[U-Boot] UEC phy not working on first try

[U-Boot] UEC phy not working on first try

[DUNDA Matthias]

Hi all-

I am using u-boot.2010.09 on a MPC8568-based board.

When trying to boot over one of the UEC network interfaces, it is not working instantly. The cable is connected from the beginning, but I have to issue a manual 'boot' command, sometimes even multiple times before the link is correct. This is the output:

[----------------------------- snip -----------------------------]
Net:   UEC0, UEC1, UEC3 [PRIME], eTSEC0, eTSEC1
Hit any key to stop autoboot:  0
UEC: PHY is Generic MII (70431)
UEC3: Full Duplex
switching to rgmii 100
UEC3: Speed 100BT
UEC3: Link is up
UEC3: Link is down
WARNING: adjusting available memory to 30000000
Wrong Image Format for bootm command
ERROR: can't get kernel image!
=> boot
UEC3: Full Duplex
switching to rgmii 100
UEC3: Speed 100BT
UEC3: Link is up
Using UEC3 device
TFTP from server 10.169.15.10; our IP address is 10.169.15.9
Filename 'uImage'.
Load address: 0x20000000
Loading: T #################################################################
         #################################################################
         ###########################
done
[...]
[----------------------------- snip -----------------------------]

Booting over the TSEC interfaces works without problems. Any idea what might be the problem?

Thanks
Matthias

[U-Boot] UEC phy not working on first try

[Detlev Zundel]

Hi,

> Hi all-
>
> I am using u-boot.2010.09 on a MPC8568-based board.
>
> When trying to boot over one of the UEC network interfaces, it is not
> working instantly. The cable is connected from the beginning, but I
> have to issue a manual 'boot' command, sometimes even multiple times
> before the link is correct. This is the output:

Do all the UEC interfaces show the same symptoms?

>
> [----------------------------- snip -----------------------------]
> Net:   UEC0, UEC1, UEC3 [PRIME], eTSEC0, eTSEC1
> Hit any key to stop autoboot:  0
> UEC: PHY is Generic MII (70431)
> UEC3: Full Duplex
> switching to rgmii 100
> UEC3: Speed 100BT
> UEC3: Link is up
> UEC3: Link is down
^^^^^^^^^^^^^^^^^^^^

The driver "thinks" the link went away again.  When the cable is
connected all the time, then this is an indication of something going
wrong.  You should try to diagnose, why the software gets this link
change and if it really is an information that the phy provides, if the
physical path to the phy is stable.

Best wishes
  Detlev Zundel

-- 
 Those who do not understand Unix are condemned to reinvent it,
 poorly.
 - Henry Spencer, University of Toronto Unix hack
--
DENX Software Engineering GmbH,      MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich,  Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-40 Fax: (+49)-8142-66989-80 Email: dzu at denx.de

[U-Boot] UEC phy not working on first try

[DUNDA Matthias]

> > I am using u-boot.2010.09 on a MPC8568-based board.
> >
> > When trying to boot over one of the UEC network interfaces, it is not
> > working instantly. The cable is connected from the beginning, but I
> > have to issue a manual 'boot' command, sometimes even multiple times
> > before the link is correct. This is the output:
>
> Do all the UEC interfaces show the same symptoms?

Yes, this happens for all UECs. And I think it worked until we switched from u-boot 2009.11.1 to 2010.09 - but there's so much change that I didn't find the reason for it, yet.


> The driver "thinks" the link went away again.  When the cable is
> connected all the time, then this is an indication of something going
> wrong.  You should try to diagnose, why the software gets this link
> change and if it really is an information that the phy provides, if the
> physical path to the phy is stable.

Well, the software runs though uec_init (the_first_run is zero) and gets a positive link state in the do-while-loop instantly. Afterwards adjust_link is called - and there it fails. Strange thing - I guess I need to dig a little deeper...

Code hints are very appreciated! ;-)


> Best wishes
>   Detlev Zundel
Thanks!
Matthias

[U-Boot] UEC phy not working on first try

[Detlev Zundel]

Hi Matthias,

>> > I am using u-boot.2010.09 on a MPC8568-based board.
>> >
>> > When trying to boot over one of the UEC network interfaces, it is not
>> > working instantly. The cable is connected from the beginning, but I
>> > have to issue a manual 'boot' command, sometimes even multiple times
>> > before the link is correct. This is the output:
>>
>> Do all the UEC interfaces show the same symptoms?
>
> Yes, this happens for all UECs. And I think it worked until we
> switched from u-boot 2009.11.1 to 2010.09 - but there's so much change
> that I didn't find the reason for it, yet.

Ah!  I didn't realize that you are in the excellent position to have one
good and one bad commit.  Simply use git bisect to find the problematic
commit and show that to us.

Best wishes
  Detlev

-- 
... and I will continue to use a  low-level language to indicate how
machines actually compute.  Readers  who only want to see algorithms
that are already packaged in a plug-in way, using a trendy language,
should buy other people's books.
                                         -- Donald Knuth, Fascicle 1
--
DENX Software Engineering GmbH,      MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich,  Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-40 Fax: (+49)-8142-66989-80 Email: dzu at denx.de

[U-Boot] UEC phy not working on first try

[DUNDA Matthias]

Hi Detlef,

> >> > I am using u-boot.2010.09 on a MPC8568-based board.

> Ah!  I didn't realize that you are in the excellent position to have
> one
> good and one bad commit.  Simply use git bisect to find the problematic
> commit and show that to us.

so far I traced it down to the adjust_link call in uec_init from file uec.c (line 1234 in release 2011.03).

This call wasn't there in release 2009.11.1 and removing that line solves the issue here.

I don't know, why this went in and what the drawbacks are without it. Maybe someone on this list knows... (Sorry, I didn't search for a specific commit in git, yet. I just diffed pertinent files around the qe|uec|net drivers first.)

Happy sunny Easter all! 8-)
Matthias

[U-Boot] UEC phy not working on first try

[Detlev Zundel]

Hi Matthias,

>> >> > I am using u-boot.2010.09 on a MPC8568-based board.
>
>> Ah!  I didn't realize that you are in the excellent position to have
>> one
>> good and one bad commit.  Simply use git bisect to find the problematic
>> commit and show that to us.
>
> so far I traced it down to the adjust_link call in uec_init from file
> uec.c (line 1234 in release 2011.03).
>
> This call wasn't there in release 2009.11.1 and removing that line
> solves the issue here.

git blame shows this commit to be responsible:

commit 582c55a0274f38e6e7e35b95e7ab81d3e912f700
Author: Heiko Schocher <hs@denx.de>
Date:   Wed Jan 20 09:04:28 2010 +0100

    83xx, uec: split enet_interface in two variables
    
    There's no sensible reason to unite speed and interface type into
    one variable.  So split this variable enet_interface into two
    vars: enet_interface_type, which hold the interface type and speed.
    
    Also: add the possibility for switching between 10 and 100 MBit
    interfaces on the fly, when running in FAST_ETH mode.
    
    Signed-off-by: Heiko Schocher <hs@denx.de>
    Signed-off-by: Ben Warren <biggerbadderben@gmail.com>

> I don't know, why this went in and what the drawbacks are without
> it. Maybe someone on this list knows... (Sorry, I didn't search for a
> specific commit in git, yet. I just diffed pertinent files around the
> qe|uec|net drivers first.)

Hm, looking at adjust_link code, it seems that for you someone set
mii_info->link to 0 which gets you into the else clause of this
function.  On a quick grep, I cannot find any place where this happens,
but I guess this is your problem (or at least one of them) ;)

Maybe Heiko can contribute some more insights?

> Happy sunny Easter all! 8-)

Same to you, thanks!
  Detlev

-- 
There is no need to be  rigid in carrying out policies about what changes
to install.  To do a good job of maintaining Emacs doesn't require acting
like government bureaucrats.
                -- Richard Stallman <E1MIx3Y-0005iZ-OH@fencepost.gnu.org>
--
DENX Software Engineering GmbH,      MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich,  Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-40 Fax: (+49)-8142-66989-80 Email: dzu at denx.de

[U-Boot] UEC phy not working on first try

[Charles Krinke]

Hmmm. I'm not seeing a delayed link behaviour at all and I am using the
latest u-boot-2011.03 on an 8323ERDB which has two UEC's.
On Apr 19, 2011 11:07 PM, "DUNDA Matthias" <Matthias.DUNDA@thalesgroup.com>
wrote:
>> > I am using u-boot.2010.09 on a MPC8568-based board.
>> >
>> > When trying to boot over one of the UEC network interfaces, it is not
>> > working instantly. The cable is connected from the beginning, but I
>> > have to issue a manual 'boot' command, sometimes even multiple times
>> > before the link is correct. This is the output:
>>
>> Do all the UEC interfaces show the same symptoms?
>
> Yes, this happens for all UECs. And I think it worked until we switched
from u-boot 2009.11.1 to 2010.09 - but there's so much change that I didn't
find the reason for it, yet.
>
>
>> The driver "thinks" the link went away again. When the cable is
>> connected all the time, then this is an indication of something going
>> wrong. You should try to diagnose, why the software gets this link
>> change and if it really is an information that the phy provides, if the
>> physical path to the phy is stable.
>
> Well, the software runs though uec_init (the_first_run is zero) and gets a
positive link state in the do-while-loop instantly. Afterwards adjust_link
is called - and there it fails. Strange thing - I guess I need to dig a
little deeper...
>
> Code hints are very appreciated! ;-)
>
>
>> Best wishes
>> Detlev Zundel
> Thanks!
> Matthias
>
>
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