u-boot-2011.03在TQ2440上的移植--支持串口xmodem协议

败败0619 2012-10-05

展开全文

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