network management in Linux

Vladimir Karakozov

Hi, all!

I have custom board with micrel PHY KSZ9021GN. There is some hardware problem on board schematic, and my ethernet interface can operate only at 10 MBps. In u-boot I disable negotiation on PHY, set fixed speed to 10 MBps and modify ethernet driver. I can use network on u-boot stage. But when linux kernel start it is reset all my settings to default and can't tuned PHY. Here Linux boot messages:

net eth0: attached PHY driver [Micrel KSZ9021 Gigabit PHY] (mii_bus:phy_addr=0:)
ADDRCONF(NETDEV_UP): eth0: link is not ready
davinci_mdio davinci_mdio.0: resetting idled controller
Sending DHCP requests ...... timed out!
IP-Config: Reopening network devices...
net eth0: attached PHY driver [Micrel KSZ9021 Gigabit PHY] (mii_bus:phy_addr=0:)
ADDRCONF(NETDEV_UP): eth0: link is not ready
davinci_mdio davinci_mdio.0: resetting idled controller
Sending DHCP requests ...... timed out!
IP-Config: Auto-configuration of network failed.

Please, explain me:

- how to disable auto negotiation in linux network driver?

- how I can set fixed network speed value in linux?

Thank you!

P.S. Sorry for my English

over 13 years ago

0 Kirill Brilliantov over 13 years ago

Genius 3510 points

Hello, idle!

I see three ways:
1. change driver
2. use http://linuxcommand.org/man_pages/ethtool8.html
3. use interface for your programming language, eg. ioctl

0 Vladimir Karakozov over 13 years ago in reply to Kirill Brilliantov

Expert 2285 points

Hi, Kirill!

Thank you for your answer!

In file linux/drivers/net/phy/phy_device.c in function phy_device_create() I set hook:

dev->autoneg = AUTONEG_DISABLE;

My problem was solved and I can continue work with network in Linux at 10 MBps.

Thank you for all!

0 Kirill Brilliantov over 13 years ago in reply to Vladimir Karakozov

Genius 3510 points

Hi, idle!

I think you select fast, but not very good way, if you must work only with 10 Mb/s I suggest another ways:
1. change board design
2. configure autonegotiation only on 10 Mb/s

0 Vladimir Karakozov over 13 years ago in reply to Kirill Brilliantov

Expert 2285 points

Yes. Kirill, you are right!

We plan work with 10/100/1000 Mb/s. But can't connect PHY properly, or PHY don't work properly with processors EMAC. Perhaps, we need change KSZ9021GN on the other PHY. If you can help with schema of hardware connection between PHY and EMAC, I can provide hardware connections details. May be someone use this PHY on C6A8168 processor. All threads on this forum about KSZ9021GN I was read and but no result :(

Thank you again.

0 Kirill Brilliantov over 13 years ago in reply to Vladimir Karakozov

Genius 3510 points

Hello, idle!

Sorry, we are not work with this PHY. But I configure Marvell 88E1111 on DM36x procesor for work maximum on 100 Mb/s.

Processors

Processors forum

network management in Linux