[U-Boot] U-boot timeout with KSZ8021 phy

[Marek Vasut]

Dear Alexandre Pereira da Silva,

> On Thu, Jul 11, 2013 at 4:55 PM, Marek Vasut <marex at denx.de> wrote:
> > Dear Alexandre Pereira da Silva,
> > 
> >> Hi,
> >> 
> >> I am trying to make my ethernet work with u-boot on a custom IMX28
> >> board.
> >> 
> >> This board uses the micrel KSZ8021 phy.
> >> 
> >> The network works fine on linux but won't work properly on u-boot.
> >> 
> >> Here is the output:
> >> => dhcp
> >> BOOTP broadcast 1
> >> DHCP client bound to address 192.168.1.103
> >> Using FEC device
> >> TFTP from server 192.168.1.54; our IP address is 192.168.1.103
> >> Filename 'uImage'.
> >> Load address: 0x42000000
> >> Loading: T T T T
> >> 
> >> I am using the apx4devkit board configuration
> > 
> > Seems unmaintained :-(
> > 
> >> as a base for my port,
> >> but adapted the phy setting to the KSZ8021 needed value. If that phy
> >> configuration value is wrong, it doesn't even get an IP address from
> >> DHCP.
> >> 
> >> Marek's patch about cache didn't help much in my case.
> > 
> > Try "dcache off" on command line, do you have any luck then ?
> 
> dcache off doesn't help either.
> 
> > Also try copying the network section from M28EVK, as M28EVK uses KSZ8021
> > PHYs. I also noticed the M28EVK resets the PHYs, so maybe you need to
> > handle that ? On M28EVK this is handled in board/denx/m28evk/m28evk.c
> 
> By mistake, I forgot to add reset pin for the phy, so I am leaving the
> phy always enabled.

You really should reset it upon boot, it might be in some confused state.

> I did try using M28EVK and MX28EVK board ports as well, but none worked so
> far.

Can you elaborate?

> Do I have do anything special for the NC pins of IMX280?

No, just make sure your ethernet pinmux is correct too.

> > Moreover, check if your CLKCTRL ENET settings are correct, that's also
> > handled in the same function as the PHY reset on M28EVK I think (or at
> > least in the same section).
> 
> That doesn't seem to be wrong. I see a clean 50MHZ clock on that pin.

Make sure to check the direction too, it can go either from phy to fec or the 
other way IIRC.

Best regards,
Marek Vasut