, www.100ask.net */U_BOOT_CMD(    loadx, 3, 0,    do_load_serial_bin,    "loadx   - load binary file over serial line (xmodem mode)\n",    "[ off ] [ baud ]\n"    "    - load binary file over serial line"    " with offset 'off' and baudrate 'baud'\n");U_BOOT_CMD(loady, 3, 0,do_load_serial_bin,"loady   - load binary file over serial line (ymodem mode)\n","[ off ] [ baud ]\n""    - load binary file over serial line"" with offset 'off' and baudrate 'baud'\n");