RE: Linux w/ML403 PLB TEMAC

[Glenn.G.Hart@us.westinghouse.com]

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Ming/Rick,

I tried setting the speed to 1000 as below, but it did not change the
result.  I also tried Rick's new adapter.c with the same results.  Changing
the hard_temac_v3_b to hard_temac_v3_a was the change I needed.
Unfortunately, the speed of the network is much slower now.  I switched to
DMA and then changed the Linux drivers for the DMA & TEMAC v2 to v3.

I have my own program to test performance.  It seems everything is so slow
it does not every complete to give me the statistics.  My ping are also
slower.  I used to be able to ping my computer and get 0.6-0.7 ms times.
With the DMA and TEMAC v3 I am now getting 1.8 ms times.

I am now not sure if it is my build or my PPC design.  For the PPC design I
have a minimum PPC with OPB-RS232, PLB-DDR, and PLB-TEMAC.  I use all the
defaults from BSB except I check use interrupt on the RS232 and TEMAC.

Any suggestions?

Thanks,
Glenn



                                                                                                     
 (Embedded     "Ming Liu" <eemingliu@hotmail.com>@ozlabs.org                                         
 image moved   02/12/2007 11:48 AM                                                                   
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Sent by:
       linuxppc-embedded-bounces+glenn.g.hart=us.westinghouse.com@ozlabs.org


To:    Glenn.G.Hart@us.westinghouse.com
cc:    linuxppc-embedded@ozlabs.org
Subject:    RE: Linux w/ML403 PLB TEMAC

Security Level:?              Internal


Dear Glenn,

>3.  The speed of the network was very poor.  I wanted to implement DMA for
>the TEMAC.  I created a new PPC with BSB using DMA on the TEMAC.  Kernel
>recompilied without a problem, but upon starting the kernel I got:

In fact, the old cores of TEMAC(plb_temac 2.00 & hard_temac 1.00) also
support DMA. But of course the 3.00 cores are prefered because of other
improved features.

>6.  I am using busybox 1.2.1 which worked fine previously configuring the
>network.  Now when I execute ifconfig I get the following problem:
>[   12.228721] eth0: XTemac: Options: 0xb8f2
>[   24.197749] eth0: XTemac: Not able to set the speed to 1000 (status:
>0x148)
>[   34.215593] eth0: XTemac: Not able to set the speed to 100 (status:
>0x148)
>[   44.232349] eth0: XTemac: Not able to set the speed to 10 (status:
>0x148)
>[   44.313727] eth0: XTemac: could not negotiate speed
>[   44.372226] eth0: XTemac: Send Threshold = 16, Receive Threshold = 2
>[   44.448421] eth0: XTemac: Send Wait bound = 1, Receive Wait bound = 1
># [   57.180152] eth0: XTemac: PHY Link carrier lost.

I also had such a problem before. To solve such a problem most quickly, you
can just specify a fixed speed (like 1000Mbps) in adapter.c file. In this
file, after the line of "/* Get current link speed */ (around L378) and
"phylinkspeed = (RegValue & MARVELL_88E1111_LINKSPEED_MARK)>>
MARVELL_88E1111_LINKSPEED_SHIFT;", I just add and specify the speed as
"phylinkspeed = MARVELL_88E1111_LINKSPEED_1000M;" Of course with this
method, the speed cannot be auto-negotiated any more.

Another hints: I remember that there is another post from Rick on the
updated "adapter.c" a few days ago. Maybe that could solve your problem. I
didn't try that before. So if you will try, pls let us know the result. :)

BR
Ming

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