diff -urN ipxe-cmdlinesize/src/core/settings.c ipxe-machyp/src/core/settings.c
--- ipxe-cmdlinesize/src/core/settings.c	2010-11-11 14:09:48.062345190 -0500
+++ ipxe-machyp/src/core/settings.c	2010-11-12 10:49:22.822334798 -0500
@@ -1321,6 +1321,72 @@
 }
 
 /**
+ * Parse and store value of hex string setting, hyphen delimited
+ *
+ * @v settings		Settings block
+ * @v setting		Setting to store
+ * @v value		Formatted setting data
+ * @ret rc		Return status code
+ */
+static int storef_hexhyp ( struct settings *settings, struct setting *setting,
+			const char *value ) {
+	char *ptr = ( char * ) value;
+	uint8_t bytes[ strlen ( value ) ]; /* cannot exceed strlen(value) */
+	unsigned int len = 0;
+
+	while ( 1 ) {
+		bytes[len++] = strtoul ( ptr, &ptr, 16 );
+		switch ( *ptr ) {
+		case '\0' :
+			return store_setting ( settings, setting, bytes, len );
+		case '-' :
+			ptr++;
+			break;
+		default :
+			return -EINVAL;
+		}
+	}
+}
+/**
+ * Fetch and format value of hex string setting with hypphen delimiter
+ *
+ * @v settings		Settings block, or NULL to search all blocks
+ * @v setting		Setting to fetch
+ * @v buf		Buffer to contain formatted value
+ * @v len		Length of buffer
+ * @ret len		Length of formatted value, or negative error
+ */
+static int fetchf_hexhyp ( struct settings *settings, struct setting *setting,
+			char *buf, size_t len ) {
+	int raw_len;
+	int check_len;
+	int used = 0;
+	int i;
+
+	raw_len = fetch_setting_len ( settings, setting );
+	if ( raw_len < 0 )
+		return raw_len;
+
+	{
+		uint8_t raw[raw_len];
+
+		check_len = fetch_setting ( settings, setting, raw,
+					    sizeof ( raw ) );
+		if ( check_len < 0 )
+			return check_len;
+		assert ( check_len == raw_len );
+		
+		if ( len )
+			buf[0] = 0; /* Ensure that a terminating NUL exists */
+		for ( i = 0 ; i < raw_len ; i++ ) {
+			used += ssnprintf ( ( buf + used ), ( len - used ),
+					    "%s%02x", ( used ? "-" : "" ),
+					    raw[i] );
+		}
+		return used;
+	}
+}
+/**
  * Fetch and format value of hex string setting
  *
  * @v settings		Settings block, or NULL to search all blocks
@@ -1366,6 +1432,12 @@
 	.storef = storef_hex,
 	.fetchf = fetchf_hex,
 };
+/** A hex-string setting, hyphen delimited */
+struct setting_type setting_type_hexhyp __setting_type = {
+	.name = "hexhyp",
+	.storef = storef_hexhyp,
+	.fetchf = fetchf_hexhyp,
+};
 
 /**
  * Parse and store value of UUID setting
diff -urN ipxe-cmdlinesize/src/include/ipxe/settings.h ipxe-machyp/src/include/ipxe/settings.h
--- ipxe-cmdlinesize/src/include/ipxe/settings.h	2010-11-11 14:09:48.132334810 -0500
+++ ipxe-machyp/src/include/ipxe/settings.h	2010-11-12 10:50:51.433584483 -0500
@@ -227,6 +227,7 @@
 extern struct setting_type setting_type_uint16 __setting_type;
 extern struct setting_type setting_type_uint32 __setting_type;
 extern struct setting_type setting_type_hex __setting_type;
+extern struct setting_type setting_type_hexhyp __setting_type;
 extern struct setting_type setting_type_uuid __setting_type;
 
 extern struct setting ip_setting __setting;
@@ -243,6 +244,7 @@
 extern struct setting uuid_setting __setting;
 extern struct setting next_server_setting __setting;
 extern struct setting mac_setting __setting;
+extern struct setting machyp_setting __setting;
 extern struct setting busid_setting __setting;
 extern struct setting user_class_setting __setting;
 
diff -urN ipxe-cmdlinesize/src/net/netdev_settings.c ipxe-machyp/src/net/netdev_settings.c
--- ipxe-cmdlinesize/src/net/netdev_settings.c	2010-11-11 14:09:48.132334810 -0500
+++ ipxe-machyp/src/net/netdev_settings.c	2010-11-12 10:49:22.822334798 -0500
@@ -38,6 +38,11 @@
 	.description = "MAC address",
 	.type = &setting_type_hex,
 };
+struct setting machyp_setting __setting = {
+	.name = "machyp",
+	.description = "MAC address",
+	.type = &setting_type_hexhyp,
+};
 struct setting busid_setting __setting = {
 	.name = "busid",
 	.description = "Bus ID",
@@ -58,7 +63,7 @@
 	struct net_device *netdev = container_of ( settings, struct net_device,
 						   settings.settings );
 
-	if ( setting_cmp ( setting, &mac_setting ) == 0 ) {
+	if (( setting_cmp ( setting, &mac_setting ) == 0 ) || ( setting_cmp ( setting, &machyp_setting ) == 0 )) {
 		if ( len != netdev->ll_protocol->ll_addr_len )
 			return -EINVAL;
 		memcpy ( netdev->ll_addr, data, len );
@@ -84,7 +89,7 @@
 	struct device_description *desc = &netdev->dev->desc;
 	struct dhcp_netdev_desc dhcp_desc;
 
-	if ( setting_cmp ( setting, &mac_setting ) == 0 ) {
+	if (( setting_cmp ( setting, &mac_setting ) == 0 ) || ( setting_cmp ( setting, &machyp_setting ) == 0 )) {
 		if ( len > netdev->ll_protocol->ll_addr_len )
 			len = netdev->ll_protocol->ll_addr_len;
 		memcpy ( data, netdev->ll_addr, len );