u-boot在s3c2416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