Split transfers into smaller chunks to avoid ENOMEM

--- a/releases/smdk-tools-v0.20/dltool/dltool.c
+++ b/releases/smdk-tools-v0.20/dltool/dltool.c
@@ -7,6 +7,7 @@
 
 #include <sys/types.h>
 #include <sys/stat.h>
+#include <sys/param.h>
 
 #include <stdlib.h>
 #include <string.h>
@@ -19,6 +20,8 @@
 
 #include <libusb.h>
 
+#define CHUNKSIZE (1 << 18)
+
 unsigned int   debug   = 0;
 unsigned long  dl_addr = 0x30000000L;
 unsigned long  dl_size = 0L;
@@ -211,7 +214,7 @@
 	int dl_udev = -1;
 	uint8_t bus_num, dev_num;
 	unsigned long fsize;
-	int ret, transferred;
+	int ret, transferred = 0;
 
 	printf("SMDK42XX,S3C64XX USB Download Tool\n");
 	printf("Version 0.20 (c) 2004,2005,2006"
@@ -349,14 +352,20 @@
 	write_header(dl_data, dl_addr, dl_size);
 	calc_cksum(dl_data, dl_size);
 
-	//ret = libusb_bulk_transfer(devh, 3, dl_data, dl_size, &transferred, 5*1000*1000);
-	ret = libusb_bulk_transfer(devh, ep_out, dl_data, dl_size, &transferred, 5*1000*1000);
-	printf("=> usb_bulk_write() returned %d\n", ret);
-
-	if (ret || transferred != dl_size) {
-		printf("failed to write %ld bytes (wrote %d): %s\n",
-			dl_size, transferred, strerror(errno));
-		ret = 1;
+	while (transferred < dl_size) {
+		int actual, expected = MIN(dl_size - transferred, CHUNKSIZE);
+		ret = libusb_bulk_transfer(devh, ep_out, dl_data + transferred,
+			expected, &actual, 5*1000*1000);
+		printf("=> usb_bulk_write(%d) returned %d, wrote %d\n",
+			expected, ret, actual);
+		transferred += actual;
+
+		if (ret || (expected != actual)) {
+			printf("failed to write %ld bytes (wrote %d): %s\n",
+				dl_size, transferred, strerror(errno));
+			ret = 1;
+			break;
+		}
 	}
 
 	free(dl_data);