fads823 ethernet interface does (seams) not send data

fads823 ethernet interface does (seams) not send data

[raphael.bossek]

hi,

my fads823 pilot board now boots from flash based on the 8xxrom 
from Magnus Damm (my patches will be made public soon or write 
me) and the NFS configuration is up. the ethernet ligts on the board 
show that the chip is initialised. Link and Rx lights are flashing but 
the Tx does not... are there any patches ?

i'm using the embedded-2.2.13 with some patches from Magnus 
Damm and other people... compiled with NFSROOT and ethernet at 
SCC2 and so on... linux boots preaty well :-) but the ethernet seams 
buggy...

thx

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Re: fads823 ethernet interface does (seams) not send data

[kd]

Hi,

I am just speculating here (because I have similar problems with 2.2.13
(very slow ethernet with problems of lost packages somewhere)).......

Is it possible that this has something to do with the microcode patch
presented in 2.213?

K.D.


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Re: fads823 ethernet interface does (seams) not send data

[Dan Malek]

kd@flaga.is wrote:


> Is it possible that this has something to do with the microcode patch
> presented in 2.213?


No, it has nothing to do with that.  It is only skeleton code
that someday may perform a patch.  The drivers are not yet
updated to handle it.  The microcode patches either work
correctly or not at all, there is no in between.

I have never used an SCC Ethernet on the FADS, but there must
be control register bits or other 8xx general purpose I/O
pins that are required to be set correctly for the Ethernet PHY
to operate correctly.  You have to also make sure all of the
SCC clock and I/O pins are properly configured for the hardware
design.  I can guarantee some of this may not be correct for
the 823 FADS, as all boards seem to use something different.

The 8xx SCC Ethernet driver will only run on half duplex mode.
There is no auto sensing like is provided on (some) FEC 10/100
Ethernet PHYs.  The SCC (and FEC) has to be configured differently
for half or full duplex operation.


	-- Dan

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Re: fads823 ethernet interface does (seams) not send data

[Richard Hendricks]

The problem may lie with the multiplexing of the pins for the (not
availible) softmodem.  The short story is to look at page 6 of 9 of the
MPC823FADSDB schematics. That 74LCX257 does some routing control of
various signals, and may be causing some confusion and pain.  The MPC823
FADS User's Manual should also have a picture on page 4-7 and a
discussion on page 4-6 about this "feature".  The important thing is the
picture, it shows how all the signals are REALLY connected between the
daugthercard and motherboard.

In your case, you'll notice that the PA7/ETHTCK from the motherboard is
really connected to PA5/ETHTCK on the daughtercard.  I have seen
Ethernet working on the MPC823FADS board, so I know it CAN be done.

Dan Malek wrote:
> 
> kd@flaga.is wrote:
> 
> > Is it possible that this has something to do with the microcode patch
> > presented in 2.213?
> 
> No, it has nothing to do with that.  It is only skeleton code
> that someday may perform a patch.  The drivers are not yet
> updated to handle it.  The microcode patches either work
> correctly or not at all, there is no in between.
> 
> I have never used an SCC Ethernet on the FADS, but there must
> be control register bits or other 8xx general purpose I/O
> pins that are required to be set correctly for the Ethernet PHY
> to operate correctly.  You have to also make sure all of the
> SCC clock and I/O pins are properly configured for the hardware
> design.  I can guarantee some of this may not be correct for
> the 823 FADS, as all boards seem to use something different.
> 
> The 8xx SCC Ethernet driver will only run on half duplex mode.
> There is no auto sensing like is provided on (some) FEC 10/100
> Ethernet PHYs.  The SCC (and FEC) has to be configured differently
> for half or full duplex operation.
> 
>         -- Dan

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Re: fads823 ethernet interface does (seams) not send data

[Jason.Work]

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"In your case, you'll notice that the PA7/ETHTCK from the motherboard is
really connected to PA5/ETHTCK on the daughtercard.  I have seen
Ethernet working on the MPC823FADS board, so I know it CAN be done."

I've got half-duplex communication over SNI working but now I want to move 
to full-duplex.  My changes are not working.  Have you seen this done 
successfully?

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