-----Original Message----- From: Stefan Roese [mailto:sr@denx.de] Sent: Thursday, July 23, 2009 11:57 AM To: u-boot@lists.denx.de Cc: Prafulla Wadaskar; Ben Warren; Ashish Karkare; Prabhanjan Sarnaik Subject: Re: [U-Boot] FW: ARM Pull Request
On Thursday 23 July 2009 08:16:47 Prafulla Wadaskar wrote:
I'm working on the repo right now and should have another pull request soon. The 'forced interface' patch is still contentious, so isn't included.
Okay With this for RD6281 Build will not fail, but network will
be broken.
Meanwhile I will check why auto negotiation doesn't work on
this board?
Did you check if Lennert's comments are correct?
Dear Stefan Yes, I have checked.
Quote:
Isn't it just because on the RD6281A, the first ethernet MAC of the CPU is connected to an ethernet switch chip instead of an
ethernet PHY,
and therefore there is no negotiation to be done?
But auto negotiation works with other board for similar case (i.e. mv88f6281gtw_ge) Only the difference is on rd6281A multichip addressing mode is used. I cannot comment much on this at this moment, this is my observation. So I was planning to debug this part.
(The second MAC
is connected to a PHY directly, so that one should just use autoneg.)
Yes, this is functional on egiga1
Even on the RD6281Z, we should just force the ethernet MAC to a fixed speed/duplex, since even though PHY polling might work there, we'll be talking to the PHY corresponding to the first switch port, which means that you might not be able to tftp from the second switch port or so if there's nothing plugged into the first one.
FWIW, the linux kernel port also forces 1000/full on the CPU
MACs where
a switch chip is connected. On those CPU MACs where there
is a switch
chip connected, the (R)(G)MII interface becomes purely a bus to transport packets into and out of the crossbar, one that is
always up.
So, is this ethernet port in question connected to switch? Then a forced link (highest speed) should be used.
This is what I was trying to do, but it was through CONGIF_ options and that is applied to both ports, in case we need to force link speed then I need to provide some configurable interface for u-boot kirkwood egiga driver.
Regards.. Prafulla . .
Best regards, Stefan
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