2008-07-29 08:27:47 VCO_MULTI out of range
Miquel Soler i Mir (SPAIN)
Message: 59543
Hello.
I'm configurin the Clock setting for CORE_CLOCK and SCLK.
In my test I'm configurion the core clock at 325 MHz and SCLK to 130 MHz.
The range of VCO_MULTI is between 1 and 64.
The range of Core Clock Fivider is 1,2,4 or 8.
The range of System Clock Divide is between 1 and 15.
I'm using this setting
(26) VCO Multiplier
Core Clock Divider (2) --->
(5) System Clock Divider
making the kernel the systema answer me this:
arch/blackfin/mach-common/arch_checks.c:36:4: error: #error "VCO selected is more than maximum value. Please change the VCO multipler"
I don't know the reason of this error, all the paremeters are in range.
Can somebody help me ?
Miquel Soler i Mir
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2008-07-29 08:50:14 Re: VCO_MULTI out of range
Michael Hennerich (GERMANY)
Message: 59545
Your VCO may not exceed the speed grade of your device.
Which is typically 500 or 600MHz.
26 * 25MHz = 650 MHz
-Michael
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2008-07-29 09:04:07 Re: VCO_MULTI out of range
Mike Frysinger (UNITED STATES)
Message: 59546
if you want the exact range, read the datasheet for your part
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2008-07-30 09:12:53 Re: VCO_MULTI out of range
Miquel Soler i Mir (SPAIN)
Message: 59608
OK. Thanks
I read the datasheet and I have a question:
The max freq for example ADSP-BF537BBCZ-5A is 500 MHz. But this max freq of VCO or Core_clock?
Thanks.
Miquel Soler i Mir
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2008-07-30 10:15:46 Re: VCO_MULTI out of range
Michael Hennerich (GERMANY)
Message: 59609
The ADSP-BF537 datasheet gives you the details:
Phase-Locked Loop Operating Conditions:
Parameter Minimum Maximum Unit
fVCO Voltage Controlled Oscillator (VCO) Frequency: 50 to Speed Grade MHz
Speed Grade is Core CLK ...
-Michael
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2008-07-30 11:54:46 Re: VCO_MULTI out of range
Wei Jiang (CHINA)
Message: 59613
Miquel,
look at this words in arch/blackfin/Kconfig:
config MAX_VCO_HZ
int
default 600000000 if BF522
default 400000000 if BF523
default 400000000 if BF524
default 600000000 if BF525
default 400000000 if BF526
default 600000000 if BF527
default 400000000 if BF531
default 400000000 if BF532
default 750000000 if BF533
default 500000000 if BF534
default 400000000 if BF536
default 600000000 if BF537
default 533333333 if BF538
default 533333333 if BF539
default 600000000 if BF542
default 533333333 if BF544
default 600000000 if BF547
default 600000000 if BF548
default 533333333 if BF549
default 600000000 if BF561