[PATCH v2 net-next] sky2: use random address if EEPROM is bad

From: Liviu Dudau
Date: Tue Aug 11 2015 - 10:36:11 EST

On some embedded systems the EEPROM does not contain a valid MAC address.
In that case it is better to fallback to a generated mac address and
let init scripts fix the value later.

Reported-by: Liviu Dudau <Liviu.Dudau@xxxxxxx>
Signed-off-by: Stephen Hemminger <stephen@xxxxxxxxxxxxxxxxxx>
[Changed handcoded setup to use eth_hw_addr_random() instead]
Signed-off-by: Liviu Dudau <Liviu.Dudau@xxxxxxx>
I have tested this on my Juno platform and I can successfully do an nfsroot boot.

Best regards,

drivers/net/ethernet/marvell/sky2.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/drivers/net/ethernet/marvell/sky2.c b/drivers/net/ethernet/marvell/sky2.c
index d9f4498..c309879 100644
--- a/drivers/net/ethernet/marvell/sky2.c
+++ b/drivers/net/ethernet/marvell/sky2.c
@@ -4819,6 +4819,13 @@ static struct net_device *sky2_init_netdev(struct sky2_hw *hw, unsigned port,
memcpy_fromio(dev->dev_addr, hw->regs + B2_MAC_1 + port * 8,

+ /* if the address is invalid, use a random value */
+ if (!is_valid_ether_addr(dev->dev_addr)) {
+ netdev_warn(dev,
+ "Invalid MAC address, defaulting to random\n");
+ eth_hw_addr_random(dev);
+ }
return dev;


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