1 files changed, 42 insertions, 0 deletions
diff --git a/sys/i386/netboot/makerom.c b/sys/i386/netboot/makerom.c
new file mode 100644
index 000000000000..98cc65130ec4
--- /dev/null
+++ b/sys/i386/netboot/makerom.c
@@ -0,0 +1,42 @@
+#include <stdio.h>
+#include <fcntl.h>
+
+unsigned char rom[ROMSIZE];
+unsigned int sum;
+
+main(argc,argv)
+	int argc; char *argv[];
+{
+	int i, fd;
+	if (argc < 1) {
+		fprintf(stderr,"usage: %s rom-file\n",argv[0]);
+		exit(2);
+	}
+	if ((fd = open(argv[1], O_RDWR)) < 0) {
+		perror("unable to open file");
+		exit(2);
+	}
+	bzero(rom, ROMSIZE);
+	if (read(fd, rom, ROMSIZE) < 0) {
+		perror("read error");
+		exit(2);
+	}
+	rom[5] = 0;
+	for (i=0,sum=0; i<ROMSIZE; i++)
+		sum += rom[i];
+	rom[5] = -sum;
+	for (i=0,sum=0; i<ROMSIZE; i++);
+		sum += rom[i];
+	if (sum)
+		printf("checksum fails.\n");
+	if (lseek(fd, 0L, SEEK_SET) < 0) {
+		perror("unable to seek");
+		exit(2);
+	}
+	if (write(fd, rom, ROMSIZE) < 0) {
+		perror("unable to write");
+		exit(2);
+	}
+	close(fd);
+	exit(0);
+}