[U-Boot] Low BogoMIPS on MPC8541

[U-Boot] Low BogoMIPS on MPC8541

[Luigi 'Comio' Mantellini]

Hi All,

I'm working on a stripped-down mpc8541 board (that has just 
a serian and twe enets).
I have an issue on delay calibration. In fact at boot time, I see the 
following linux printk message on the serial console:

....
Calibrating delay loop... 83.20 BogoMIPS (lpj=166400)
....

This value seems to be too low and I suspect an error propagated from u-boot.

Can anyone help me to understand a good way to investigate this problem? which 
registers or configuration values I need to check?

I will post the necessary snips of code or configuration if required.

Thanks a lot for your help,

ciao

luigi


-- 
Luigi 'Comio' Mantellini

R&D - Software
Industrie Dial Face S.p.A.
Via Canzo, 4
20068 Peschiera Borromeo (MI), Italy
Tel.:  +39 02 5167 2813
Fax:   +39 02 5167 2459
Email: luigi.mantellini at idf-hit.com

[U-Boot] Low BogoMIPS on MPC8541

[Kumar Gala]

On Oct 27, 2009, at 10:29 AM, Luigi 'Comio' Mantellini wrote:

> Hi All,
>
> I'm working on a stripped-down mpc8541 board (that has just
> a serian and twe enets).
> I have an issue on delay calibration. In fact at boot time, I see the
> following linux printk message on the serial console:
>
> ....
> Calibrating delay loop... 83.20 BogoMIPS (lpj=166400)
> ....

The value seems reasonable.  What freq is the core running at  
(guessing 833Mhz).  My 1.5Ghz 8572 has a bogomips of 150.

- k

[U-Boot] Low BogoMIPS on MPC8541

[Jens Gehrlein]

Hi Kumar,

Kumar Gala schrieb:
> On Oct 27, 2009, at 10:29 AM, Luigi 'Comio' Mantellini wrote:
> 
>> Hi All,
>>
>> I'm working on a stripped-down mpc8541 board (that has just
>> a serian and twe enets).
>> I have an issue on delay calibration. In fact at boot time, I see the
>> following linux printk message on the serial console:
>>
>> ....
>> Calibrating delay loop... 83.20 BogoMIPS (lpj=166400)
>> ....
> 
> The value seems reasonable.  What freq is the core running at  
> (guessing 833Mhz).  My 1.5Ghz 8572 has a bogomips of 150.

Seems that the value is about a tenth of the core frequency.
I observed similar on TQM8548. Although I know, that the value
is bogus (as the name tells), do you know the reason, why it
isn't the core frequency?

Thanks.

Kind regards,
Jens

[U-Boot] Low BogoMIPS on MPC8541

[Wolfgang Denk]

Dear Jens Gehrlein,

In message <4AE94201.8000302@tqs.de> you wrote:
> 
> Seems that the value is about a tenth of the core frequency.
> I observed similar on TQM8548. Although I know, that the value
> is bogus (as the name tells), do you know the reason, why it
> isn't the core frequency?

Please read the FAQ:

http://www.denx.de/wiki/view/DULG/BogoMIPSValueTooLow

(especially entry 2)

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 at denx.de
      Bugs are by far the largest and  most successful class of
      entity, with nearly a million known species. In this res-
      pect they outnumber all the other  known  creatures about
      four to one.  -- Professor Snope's Encyclopedia of Animal

[U-Boot] Low BogoMIPS on MPC8541

[Luigi Mantellini]

Thanks for the information... this means less work form me... at least
for this day.

ciao

luigi

On Thu, Oct 29, 2009 at 11:36 AM, Wolfgang Denk <wd@denx.de> wrote:
> Dear Jens Gehrlein,
>
> In message <4AE94201.8000302@tqs.de> you wrote:
>>
>> Seems that the value is about a tenth of the core frequency.
>> I observed similar on TQM8548. Although I know, that the value
>> is bogus (as the name tells), do you know the reason, why it
>> isn't the core frequency?
>
> Please read the FAQ:
>
> http://www.denx.de/wiki/view/DULG/BogoMIPSValueTooLow
>
> (especially entry 2)
>
> 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 at denx.de
> ? ? ?Bugs are by far the largest and ?most successful class of
> ? ? ?entity, with nearly a million known species. In this res-
> ? ? ?pect they outnumber all the other ?known ?creatures about
> ? ? ?four to one. ?-- Professor Snope's Encyclopedia of Animal
> _______________________________________________
> U-Boot mailing list
> U-Boot at lists.denx.de
> http://lists.denx.de/mailman/listinfo/u-boot
>



-- 
Luigi 'Comio' Mantellini
R&D - Software
Industrie Dial Face S.p.A.
Via Canzo, 4
20068 Peschiera Borromeo (MI), Italy

Tel.: +39 02 5167 2813
Fax: +39 02 5167 2459
web: www.idf-hit.com
mail: luigi.mantellini at idf-hit.com