[TG3]: Fix probe failure due to invalid MAC address
Some older bootcode in some devices may report 0 MAC address in SRAM when booting up from low power state. This patch fixes the problem by checking for a valid MAC address in SRAM and falling back to NVRAM if necessary. Thanks to walt <wa1ter@myrealbox.com> for reporting the problem and helping to debug it. Signed-off-by: NMichael Chan <mchan@broadcom.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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