2009-08-11 21:08:39     Error: VCO selected is more than maximum value

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2009-08-11 21:08:39     Error: VCO selected is more than maximum value

Frank Van Hooft (CANADA)

Message: 78686   

 

We're starting work on our new BF523 board with the 2009R1 branch. In menuconfig:

 

Blackfin Processor Options -> Processor and Board Settings -> Board Customizations -> VCO Multiplier

 

we set a VCO setting of 32. When we 'make', we get this error:

 

arch/blackfin/mach-common/arch_checks.c:37:4: error: #error "VCO selected is more than maximum value. Please change the VCO multipler"

 

Setting the VCO multiplier setting to a much lower value, like 16, this error does not appear.

 

According to the BF523 datasheet, the PLL can be set from x1 to x64.

 

I've attached the linux-2.6.x/.config file in case anyone wants it.

 

Any ideas on how to get past this?

 

Many thanks!

 

config_fail

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2009-08-11 21:18:47     Re: Error: VCO selected is more than maximum value

Mike Frysinger (UNITED STATES)

Message: 78687   

 

the BF523 has a max freq of 400mhz.  your config is telling the system to use a CCLK of 512mhz (clkin=16mhz * vco_mult=32 / cclk_div=1).  the kernel config does not allow for overclocking.

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2009-08-11 21:33:12     Re: Error: VCO selected is more than maximum value

Frank Van Hooft (CANADA)

Message: 78688   

 

Now that's interesting. Where did you find that 400 MHz max number? According to the ADI BF523 page:

 

www.analog.com/zh/embedded-processing-dsp/blackfin/adsp-bf523/processors/product.html

 

the 523 comes in two flavours; a 533 MHz and a 600 MHz.

 

(As an aside, when you view that page, do you see a bunch of Chinese characters? I do, both in WinXP and Linux; not sure why.)

 

We're using the 533 MHz flavour.

 

Thanks Mike.

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2009-08-11 22:26:37     Re: Error: VCO selected is more than maximum value

Mike Frysinger (UNITED STATES)

Message: 78690   

 

i think in the preliminary datasheets and renumbering that happened with BF52x, the variants were lost in the shuffle.  ive updated the BF522/BF523 speeds to reflect latest datasheet.

 

the url you used is the chinese translation (notice the /zh/ in the url base), so you probably want to change that to /en/.

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2009-08-11 23:00:21     Re: Error: VCO selected is more than maximum value

Frank Van Hooft (CANADA)

Message: 78692   

 

Thanks Mike. I'll do an 'svn up' from the 2009 branch and try again.

 

Regarding the webpage, thanks for the tip. Turns out that the blackfin english product selection table on the ADI website links to those chinese translation pages. You can see it here:

 

www.analog.com/en/embedded-processing-dsp/blackfin/processors/selection-tables/Blackfin_Selection_Table/resources/fca.html

 

I sent a message to the webmaster so hopefully they can fix that.

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2009-08-11 23:15:22     Re: Error: VCO selected is more than maximum value

Mike Frysinger (UNITED STATES)

Message: 78693   

 

i see /en/ for all my links.  perhaps it's based on the headers your browser is sending or the site tries to use geo location and your ip indicates it's in china.

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2009-08-11 23:25:38     Re: Error: VCO selected is more than maximum value

Frank Van Hooft (CANADA)

Message: 78694   

 

Hmm, that's very interesting. I'm seeing it in two different browsers in two different OS's (WinXP & Linux). So it's probably not the browser. Your geo idea is a possibility - I know I have a canadian IP, so maybe the site is confusing canada & china. Well, I guess I'll find out if the adi webmaster query I sent even gets a response first.

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2009-08-11 23:26:34     Re: Error: VCO selected is more than maximum value

Frank Van Hooft (CANADA)

Message: 78695   

 

And by the way, your fix worked - thanks.

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