[U-Boot] [PATCH v7 00/15] SiFive FU540 Support

[Anup Patel]

On Wed, Feb 13, 2019 at 7:01 AM Bin Meng <bmeng.cn at gmail.com> wrote:
>
> On Tue, Feb 12, 2019 at 6:23 PM Andreas Schwab <schwab at suse.de> wrote:
> >
> > On Feb 12 2019, Bin Meng <bmeng.cn at gmail.com> wrote:
> >
> > > The env var is stored in whatever supported media in U-Boot. Not like
> > > PCI NICs which normally have EEPROM to store pre-flashed MAC address
> > > by their vendors, for most embedded network controllers in the SoC,
> > > normally there is no hardware provided mechanism to ensure a unique
> > > MAC address, instead it relies on software to program one to the
> > > hardware before bringing it up.
> >
> > On the Hifive the MAC is part of the initial DT, so there is no need to
> > use a secondary store.
> >
>
> So for the HiFive board, who is supposed to guarantee the uniqueness
> of the MAC address? Does SiFive program DT with different MAC to every
> board they shipped? If so, we can just read  "local-mac-address" from
> DT in U-Boot.

General practice (atlease what I have seen on few boards), is that board
will have unique MAC address printed/labelled for each Ethernet port. We
can just set-and-save "ethaddr" U-Boot env variable based on MAC address
printed on board.

Unfortunately, I was not able to find printed MAC address on Unleashed board.

Regards,
Anup