[U-Boot] [PATCH] net, fec_mxc: use mac address stored in env before looking in eeprom

[Heiko Schocher <hs@denx.de>]

Hello stefano,

Stefano Babic wrote:
> Heiko Schocher wrote:
> 
> Hi Heiko,
> 
>> Signed-off-by: Heiko Schocher <hs@denx.de>
>> ---
>>  drivers/net/fec_mxc.c |   15 +++++++++++----
>>  1 files changed, 11 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/net/fec_mxc.c b/drivers/net/fec_mxc.c
>> index 5af9cdb..b5245ec 100644
>> --- a/drivers/net/fec_mxc.c
>> +++ b/drivers/net/fec_mxc.c
>> @@ -749,11 +749,18 @@ static int fec_probe(bd_t *bd)
>>
>>  	eth_register(edev);
>>
>> -	if (fec_get_hwaddr(edev, ethaddr) == 0) {
>> -		printf("got MAC address from EEPROM: %pM\n", ethaddr);
>> -		memcpy(edev->enetaddr, ethaddr, 6);
>> -		fec_set_hwaddr(edev);
>> +	if (!eth_getenv_enetaddr("ethaddr", ethaddr)) {
>> +		/* "ethaddr" is not set in the environment */
>> +		if (fec_get_hwaddr(edev, ethaddr) == 0) {
>> +			printf("got MAC address from EEPROM: %pM\n", ethaddr);
>> +			eth_setenv_enetaddr("ethaddr", ethaddr);
>> +		} else {
>> +			printf ("no MAC found\n");
>> +			return -1;
>> +		}
>>  	}
>> +	memcpy(edev->enetaddr, ethaddr, 6);
>> +	fec_set_hwaddr(edev);
>>
>>  	return 0;
>>  }
> 
> As I understood Ben's comment on my last patch, the driver must not
> touch any environment variable, that is it must not call any
> getenv/setenv function.
> 
> See http://www.mail-archive.com/u-boot at lists.denx.de/msg28329.html

Huh, didn;t see your patch ... sorry!

Hmm.. but if u-boot didn;t use this interface, linux never get
the mac address stored in ethaddr ... so, if using in u-boot
network, linux see/uses the mac address from environment, if
not using network in u-boot, linux uses the mac address stored
in eeprom ...

and if no valid mac address is in eeprom, linux has no valid
mac address, if u-boot don;t uses the interface ...

If I look in the code drivers/net/fec_mxc.c fec_get_hwaddr():

if defined CONFIG_MX51 this function _always_ returns -1, so
if not using this interface, on MX51 based plattforms, the
mac address is never initialized ...

How works this on such plattforms?

bye
Heiko
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