u-boot-2010.06在TQ2440上的移植<10>--支持串口xmodem协议

1、在windows下的SecureCRT只支持Xmodem和Zmodem，为了方便在Windows下载U-Boot，现在修改代码增加对Xmodem的支持，即增加一个命令loadx。

vi common/cmd_load.c

在ymodem命令下添加xmodem命令

U_BOOT_CMD(
 loady, 3, 0, do_load_serial_bin,
 "load binary file over serial line (ymodem mode)",
 "[ off ] [ baud ]\n"
 "    - load binary file over serial line"
 " with offset 'off' and baudrate 'baud'"
);

#if defined(ENABLE_CMD_LOADB_X)
U_BOOT_CMD(
 loadx, 3, 0,    do_load_serial_bin,
 "load binary file over serial line (xmodem mode)",
 "[ off ] [ baud ]\n"
 "    - load binary file over serial line"
 " with offset 'off' and baudrate 'baud'"
);
#endif

上面的条件编译需要在 include/configs/smdk2440.h中添加

#define ENABLE_CMD_LOADB_X     1

 

2、在do_load_serial_bin函数中增加对loadx命令的处理分支。也是依照loady来实现的：

if (strcmp(argv[0],"loadx")==0) {
  printf ("## Ready for binary (xmodem) download "
   "to 0x%08lX at %d bps...\n",
   offset,
   load_baudrate);

  addr = load_serial_xmodem (offset);

 }else if (strcmp(argv[0],"loady")==0) {
  printf ("## Ready for binary (ymodem) download "
   "to 0x%08lX at %d bps...\n",
   offset,
   load_baudrate);

  addr = load_serial_ymodem (offset);

 

3、在第2步被调用的函数load_serial_xmodem (offset)，它是依照load_serial_ymodem (offset)实现的。

static ulong load_serial_xmodem (ulong offset)
{
 int size;
 char buf[32];
 int err;
 int res;
 connection_info_t info;
 char xmodemBuf[1024];
 ulong store_addr = ~0;
 ulong addr = 0;

 size = 0;
 info.mode = xyzModem_xmodem;
 res = xyzModem_stream_open (&info, &err);
 if (!res) {

  while ((res =
   xyzModem_stream_read (xmodemBuf, 1024, &err)) > 0) {
   store_addr = addr + offset;
   size += res;
   addr += res;
#ifndef CONFIG_SYS_NO_FLASH
   if (addr2info (store_addr)) {
    int rc;

    rc = flash_write ((char *) xmodemBuf,
        store_addr, res);
    if (rc != 0) {
     flash_perror (rc);
     return (~0);
    }
   } else
#endif
   {
    memcpy ((char *) (store_addr), xmodemBuf,
     res);
   }

  }
 } else {
  printf ("%s\n", xyzModem_error (err));
 }

 xyzModem_stream_close (&err);
 xyzModem_stream_terminate (false, &getcxmodem);

 flush_cache (offset, size);

 printf ("## Total Size      = 0x%08x = %d Bytes\n", size, size);
 sprintf (buf, "%X", size);
 setenv ("filesize", buf);

 return offset;
}

 

至此，u-boot已经支持串口xmodem协议。

用命令 loadx 即可

[SMDK2440]# loadx
## Ready for binary (xmodem) download to 0x32000000 at 115200 bps...
CCC

点击SecureCRT菜单里Transfer选择Send Xmodem，选择要下载的文件即可。

Transferring HISTORY.TXT...
  100%       7 KB    3 KB/s 00:00:02       0 Errors

yzModem - CRC mode, 63(SOH)/0(STX)/0(CAN) packets, 7 retries
## Total Size      = 0x00001f01 = 7937 Bytes
[SMDK2440]#

 

PS:SecureCRT的设置和使用

<1>界面如下

<2>串口设置，点击菜单File --> connect 在出现的对话框中选择传输协议，如下图右边的框框里的勾勾都去掉

<3>下载上传路径设置点击菜单Options-->Session Options -->Xmodem/Zmodem