Re: MII command to read and write specific registers

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On Thu, 11 Jul 2019 15:30:01 +0200
Benjamin Beckmeyer <beb@xxxxxxxxxxxx> wrote:

> Hey all,
> is there a possibility to read/write specific registers from/to different MII addresses?
> 
> I know that there is miitool but it just can give me the first 16 registers of a PHY.
> But I need write specific registers e.g. MII addr 2 register 0 and read MII addr 2 
> register 1. I know uboot is having the mii command(exactly what I would need), and I 
> have seen that there were parameters for address and register in miitool but they 
> were deleted lastly.
> 

Hi Benjamin!

You can use /dev/mdio* devices for reading/writing MII registers.
E.g.
  md -s /dev/mdio0-phy00
  mw -d /dev/mdio0-phy00 -w 0 0x12345678

Just after barebox boot there is no /dev/mdio* devices.
After network interface initialization (e.g. after ifup command) or
after miitool command  the /dev/mdio* devices appear.

-- 
Best regards,
  Antony Pavlov

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