Howto: Dynamic CPU speed with Athlon XP and nForce2 boards

Jinidog · Guru Joined: 26 Nov 2003 Posts: 593 Location: Berlin

My nforce2-board (N2U400) can bring the clock down, but not bring it up again.
It freezes when I try so.
Has someone a hint?
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Jase · Posted: Thu Sep 29, 2005 6:26 pm Post subject:

Cpufreq seems to work nicely or atleast I think so. When I set my fsb to minimum the CPU MHz in /proc/cpuinfo doesn't update, but the bogomips drop 4400 to 3300. So I think it works.

On the other hand atxp1 doesn't work at all. I get kernel oops when trying to change the voltage. Dmesg shows this when I load the atxp1 modules "atxp1 2-004e: Using VRM: 9.0" There's no " .... atxp1: Detected on SMBus nForce2 adapter at 5000, address 0x37" like in the first post of this thread.

I use 2.6.13.2-nitro1 kernel and atxp1-0.6.

Here's the oops

Hasw · n00b Joined: 31 Dec 2004 Posts: 68 Location: Germany

@Jinidog: What's your Boot-FSB and your lowest value?

@Jase: cpufreq should update /proc/cpuinfo...hm. The "Detected on..." message was removed. Also they changed somewhere between 2.6.11 and 2.6.12-13 the sysfs-interface ("warning: initialization from incompatible pointer type"...not good), so it will crash if someone tries to write to the device...
Have you checked if the ATXP1 module is maybe already in your kernel?

Jinidog · Guru Joined: 26 Nov 2003 Posts: 593 Location: Berlin

I have a AthlonXP 2800+.
Normally it runs with 2070 MHz and I can scale it down to 1512500 Hz.
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Jase · Posted: Thu Sep 29, 2005 8:10 pm Post subject:

stealth_br · n00b Joined: 28 Sep 2005 Posts: 3

Any tool to change vcore on asus motherboard ?
atxp1 doesn't work.

stealth_br · n00b Joined: 28 Sep 2005 Posts: 3

I forgot to ask.
does anyone have 8rdavcore for linux. They released a 0.5.5 version , but after GPL problems it has disappeared and i can find nowhere.

Hasw · n00b Joined: 31 Dec 2004 Posts: 68 Location: Germany

8rdavcore 0.5.5 was a userspace ATXP1 driver. Since there's now a ATXP1 module for the kernel the old cold isn't required any more. Maybe when I get the time I'll finish the successor of 8rdavcore, which will run on linux.

alphonsebrown · n00b Joined: 17 Nov 2005 Posts: 4

I have some problem with the kernel patches

# pwd
/usr/src/kernels/2.6.14-1.1637_FC4-i686

# patch -Np1 < atxp1-0.6.patch
patching file drivers/i2c/chips/Kconfig
Hunk #1 succeeded at 74 (offset -319 lines).
patching file drivers/i2c/chips/Makefile
Hunk #1 FAILED at 11.
1 out of 1 hunk FAILED -- saving rejects to file drivers/i2c/chips/Makefile.rej
patching file drivers/i2c/chips/atxp1.c

# patch -Np1 < i2c-vid-vrm90.patch
can't find file to patch at input line 3
Perhaps you used the wrong -p or --strip option?
The text leading up to this was:
--------------------------
|--- linux-2.6.11-rc4-mm1-orig/include/linux/i2c-vid.h 2005-02-26 16:12:23.710354080 +0100
|+++ linux-2.6.11-rc4-mm1/include/linux/i2c-vid.h 2005-02-26 16:13:27.690627600 +0100
--------------------------
File to patch:
Skip this patch? [y]
Skipping patch.
1 out of 1 hunk ignored

please any suggestions are welcome
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PrakashP · 2.6.14 doesn't need patching.

2.6.14 doesn't need patching.

alphonsebrown · n00b Joined: 17 Nov 2005 Posts: 4

alphonsebrown · n00b Joined: 17 Nov 2005 Posts: 4

zensoni · n00b Joined: 24 Nov 2005 Posts: 1

Hi there

I have been playing around with cpufreq-nforce2. It has great potential, but I am not satisfied yet :-)

On my ASUS A7N8X-X, I can bring my Barton 2800+ (2083 = 12.5 * 166) down to 625Mhz. But I can not bring it up again. When I cross around 1000MHz on the way down I cannot go up again.

Scenario: From 2083 -> 1500Mhz -> 1200Mhz -> 800Mhz -> 625Mhz -> 700 -> 800 -> 900 -> 1000 -> 1100 -> 1200 -> 1300 -> 1400 -> boom (1500)
Scenario: 2083 -> 1600 -> 1200 -> 1600 -> 2083 totally stable
Scenario: 2083 -> 1600 -> 1200 -> 1000 -> 1200 (boom)

I then tried another board. Aopen AK79D-400VN. There I can do whatever I desire, but the MHz does not go down in /proc/cpuinfo ALTHOUGH the bogomips does!!! The bogomips value gets updated, but the system remains at 2083. I then tried another CPU. Same deal. I don't get it. AK79D-400VN is listed as supported. I can see that other ppl in this thread have had simelar problems.

Any clues? Ideas? solutions? Ohh yes, stock voltage, no overclocking, no out of bounds on ram and so forth, and the latest 2.6.14.2 kernel.

Regards Thomas, Denmark

woZa · Posted: Mon Nov 28, 2005 4:39 pm Post subject:

soql · n00b Joined: 10 Dec 2005 Posts: 5

Hello !! Sorry for my very poor english.
Could you tell me which version of bios you use in yours 8rda+, because on my computer (gentoo,8rda+) cpufreq works but I can change FSB only with 20Mhz. If I have default FSB on 200 and I change to 180 everything ok, but

cpufreq-set -s 1700000

makes my gentoo halt immidietly :-(

I use 2.6.14.3

anilan · n00b Joined: 22 Feb 2006 Posts: 1

Hallo,
I'm using an Epox 8RDA6+ Pro with Mobile-Barton 2500+ and changing FSB and voltage is possible and work fine, but I can't go below 1.325V. When I set Vcore to 1.300V the system hangs. I think 1.100V must be possible. What is wrong or has anybody an idea?

Thanks!

woZa · Posted: Fri Mar 03, 2006 5:42 pm Post subject:

Hmmm, autocpufreq scripts lowers voltage and cpu frequency when run but never raises either again. It is as if it doesn't realise that the cpu is at 100% load... Anyone else experience this? Doing things manually seems to work ok now...
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luisfeser · Posted: Wed Apr 05, 2006 12:17 pm Post subject:

Anybody can change vcore in an Abit an7 mobo?
I can change the fsb, but not the vcore, so the temperature don't down

I think this is about uguru chip, that i can't see voltages or temperatures of my mobo.
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luisfeser · Posted: Wed Apr 05, 2006 7:09 pm Post subject:

this is the error:
i can see the vcore:

parism_s · n00b Joined: 09 Jun 2006 Posts: 1

Hi, is there any way to manually change the maximum_fsb frequency so that it is above the boot_fsb? The only option I see is the min_fsb=..
I have got a shuttle an35n ultra and I want to scale from 66Mhz to 200Mhz Fsb. However if I boot at 200Mhz it only goes down to 150Mhz. If I boot at 133 Mhz I am limited to an 133Mhz maximum but can scale down to 66Mhz. Using 8rdvcore in windows only booting at 133Mhz I can scale from 66 to 200 and back without any problems. Any recommendations? Unforunately I know nothing about programming so I don't have the knowledge to modify the cpufreq-nforce2 source.

fysa · n00b Joined: 16 Aug 2006 Posts: 1

brucer · n00b Joined: 18 Sep 2006 Posts: 1

I can setup the most modules and use the cpufreq-nforce2 for changing my CPU-Speed.
If i load the modules for atxp1 it says:

cpufreq: Detected nForce2 chipset revision C1
cpufreq: FSB changing is maybe unstable and can lead to crashes and data loss.
cpufreq: FSB currently at 100 MHz, FID 10.0
i2c_adapter i2c-1: nForce2 SMBus adapter at 0x5000
i2c_adapter i2c-2: nForce2 SMBus adapter at 0x5040

in your Howto it should be like that with dmesg:
atxp1: Detected on SMBus nForce2 adapter at 5000, address 0x37

after loading the modules I can see in the location /sys/bus/i2c/devices/9191-0290
all neccesary files and read out the /in1_input, but even with setting the file-rights correct
it is not possible to change the volt.

in my bios i set the core volt at 1.6
on my motherboard is a chip its named attansic so i expected this to work
my linux is gentoo, kernel 2.6.16

may be anyone of yours find some mistakes here
thanks

kondzik · n00b Joined: 24 Jun 2006 Posts: 16 Location: Cracow/Poland