Add new function eth_random_enetaddr() to generate a locally administered ethernet address.
Signed-off-by: Michael Walle michael@walle.cc --- include/net.h | 15 +++++++++++++++ net/eth.c | 15 +++++++++++++++ 2 files changed, 30 insertions(+), 0 deletions(-)
diff --git a/include/net.h b/include/net.h index 5560785..1fceb99 100644 --- a/include/net.h +++ b/include/net.h @@ -117,6 +117,21 @@ extern int eth_setenv_enetaddr(char *name, const uchar *enetaddr); extern int eth_getenv_enetaddr_by_index(const char *base_name, int index, uchar *enetaddr);
+/* + * 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 seti + * the ethernet address. + * Eg. you wan't 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); + extern int usb_eth_initialize(bd_t *bi); extern int eth_init(bd_t *bis); /* Initialize the device */ extern int eth_send(volatile void *packet, int length); /* Send a packet */ diff --git a/net/eth.c b/net/eth.c index aabb343..4441969 100644 --- a/net/eth.c +++ b/net/eth.c @@ -70,6 +70,21 @@ static int eth_mac_skip(int index) return ((skip_state = getenv(enetvar)) != NULL); }
+void eth_random_enetaddr(uchar *enetaddr) +{ + uint32_t rval; + + srand(get_timer(0)); + rval = rand(); + + enetaddr[0] = 0x02; /* locally administered */ + enetaddr[1] = 0x00; + enetaddr[2] = 0x00; + enetaddr[3] = rval & 0xff; + enetaddr[4] = (rval >> 8) & 0xff; + enetaddr[5] = (rval >> 16) & 0xff; +} + /* * CPU and board-specific Ethernet initializations. Aliased function * signals caller to move on