Someone

void mmcStart(void)
{
    //Code added to fill buffer with something 
	int i;
	u08 mystring[20] = "01234567890123456789";
	c = 0;
	for (i=0;i<=512;i++) {
		buffer[i] = mystring[c];
		c++;
		if (c > 19) { c = 0; }
	}
    //Code added to fill buffer with something 
    // initialize card 
	rprintf("\r\nResetting MMC/SD Card\r\n");
	mmcReset();
	
}

void mmcWriteBuffer(void)
{
	// write current sector with data from buffer
	vt100SetCursorPos(1,10);
	rprintf("\r\nWrite Sector %d\r\n", sector);
	mmcWrite(sector, buffer);
	sector+=512;
}