[U-Boot] TSEC ethernet controller problems (crc errors/ corruption)

[Ira Snyder <iws@ovro.caltech.edu>]

On Wed, Jun 03, 2009 at 03:19:05PM -0500, Kim Phillips wrote:
> On Wed, 3 Jun 2009 10:50:25 -0700
> Ira Snyder <iws@ovro.caltech.edu> wrote:
> 
> > On Tue, Jun 02, 2009 at 06:08:17PM -0500, Kim Phillips wrote:
> > > On Tue, 2 Jun 2009 15:19:18 -0700
> > > Ira Snyder <iws@ovro.caltech.edu> wrote:
> > > 
> > > > On Tue, Jun 02, 2009 at 02:25:03PM -0700, Ira Snyder wrote:
> > > > > > 
> > > > > > And what is the SICRH[30-31]?
> > > > > > Did you have the matching settings for GMII with 3.3V?
> > > > > > 
> > > > > 
> > > > > => md e0000118 1
> > > > > e0000118: 00000002    ....
> > > > > 
> > > > > This looks wrong. The MPC8349EMDS board has the exact same setting in
> > > > > that register. Writing 0x0 to the SICRH register did not cause the
> > > > > problem to go away.
> 
> ok this...
> 
> > > > > 
> > > > 
> > > > The MPC8349EMDS config has had that setting since it was imported into
> > > > U-Boot. I've copied the relevant part of include/configs/MPC8349EMDS.h
> > > > below.
> > > > 
> > > > #define CONFIG_SYS_SICRH SICRH_TSOBI1
> > > > 
> > > > This seems wrong for the MPC8349EMDS board. I tried setting the register
> > > > value to 0x0 by hand on my MPC8349EMDS eval board, and the network still
> > > > works as expected.
> > > 
> > > still works or does not work?  100mbit or 1000mbit??
> > > 
> > 
> > Network works, both 100 and 1000 mbit.
> 
> and this seeming contradiction lead to my source of confusion.
> 
> What I think is going on is that you're setting SICRH to 0 on your
> custom board and it still has its network problems, and setting it to 0
> on the original MPC8349E-MDS board makes no difference - networking
> works with it set to both 0 and 2.  ok.
> 

Yes, that is exactly correct. Sorry for my poor choice of words earlier.

> > > > Is this a bug in the MPC8349EMDS config?
> > > 
> > > It might be.  Another thing that changed wrt that area was commit
> > > 846f1574.  Assuming this is all still clear to me, perhaps what that
> > > patch does should be made 8349-revision dependent?
> > > 
> > 
> > My MPC8349EMDS reference manual says that bits 28-29 should be
> > preserved, which is exactly what the commit message states.
> > 
> > I don't see a problem with commit 846f1574 at all. The bug is that SICRH
> > is set to SICRH_TSOBI1 (0x2), which changes the TSEC1 output buffer
> > parameters to RGMII/RTBI mode.
> 
> yeah my bad, I miscalculated which bits that commit was masking.
> 
> > The MPC8349EMDS's PHY's are both in GMII mode, the do not use RGMII/RTBI
> > or any of the other reduced pin count interfaces. Therefore, I think the
> > bit should be cleared, and SICRH should be set to 0x0.
> 
> technically BCSR5 holds the reduced mode MII setting (set via SW4).  The
> default is GMII, but, as in the case of the 8360 MDS, networking didn't
> work out of the box with the default switch settings.
> 
> > Even if I'm wrong, then the bits for both TSEC1 and TSEC2 should be the
> > same.  Right now, TSEC1 has the RGMII/RTBI output parameters, and TSEC2
> > has the GMII output parameters.
> > 
> > In practice, this doesn't seem to make a difference on the MPC8349EMDS
> > eval board. Both settings work without any errors. For people like me,
> > who are copying an existing board port to a similar board, it would be
> > nice if it was correct.
> 
> granted.  I'm betting the sbc8349 and tqm834x just copied the setting
> from the MDS code, so those should get 0 too.  Board maintainers,
> please test:
> 
> diff --git a/include/configs/MPC8349EMDS.h b/include/configs/MPC8349EMDS.h
> index 3c57403..2d2799e 100644
> --- a/include/configs/MPC8349EMDS.h
> +++ b/include/configs/MPC8349EMDS.h
> @@ -598,7 +598,7 @@
>  #define CONFIG_SYS_SCCR_TSEC2CM        1       /* TSEC2 & I2C0 clock mode (0-3)
>  
>  /* System IO Config */
> -#define CONFIG_SYS_SICRH SICRH_TSOBI1
> +#define CONFIG_SYS_SICRH 0
>  #define CONFIG_SYS_SICRL SICRL_LDP_A
>  
>  #define CONFIG_SYS_HID0_INIT   0x000000000

I can ACK this board. I've run the following combinations on my
MPC8349EMDS eval board. All of the configurations worked perfectly.

U-Boot, PCI Host mode,  1000 mbit
U-Boot, PCI Host mode,  100  mbit
U-Boot, PCI Agent mode, 1000 mbit
U-Boot, PCI Agent mode, 100  mbit
Linux,  PCI Host mode,  1000 mbit
Linux,  PCI Host mode,  100  mbit

Thanks for looking at this!
Ira