linux-kernel - Re: [PATCH v2] ARM: dts: exynos: Add a placeholder for a MAC address

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Message-ID: <CANAwSgR=20AOVxi=5L_ep=uK98dzL6Ent52Mux1_iviiK-XGPA@mail.gmail.com>
Date:   Thu, 5 Nov 2020 13:36:53 +0530
From:   Anand Moon <linux.amoon@...il.com>
To:     Marek Szyprowski <m.szyprowski@...sung.com>
Cc:     Łukasz Stelmach <l.stelmach@...sung.com>,
        Rob Herring <robh+dt@...nel.org>,
        Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-samsung-soc@...r.kernel.org,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: Re: [PATCH v2] ARM: dts: exynos: Add a placeholder for a MAC address

Hi Marek,

On Mon, 2 Nov 2020 at 21:53, Marek Szyprowski <m.szyprowski@...sung.com> wrote:
>
> Hi Anand,
>
> On 01.11.2020 15:07, Anand Moon wrote:
> > Hi Lukasz,
> >
> > On Thu, 1 Oct 2020 at 19:25, Łukasz Stelmach <l.stelmach@...sung.com> wrote:
> >> Add a placeholder for a MAC address. A bootloader may fill it
> >> to set the MAC address and override EEPROM settings.
> >>
> >> Signed-off-by: Łukasz Stelmach <l.stelmach@...sung.com>
> >> ---
> >> Changes in v2:
> >>   - use local-mac-address and leave mac-address to be added by a bootloader
> >>
> >>   arch/arm/boot/dts/exynos5422-odroidxu3.dts | 18 ++++++++++++++++++
> >>   1 file changed, 18 insertions(+)
> >>
> >> diff --git a/arch/arm/boot/dts/exynos5422-odroidxu3.dts b/arch/arm/boot/dts/exynos5422-odroidxu3.dts
> >> index db0bc17a667b..d0f6ac5fa79d 100644
> >> --- a/arch/arm/boot/dts/exynos5422-odroidxu3.dts
> >> +++ b/arch/arm/boot/dts/exynos5422-odroidxu3.dts
> >> @@ -70,3 +70,21 @@ &pwm {
> >>   &usbdrd_dwc3_1 {
> >>          dr_mode = "peripheral";
> >>   };
> >> +
> >> +&usbhost2 {
> >> +       #address-cells = <1>;
> >> +       #size-cells = <0>;
> >> +
> >> +       hub@1 {
> >> +               compatible = "usb8087,0024";
> >> +               reg = <1>;
> >> +               #address-cells = <1>;
> >> +               #size-cells = <0>;
> >> +
> >> +               ethernet: usbether@1 {
> >> +                       compatible = "usb0c45,6310";
> >> +                       reg = <1>;
> >> +                       local-mac-address = [00 00 00 00 00 00]; /* Filled in by a bootloader */
> >> +               };
> >> +       };
> >> +};
> >> --
> >> 2.26.2
> >>
> > Thanks for this patch, can you share some example on how to set the
> > mac address via u-boot bootargs
>
> A little bit hacky script to set permanent board unique MAC address:
>
> # setexp.b u0 *0x10000014; setexp.b u1 *0x10000015; setexp.b u2
> *0x10000016; setexp.b u3 *0x10000017; setenv ethaddr
> 0:0:${u0}:${u1}:${u2}:${u3}; setenv usbethaddr ${ethaddr};
>
OK this command worked for me.

> Then if there is proper ethernet0 alias set, u-boot will then
> automatically save the configured MAC address to the device tree. I've
> just check this on recent u-boot v2020.10 and Odroid U3 board.
>
> Lukasz will send updated patch soon (with proper alias entry).
>
> If you want to hack setting MAC address manually, this will work with
> the current patch:
>
> # setexp.b u0 *0x10000014; setexp.b u1 *0x10000015; setexp.b u2
> *0x10000016; setexp.b u3 *0x10000017; fdt addr ${fdtaddr}; fdt set
> /soc/usb@...10000/hub@...sbether@1 local-mac-address [ 0 0 ${u0} ${u1}
> ${u2} ${u3} ]
>

So do we need a similar patch for u-boot ?
I am getting following error on Odroid U3+ and U-Boot 2020.10

Odroid #  setexp.b u0 *0x10000014; setexp.b u1 *0x10000015; setexp.b
u2 *0x10000016; setexp.b u3 *0x10000017; fdt addr ${fdtaddr}; fdt set
/soc/usb@...10000/hub@...sbether@1 local-mac-address [ 0 0 ${u0} ${u1}
${u2} ${u3} ]
No FDT memory address configured. Please configure
the FDT address via "fdt addr <address>" command.
Aborting!

Also added these command to boot.scr but still observing the failure

mmc0(part 0) is current device
Scanning mmc 0:1...
Found U-Boot script /boot/boot.scr
969 bytes read in 5 ms (188.5 KiB/s)
## Executing script at 42000000
7341440 bytes read in 265 ms (26.4 MiB/s)
53875 bytes read in 56 ms (939.5 KiB/s)
7964187 bytes read in 285 ms (26.6 MiB/s)
libfdt fdt_path_offset() returned FDT_ERR_NOTFOUND
Kernel image @ 0x41000000 [ 0x000000 - 0x700580 ]
## Flattened Device Tree blob at 40800000
   Booting using the fdt blob at 0x40800000
   Loading Ramdisk to 4f867000, end 4ffff61b ... OK
   Loading Device Tree to 4f856000, end 4f866272 ... OK
,
Best Regards
-Anand

> > also can you update this patch for exynos5422-odroidxu3-lite.dts and
> > exynos4412-odroidu3.dts.
>
> Also odroid-x2 and odroid-xu. Lukasz will take care of them.
>
> Best regards
>
> --
> Marek Szyprowski, PhD
> Samsung R&D Institute Poland
>