[U-Boot] [PATCH] ppc4xx: AMCC PPC460GT/EX PCI-E de-emphasis adjustment fix

[Tirumala Reddy Marri]

Hi Stefan,
  There were silent corruptions I noticed during a RAID-5 test using
silicon image card. Then I hooked up a analyzer and found that eye
diagram was not wide enough. After  reducing the de-emphasis value I
noticed better eye diagram. Also I ran 72 hour test which was successful
to see if there are any corruptions .

   Even though these de-emphasis values are only applicable to Linux. I
wanted to make sure both Linux and u-boot are in sync.
Regards,
Marri
-----Original Message-----
From: Stefan Roese [mailto:sr at denx.de] 
Sent: Friday, August 22, 2008 1:42 AM
To: u-boot at lists.denx.de
Cc: Feng Kan; Tirumala Reddy Marri
Subject: Re: [U-Boot] [PATCH] ppc4xx: AMCC PPC460GT/EX PCI-E de-emphasis
adjustment fix

Hi Marri,

On Friday 22 August 2008, fkan at amcc.com wrote:
> From: Tirumala R Marri <tmarri at amcc.com>
>
> During recent PCI-E tests it has been found that current driverl level

> and de-emphasis values are not set correctly.
> After sweeping throgh all de-ephasis values, it was found that 0x130 
> is a right value. Where 0x13 is driver level and 0 is de-emphasis.

Is this supposed to fix the issue with the Intel PRO/1000 in PCIe slot 0
on Canyonlands? Booting with root-fs via NFS doesn't work with this card
in slot 0. In slot 1 it works.

I just tested this patch and the Linux patch you posted and the issue is
still
there:


eth0: Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX
Looking up port of RPC 100005/1 on 10.0.0.152
VFS: Mounted root (nfs filesystem).
Freeing unused kernel memory: 156k init
modprobe: FATAL: Could not load
/lib/modules/2.6.26-00016-gf873d41/modules.dep: No 
such file or directory

modprobe: FATAL: Could not load
/lib/modules/2.6.26-00016-gf873d41/modules.dep: No 
such file or directory

INIT: version 2.86 booting
                Welcome to DENX Embedded Linux Environment
                Press 'I' to enter interactive startup.
modprobe: FATAL: Could not load
/lib/modules/2.6.26-00016-gf873d41/modules.dep: No 
such file or directory

modprobe: FATAL: Could not load
/lib/modules/2.6.26-00016-gf873d41/modules.dep: No 
such file or directory

Cannot access the Hardware Clock via any known method.
Use the --debug option to see the details of our search for an access
method.
Setting clock : Thu Jan  1 01:00:13 CET 1970 [  OK  ]
Building the cache nfs: server 10.0.0.152 not responding, still trying
nfs: server 10.0.0.152 not responding, still trying
nfs: server 10.0.0.152 not responding, still trying
nfs: server 10.0.0.152 not responding, still trying
nfs: server 10.0.0.152 not responding, still trying


Any comments on this?

Thanks.

Best regards,
Stefan

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