starting ethernet switch in SMI mode

starting ethernet switch in SMI mode

[Vanalme Filip]

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Hi,

On our board with i.MX27 processor, we have a Micrel 5-port Managed Ethernet switch (ksz8895mq). When starting in normal MII mode, from the Barebox prompt, I can get an IP address by executing the dhcp command.
When I change the switch's mode to SPI (via hardware strapping), I'm not able to get an IP address anymore via DHCP. In this mode, one has to write to a register in the switch to make the switch start. So, within our startup code, I added some code to start the switch. Reading back the register, I see that the bit is set, so I assume the switch sould be running at that moment. However, when executing the dhcp command, I get "phy0: Autonegotiation timeout".
That's strange, because, when I boot to Linux kernel, the kernel starts up without any problem and gets an IP address via DHCP. So in Linux, it's doing OK.
Because it is working in Linux, I'm quite sure the switch was started in a correct way.
I don't understand why Barebox is unable to contact the switch while there's no problem in Linux to do the same. Anyone any idea on this problem ?

Thanks in advance !

Filip

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Filip Vanalme

Senior Development Engineer





Tel. +32 51 30.30.45

Fax +32 51 33.18.86

www.televic.com





Televic NV * Leo Bekaertlaan 1 * 8870 Izegem * Belgium
Company number 0402.757.955 * RPR Kortrijk




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Re: starting ethernet switch in SMI mode

[Sascha Hauer]

On Wed, Jul 04, 2012 at 01:53:39PM +0200, Vanalme Filip wrote:
> Hi,
> 
> On our board with i.MX27 processor, we have a Micrel 5-port Managed
> Ethernet switch (ksz8895mq). When starting in normal MII mode, from
> the Barebox prompt, I can get an IP address by executing the dhcp
> command.  When I change the switch's mode to SPI (via hardware
> strapping), I'm not able to get an IP address anymore via DHCP. In
> this mode, one has to write to a register in the switch to make the
> switch start. So, within our startup code, I added some code to start
> the switch. Reading back the register, I see that the bit is set, so I
> assume the switch sould be running at that moment. However, when
> executing the dhcp command, I get "phy0: Autonegotiation timeout".
> That's strange, because, when I boot to Linux kernel, the kernel
> starts up without any problem and gets an IP address via DHCP. So in
> Linux, it's doing OK.  Because it is working in Linux, I'm quite sure
> the switch was started in a correct way.  I don't understand why
> Barebox is unable to contact the switch while there's no problem in
> Linux to do the same. Anyone any idea on this problem ?

Have you tried ignoring the return result from miidev_wait_aneg? I
assume barebox just can't communicate with the phy because the phy is in
SPI mode.

Sascha


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