1 files changed, 70 insertions, 0 deletions
diff --git a/flash_otp_lock.c b/flash_otp_lock.c
new file mode 100644
index 0000000..bd56df3
--- /dev/null
+++ b/flash_otp_lock.c
@@ -0,0 +1,70 @@
+/*
+ * flash_otp_lock.c -- lock area of One-Time-Program data
+*/
+
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <sys/ioctl.h>
+
+#include <mtd/mtd-user.h>
+
+int main(int argc,char *argv[])
+{
+	int fd, val, ret, offset, size;
+	char *p, buf[8];
+
+	if (argc != 5 || strcmp(argv[1], "-u")) {
+		fprintf(stderr, "Usage: %s -u <device> <offset> <size>\n", argv[0]);
+		fprintf(stderr, "offset and size must match on OTP region boundaries\n");
+		fprintf(stderr, "CAUTION! ONCE LOCKED, OTP REGIONS CAN'T BE UNLOCKED!\n");
+		return EINVAL;
+	}
+
+	fd = open(argv[2], O_WRONLY);
+	if (fd < 0) {
+		perror(argv[2]);
+		return errno;
+	}
+
+	val = MTD_OTP_USER;
+	ret = ioctl(fd, OTPSELECT, &val);
+	if (ret < 0) {
+		perror("OTPSELECT");
+		return errno;
+	}
+
+	offset = strtoul(argv[3], &p, 0);
+	if (argv[3][0] == 0 || *p != 0) {
+		fprintf(stderr, "%s: bad offset value\n", argv[0]);
+		return ERANGE;
+	}
+
+	size = strtoul(argv[4], &p, 0);
+	if (argv[4][0] == 0 || *p != 0) {
+		fprintf(stderr, "%s: bad size value\n", argv[0]);
+		return ERANGE;
+	}
+
+	printf("About to lock OTP user data on %s from 0x%x to 0x%x\n",
+	       argv[2], offset, offset + size);
+	printf("Are you sure (yes|no)? ");
+	if (fgets(buf, sizeof(buf), stdin) && strcmp(buf, "yes\n") == 0) {
+		struct otp_info info;
+		info.start = offset;
+		info.length = size;
+		ret = ioctl(fd, OTPLOCK, &info);
+		if (ret	< 0) {
+			perror("OTPLOCK");
+			return errno;
+		}
+		printf("Done.\n");
+	} else {
+		printf("Aborted\n");
+	}
+
+	return 0;
+}