use high speed as default, fix current checksum

src/tools/ebuspicloader.cpp

@@ -34,7 +34,7 @@ static const struct argp_option argpoptions[] = {
     {"macip",   'M', nullptr, 0, "set the MAC address suffix from the IP address", 0 },
     {"flash",   'f', "FILE",  0, "flash the FILE to the device", 0 },
     {"reset",   'r', nullptr, 0, "reset the device at the end on success", 0 },
-    {"speed",   's', nullptr, 0, "enable high speed transfer", 0 },
+    {"slow",    's', nullptr, 0, "use low speed for transfer", 0 },
     {nullptr,          0,        nullptr,    0, nullptr, 0 },
 };
 
@@ -47,7 +47,7 @@ static bool setMask = false;
 static uint8_t setMaskLen = 0x1f;
 static char* flashFile = nullptr;
 static bool reset = false;
-static bool highSpeed = false;
+static bool lowSpeed = false;
 
 bool parseByte(const char *arg, uint8_t minValue, uint8_t maxValue, uint8_t *result) {
   char* strEnd = nullptr;
@@ -149,7 +149,7 @@ error_t parse_opt(int key, char *arg, struct argp_state *state) {
       reset = true;
       break;
     case 's':
-      highSpeed = true;
+      lowSpeed = true;
       break;
     default:
       return ARGP_ERR_UNKNOWN;
@@ -209,7 +209,7 @@ typedef union
 
 #define FRAME_HEADER_LEN 9
 #define FRAME_MAX_LEN (FRAME_HEADER_LEN+2*WRITE_FLASH_BLOCKSIZE)
-#define BAUDRATE_NORMAL B115200
+#define BAUDRATE_LOW B115200
 #define BAUDRATE_HIGH B921600
 #define WAIT_BYTE_TRANSFERRED_MILLIS 200
 #define WAIT_BITRATE_DETECTION_MICROS 100
@@ -594,7 +594,7 @@ int openSerial(std::string port) {
   struct termios termios;
   memset(&termios, 0, sizeof(termios));
 
-  if (cfsetspeed(&termios, highSpeed ? BAUDRATE_HIGH : BAUDRATE_NORMAL)!=0) {
+  if (cfsetspeed(&termios, lowSpeed ? BAUDRATE_LOW : BAUDRATE_HIGH)!=0) {
     std::cerr<<"unable to set speed "<<std::endl;
     close(fd);
     return -1;