Re: configure the mac address of an eth device

[Giorgio Dal Molin <giorgio.nicole@arcor.de>]

Hi Sascha,

thank you for your suggestion about the MAC, the code works now as expected.

Just another quick question: is there a function like of_eth_register_ethaddr()
also for a 'serial-number' value ?

I also have a 'serial number' value from the eeprom and I would like to pass to the kernel.
Just calling something like:

of_set_property(of_get_root_node(), "serial-number", s, strlen(s) + 1, 1);

does not work because it changes only the device tree for barebox but not that
for the kernel. So I registered an of fixup:

of_register_fixup(samx7_board_fixup, s);

for it and it works then but it is a bit more complex.

giorgio

> On May 25, 2020 at 8:01 AM Sascha Hauer <s.hauer@pengutronix.de> wrote:
> 
> 
> Hi Giorgio,
> 
> On Sun, May 24, 2020 at 01:57:08PM +0200, Giorgio wrote:
> > Hi,
> > 
> > I'm working with an arm som with an imx7d soc on it.
> > The som also has an eeprom with some module specific manufacturer parameters
> > like two MAC address, for eth0 and eth1, a module description string or a module
> > serial number.
> > I've now added some code to my board.c to extract the strings from the eeprom and now
> > I need to actually configure the MAC addresses from them, to avoid barebox choose
> > random ones when it needs the eth's.
> 
> Use of_eth_register_ethaddr(). It will do two things for you. First it
> will let the ethernet device come up with the right MAC address under
> barebox. Also it will add the "mac-address" property to the device tree
> passed to Linux.
> 
> Sascha
> 
> 
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