[U-Boot-Users] Problem with MPC8272ADS FCC Ethernet TX at 10 Mb/s half-duplex

[Martin Jolicoeur]

Hi Tien,

Thanks for the reply. No, you are correct the phy code
is not enabled in u-boot. My understanding of the phy
support is that it is required to handle link events
(up/down), speed and duplex changes. If the board is
started already connected to a hub, the phy should
initialize at the correct speed and duplex.

Also I noticed that u-boot configures the FCC in
full-duplex mode which is probably the issue. Looking
at the kernel code, it seems I need to configure the
FCC to half-duplex for this to work.

While looking at this, I also stumbled on the CPM119
ucode patch from freescale which solves a collision
issue that can cause the FCC transmit to halt. I am
curious as to the relevance of this patch to this type
of application.

Martin


--- "Nghiem, Tien" <TNghiem at oerlikon.ca> wrote:
> Martin,
> 
> Check if the mii_discover_phy() is enable in the
> u-boot code.
> 
> Tien
> 
> -----Original Message-----
> From: u-boot-users-admin at lists.sourceforge.net
> [mailto:u-boot-users-admin at lists.sourceforge.net]On
> Behalf Of Martin
> Jolicoeur
> Sent: Tuesday, March 08, 2005 6:02 PM
> To: u-boot-users at lists.sourceforge.net
> Subject: [U-Boot-Users] Problem with MPC8272ADS FCC
> Ethernet TX at 10
> Mb/s half-duplex
> 
> 
> 
> We seem to be having a problem with the MPC8272ADS
> board when connected to a hub (10 Mb/s half-duplex).
> u-boot is not able to ping anything. As anyone seen
> this problem? It looks like its a hardware problem
> (PHY or FCC) but I am curious as anyone been able to
> use this board with 10 Mb/s half-duplex hub?
> 
> Thanks
> Martin
> 
> 
> 
> 	
> 		
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