Hello,
I found the ibm_newemac driver(2.6.29) makes the assumption that the
bootloader has already configured the tx enable pin as it is a
multiplexed pin. Unfortuantley I am not using U-Boot and our minimal
bootloader does not do this. After finding tx enable was never
asserting for Eth0 a quick user space program verified tx enable was
configured as a GPIO pin.
I would like to eventually submit our changes for upstream support. Based on
this would you recommend ensuring tx enable is configured properly in the
initialization of the ibm_newemac driver or the platform initialization?
On Tue, Apr 7, 2009 at 9:32 AM, Eddie Dawydiuk <ed...@embeddedarm.com>
wrote:
Hello,
I'm working on a board based on the Yosemite AMCC 440EP eval board. I'm
having some difficulty getting both network interfaces working. The
first
problem I found is the ibm_newemac driver was detecting the two phys at
address 0 and 1 where we have them wired for addresses 1 and 3. As a
result
I hardcoded the phy-address in the dts file. I then found I was able to
receive and send data on eth1(phy-address 3) without incident.
Although I
found eth0 can receive data but I see no packets being
transmitted(using a
packet sniffer) and I see no indication from a software standpoint of
any
transmit failures. We are using Micrel KSZ8041FTL phys(RMII mode)
where the
Yosemite board used Micrel KS8721BL phys. I've reviewed the
schematic and
it appears both phys are connected identically and I've seen this same
failure on multiple boards. I thought the fact that the driver
detected a
phy at address 0 might be a clue, but I can't make much of the clue.
So I
thought I'd post this info in the hopes someone else might have run
into a
similar problem or have a suggestion.
Phy address 0 is the broadcast address. All phys will usually respond
to address 0 accesses. Off the top of my head, It sounds like one PHY
is responding to addresses 0 & 1, and the other phy isn't responding
at all.
g.
--
Best Regards,
________________________________________________________________
Eddie Dawydiuk, Technologic Systems | voice: (480) 837-5200
16525 East Laser Drive | fax: (480) 837-5300
Fountain Hills, AZ 85268 | web: www.embeddedARM.com
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