u-boot ppc440epx bootstrap configuration without eval board

u-boot ppc440epx bootstrap configuration without eval board

[Dave Cogley]

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Hello,

 

We are using the new AMCC ppc440epx 667MHz chip and I am trying to get
u-boot to recognize the clock rate of the new chip (we were using the
533MHz).  I notice in the cmd_sequoia.c module that there is an option to
setup some sort of strapping in the configuration FPGA that was present on
the evaluation card.  We do not have this configuration FPGA present in our
production board.  Is there some sort of build flag I can specify to
"hardwire" this bootstrap information?  Or at least some I can tell u-boot
to startup with the 667MHz clock rate?  I believe we are using option 7 in
the configuration array for the "bootstrap" command.

 

Thanks,

Dave Cogley

Software Engineer

Ultra Stereo Labs, Inc.

(805) 549-0161

mailto:dcogley@uslinc.com

 


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RE: u-boot ppc440epx bootstrap configuration without eval board

[Dave Cogley]

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Disregard the boot strapping problem.  It appears we are hardwired strapped
to use option "C" however my CPU is not being recognized as a 667MHz.  Which
option should I be using for the 667MHz processor?

 

 

  _____  

From: Dave Cogley [mailto:dcogley@uslinc.com] 
Sent: Wednesday, April 02, 2008 10:15 AM
To: 'linuxppc-embedded@ozlabs.org'
Subject: u-boot ppc440epx bootstrap configuration without eval board

 

Hello,

 

We are using the new AMCC ppc440epx 667MHz chip and I am trying to get
u-boot to recognize the clock rate of the new chip (we were using the
533MHz).  I notice in the cmd_sequoia.c module that there is an option to
setup some sort of strapping in the configuration FPGA that was present on
the evaluation card.  We do not have this configuration FPGA present in our
production board.  Is there some sort of build flag I can specify to
"hardwire" this bootstrap information?  Or at least some I can tell u-boot
to startup with the 667MHz clock rate?  I believe we are using option 7 in
the configuration array for the "bootstrap" command.

 

Thanks,

Dave Cogley

Software Engineer

Ultra Stereo Labs, Inc.

(805) 549-0161

mailto:dcogley@uslinc.com

 


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Re: u-boot ppc440epx bootstrap configuration without eval board

[Stefan Roese]

On Wednesday 02 April 2008, Dave Cogley wrote:
> Disregard the boot strapping problem.  It appears we are hardwired strapped
> to use option "C" however my CPU is not being recognized as a 667MHz. 
> Which option should I be using for the 667MHz processor?

First, this is the wrong mailing list for this discussion. Please post to the 
U-Boot list instead.

But here some general comments:

The bootstrap controller has multiple configuration options. Some of them 
result in hardwired frequencies (CPU, PLB, OPB...), and some of them load the 
PLL setup from an I2C EEPROM. Using this bootstrap EEPROM is the most 
flexible solution. If you have only option "C", then you hardwired to 533MHz. 
There is no way to "detect" which frequency this CPU is labeled.

But it *is* possible to reconfigure the PLL from within U-Boot an reset the 
PPC to run with this different PLL setup. I just recently added some code the 
u-boot-ppc4xx custodian repository.

Let's continue this thread on the U-Boot list.

Best regards,
Stefan

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Phone: +49-8142-66989-0 Fax: +49-8142-66989-80  Email: office@denx.de
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Re: u-boot ppc440epx bootstrap configuration without eval board

[Wolfgang Denk]

In message <000901c894eb$e0707170$2001a8c0@DCOGLEYNEW> you wrote:
> 
> Disregard the boot strapping problem.  It appears we are hardwired strapped
> to use option "C" however my CPU is not being recognized as a 667MHz.  Which
> option should I be using for the 667MHz processor?

U-Boot related questions are off  topic  here.  You  should  try  the
u-boot-users mailing list instead...

Best regards,

Wolfgang Denk

-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de
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