[U-Boot-Board-Maintainers] Raspberry pi 4 - u-boot - genet / scb

[Matthias Brugger]

Adding Andre as he helps in the effort to port the driver. More comments inline.

On 19/11/2019 22:46, Heinrich Schuchardt wrote:
> On 11/19/19 9:48 PM, Simon Glass wrote:
>> Hi Sascha,
>>
>> On Tue, 19 Nov 2019 at 10:10, Sascha Dewald <sascha.dewald at gmail.com> wrote:
>>>
>>> Hi Simon,
>>>
>>> it uses bcmgenet.
>>>
>>> Below some information from "hwinfo" and "dmesg"
>>>
>>
>> OK, well I think this is in linux as drivers/net/ethernet/broadcom/genet
>>
>> I'm not sure about the PHY but it looks like there is no driver for
>> genet in U-Boot. I suggest poriting it over.
> 
> In linux-next/next-20191119
> arch/arm64/boot/dts/broadcom/bcm2711-rpi-4-b.dtb
> there is no network device.
> 

Florian send a new pull request, I think yesterday which adds the genet driver
to RPi4.

> On Raspbian you can find for RPi4:
> 
> compatible = "brcm,genet-v5"
> relating to Linux drivers/net/ethernet/broadcom/genet/bcmgenet.c
> CONFIG_BCMGENET "Broadcom GENET internal MAC support"
> 

RPi4 is a special case as DMA burst size is different from plain genet-v5
driver. But that might be of no relevance for U-Boot.

Regards,
Matthias

> compatible = "ethernet-phy-ieee802.3-c22";
> relating to Linux drivers/of/of_mdio.c.
> CONFIG_OF_MDIO OpenFirmware MDIO bus (Ethernet PHY) accessors
> 
> compatible = "brcm,genet-mdio-v5";
> relating to Linux drivers/net/phy/mdio-bcm-unimac.c
> CONFIG_MDIO_BCM_UNIMAC "Broadcom UniMAC MDIO bus controller"
> 
> So wouldn't we need all three drivers?
> 
> Maybe Joe can tell us.
> 
> Best regards
> 
> Heinrich
> 
> 
>>
>> Regards,
>> Simon
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