diff -urN crunchfc.c crunchfc.c
--- crunchfc.c	2008-03-30 01:21:47.000000000 +1300
+++ crunchfc.c	2009-10-26 09:13:04.000000000 +1300
@@ -407,6 +407,7 @@
 	MESSAGE(VERB_HIGH, "Writing %d bytes at offset %d\n", 
 		TYPE_SIZE(key.type), offset);
 
+#if !defined(__FreeBSD__)
 	/* do an actual write to the device or file */
 	if (lseek(data->fd, data->offset+offset, SEEK_SET) == -1) {
 		MESSAGE(VERB_LOW, "lseek() failed\n");
@@ -416,6 +417,7 @@
 		MESSAGE(VERB_LOW, "write() failed\n");
 		return -1;
 	}
+#endif
 	/* keep our buffer in sync with the device or file */
 	memcpy(key.dataval, buf, TYPE_SIZE(key.type));
 
@@ -451,6 +453,7 @@
 
 	MESSAGE(VERB_HIGH, "Writing CRC at offset %d\n", len-4);
 
+#if !defined(__FreeBSD__)
 	/* do an actual write to the device or file */
 	if (lseek(data->fd, data->offset+len-4, SEEK_SET) == -1) {
 		MESSAGE(VERB_LOW, "CRC: lseek() failed\n");
@@ -460,6 +463,7 @@
 		MESSAGE(VERB_LOW, "CRC: write() failed\n");
 		return;
 	}
+#endif
 	/* keep our buffer in sync with the device or file */
 	memcpy(buf+len-4, &crc, sizeof(crc));
 
diff -urN fconfig.c fconfig.c
--- fconfig.c	2008-03-30 01:21:48.000000000 +1300
+++ fconfig.c	2009-10-26 10:11:01.000000000 +1300
@@ -45,6 +45,8 @@
 #include "ftypes.h"
 #include "crunchfc.h"
 
+#define REDBOOT_DEV	"/dev/redboot/RedBoot config"
+
 /*
  * Parse type name, return type ID. 
  * Type ID is the type number in the type table. 
@@ -163,6 +165,16 @@
 
 	recalculate_crc(&data);
 
+#if defined(__FreeBSD__)
+	/* FreeBSD needs to do a full sector write */
+	if (lseek(data.fd, 0, SEEK_SET) == -1) {
+		MESSAGE(VERB_LOW, "lseek() failed\n");
+		return -1;
+	}	
+	if (write(data.fd, data.buf, MAX_CONFIG_DATA) == -1) {
+		MESSAGE(VERB_LOW, "write() failed\n");
+	}
+#endif
 	close_fconfig_handle(&data);
 	return 0;
 
@@ -292,8 +304,12 @@
 	}
 
 	if (device == NULL) {
+#if defined(__FreeBSD__)
+		device = REDBOOT_DEV;
+#else
 		MESSAGE(VERB_LOW, "You must provide a device name.\n");
 		exit(1);
+#endif
 	}
 
 	switch (mode) {
diff -urN ftypes.c ftypes.c
--- ftypes.c	2006-03-15 03:18:18.000000000 +1300
+++ ftypes.c	2009-10-26 10:07:04.000000000 +1300
@@ -21,8 +21,13 @@
 #include <arpa/inet.h>
 
 /* For ether_aton */
+#if defined(__FreeBSD__)
+#include <sys/types.h>
+#include <net/ethernet.h>
+#else
 #include <net/ethernet.h>
 #include <netinet/ether.h>
+#endif
 
 #include <stdlib.h>
 #include <stdio.h>