How to retrieve cpu info from u-boot fucntion?

[Sourabh Hegde Ramu]

Hi,

Thanks for the update.

I was testing the Raspberry Pi 5 with u-boot and noticed I get below error
regarding MAC address

bcm2835: Could not query MAC address
Net:   No ethernet found.

Is this because of a missing implementation of Pi5 network hardware?

Thanks again!

On Thu, Aug 29, 2024 at 10:05 AM Peter Robinson <pbrobinson at gmail.com>
wrote:

> Hi Sourabh,
>
> > Thanks for the update. Looking at the board/raspberrypi/rpi/rpi.c I
> think MAC address is only returned for models that have onboard ethernet.
> but for models raspberry pi 0w / pi 02w it might not return any value.
> > Am I correct? (maybe I overlooked it?) Is there any other approach for
> this?
>
> TBH I have no idea, in a lot of cases the MACs are written to SoCs
> long before they end up in a final product so they may well be there.
>
> I have not tried, I was merely pointing out to you possible solutions
> for you to try. I don't have the original pi0 but I also gave you
> other possible ways to solve you're problem :)
>
> > Thanks in advance
> >
> > On Wed, Aug 28, 2024 at 5:31 PM Peter Robinson <pbrobinson at gmail.com>
> wrote:
> >>
> >> Hi,
> >>
> >> I appear to have missed the first post.
> >>
> >> > Is there any update on the below request? Are there any functions
> similar
> >> > to eth_get_ethaddr() to retrieve device-specific info? I am working
> with
> >> > raspberry pi 0 and there is no network interface card.
> >> > So, eth_get_ethaddr() returns null
> >>
> >> So there's a bunch of drivers for OTP/eFuses in drivers/misc/* which
> >> provide access to those sort of unique options such as CPU serial
> >> numbers, and possibly stored MACs etc.
> >>
> >> I know the RPi has a OTP/eFUSE HW IP block, I don't believe U-Boot has
> >> a driver for that as yet.
> >> The main RPi firmware may have an mbox/API for querying those sorts of
> >> things, looking at board/raspberrypi/rpi/rpi.c there's a
> >> set_usbethaddr which calls a msg_get_mac_address to request a MAC from
> >> the RPi firmware, I suspect that may work for your needs.
> >>
> >> Peter
> >>
> >> > Thanks in advance
> >> >
> >> > On Wed, Jun 19, 2024 at 9:11 AM Sourabh Hegde Ramu <
> hrsourabh1107 at gmail.com>
> >> > wrote:
> >> >
> >> > > Hello,
> >> > >
> >> > > Currently, I am using the MAC address from eth_get_ethaddr()
> function to
> >> > > calculate a hash value. But, I would like to replace this with a
> more
> >> > > unique device info such as cpuid or other values. But I could not
> find any
> >> > > function that can retrieve cpu info.
> >> > >
> >> > > Can anyone please point me in the correct direction? Do we have any
> >> > > functions for this? Are these things part of the documentation?
> >> > >
> >> > > Thanks in advance.
> >> > >
> >> > > Kind regards,
> >> > > Sourabh
> >> > >
>