UBL/U-BOOT and MARVELL LINK STREET

[Marek Behun]

:)

1. this is really old U-Boot
2. even current U-Boot does not have a full driver for Link Street
   switches. Your version from 2010.12 probably does not have this
   driver at all, so you are basically stuck with the automatic
   settings the switch got on reset
3. initialization of Link Street switches is not as straightforward
   - one question is which addressing mode are you using: Link Street
     switches can expose the register space directly on all the
     addresses on the MDIO bus (Single Chip Addressing Mode), or
     indirectly to only one MDIO address (Multi Chip Addressing Mode).

     In this Multi Chip Addressing Mode you access the Switch internal
     registers via MDIO registers 0x00 (SMI Command Register) and 0x01
     (SMI Data Register)

My advice is to read the corresponding documentaion and upgrade to
current U-Boot.

Marek

On Tue, 2 Mar 2021 17:42:31 +0000
Mark Stolp <Mark.Stolp at clearone.com> wrote:

> We have a problem where DHCP fails at the U-Boot prompt. My version of U-Boot is as follows:
> 
> `U-Boot 2010.12-00000-gadf5366 (Jul 20 2016 - 16:29:05)
> 
> We have switched from a LAN8710 to a Marvell Link Street 88E6352 part. It appears to me that the initialization of the PHY is failing. This is what I get when I run 'mii dump 0 0'
> 
> 
>  1.      (0000)                                     -- PHY control register -
> 
> I need that register to be 3100 or something like that. I would like to know if my UBL should handle the Marvell part or not. And, how I can fix this problem.
> 
> Thanks,
> Mark
> 
> 
> Mark Stolp  Senior Firmware Engineer
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