sbloader: always send packets of size xfer_size (even the first). Also maintain a table of known transfer sizes. In particular stmp3770 uses 48 instead of 1024.

Change-Id: I08dddc76c251aeeaaa3b46c9466f9be54c3d4a45

utils/imxtools/sbloader.c

@@ -40,17 +40,30 @@ void put32be(uint8_t *buf, uint32_t i)
     *buf++ = i & 0xff;
 }
 
+struct dev_info_t
+{
+    uint16_t vendor_id;
+    uint16_t product_id;
+    unsigned xfer_size;
+};
+
+struct dev_info_t g_dev_info[] =
+{
+    {0x066f, 0x3780, 1024}, /* i.MX233 / STMP3780 */
+    {0x066f, 0x3770, 48}, /* STMP3770 */
+    {0x15A2, 0x004F, 1024}, /* i.MX28 */
+};
+
 int main(int argc, char **argv)
 {
     int ret;
-    uint8_t msg[0x20];
-    uint8_t *p;
     FILE *f;
     int i, xfer_size, nr_xfers, recv_size;
 
     if(argc != 3)
     {
         printf("usage: %s <xfer size> <file>\n", argv[0]);
+        printf("If <xfer size> is set to zero, the preferred one is used.\n");
         return 1;
     }
 
@@ -68,11 +81,18 @@ int main(int argc, char **argv)
     
     libusb_set_debug(NULL, 3);
 
-    /* MX23 */
-    dev = libusb_open_device_with_vid_pid(NULL, 0x066F, 0x3780);
+    for(unsigned i = 0; i < sizeof(g_dev_info) / sizeof(g_dev_info[0]); i++)
+    {
+        dev = libusb_open_device_with_vid_pid(NULL,
+            g_dev_info[i].vendor_id, g_dev_info[i].product_id);
         if(dev == NULL)
-        /* MX28 */
-        dev = libusb_open_device_with_vid_pid(NULL, 0x15A2, 0x004F);
+            continue;
+        if(xfer_size == 0)
+            xfer_size = g_dev_info[i].xfer_size;
+        printf("Found a match for %04x:%04x\n",
+            g_dev_info[i].vendor_id, g_dev_info[i].product_id);
+        break;
+    }
     if(dev == NULL)
     {
         printf("Cannot open device\n");
@@ -113,37 +133,36 @@ int main(int argc, char **argv)
     }
     fclose(f);
     
-    memset(msg, 0, 0x20);
+    uint8_t *xfer_buf = malloc(1 + xfer_size);
+    uint8_t *p = xfer_buf;
     
-    p = msg;
+    *p++ = 0x01;         /* Report id */
     
-    *p++ = 0x01; // Init upload command
-    *p++ = 'B'; // Signature
+    /* Command block wrapper */
+    *p++ = 'B';          /* Signature */
     *p++ = 'L';
     *p++ = 'T';
     *p++ = 'C';
-    put32le(p, 0x1); // I guess version or sub-command
+    put32le(p, 0x1);     /* Tag */
     p += 4;
-    put32le(p, size); // Payload size
+    put32le(p, size);    /* Payload size */
+    p += 4;
+    *p++ = 0;            /* Flags (host to device) */
+    p += 2;              /* Reserved */
     
-    // The second command starts at 0x20
-    
-    p = &msg[0x10];
-    
-    *p++ = 0x02; // Start upload
-    put32be(p, size); // Payload size, again
+    /* Command descriptor block */
+    *p++ = 0x02;         /* Firmware download */
+    put32be(p, size);    /* Download size */
     
     ret = libusb_control_transfer(dev, 
         LIBUSB_REQUEST_TYPE_CLASS | LIBUSB_RECIPIENT_INTERFACE, 0x9, 0x201, 0,
-        msg, 0x20, 1000);
+        xfer_buf, xfer_size + 1, 1000);
     if(ret < 0)
     {
         printf("transfer error at init step\n");
         return 1;
     }
 
-    uint8_t *xfer_buf = malloc(1 + xfer_size);
-
     for(i = 0; i < nr_xfers; i++)
     {
         xfer_buf[0] = 0x2;