net: add helper to generate random mac address
Add new function eth_random_enetaddr() to generate a locally administered
ethernet address.
Signed-off-by: Michael Walle <michael@walle.cc>
Acked-by: Joe Hershberger <joe.hershberger@gmail.com>
diff --git a/include/net.h b/include/net.h
index a092f29..6d2d6cd 100644
--- a/include/net.h
+++ b/include/net.h
@@ -122,6 +122,23 @@
extern int eth_getenv_enetaddr_by_index(const char *base_name, int index,
uchar *enetaddr);
+#ifdef CONFIG_RANDOM_MACADDR
+/*
+ * The u-boot policy does not allow hardcoded ethernet addresses. Under the
+ * following circumstances a random generated address is allowed:
+ * - in emergency cases, where you need a working network connection to set
+ * the ethernet address.
+ * Eg. you want a rescue boot and don't have a serial port to access the
+ * CLI to set environment variables.
+ *
+ * In these cases, we generate a random locally administered ethernet address.
+ *
+ * Args:
+ * enetaddr - returns 6 byte hardware address
+ */
+extern void eth_random_enetaddr(uchar *enetaddr);
+#endif
+
extern int usb_eth_initialize(bd_t *bi);
extern int eth_init(bd_t *bis); /* Initialize the device */
extern int eth_send(void *packet, int length); /* Send a packet */