Lost overclocking after updates

[ferrymanr]

Hi
I have for some time had my /boot/config.txt altered to increase clocks and this has worked very well:
arm_freq=900
gpu_freq=250
sdram_freq=500
This morning I ran rpi-update followed by apt-get update and apt-get upgrade. Now the system seems to be back at 700MHz. There seem to be a a number of linesduring boot that seem to rlate to frequencies but I don't understand them.
Is there a change to the way the overclocking should be set up?
Thanks

[RaTTuS]

I've not done an update for a few days however
can you share your updated file [or the relevant bits]
could it be just a currupted config file?

[Licaon_Kter]

It happened to me once, did not track it, somehow the config.txt got overwritten.

[dom]

Hi
I have for some time had my /boot/config.txt altered to increase clocks and this has worked very well:
arm_freq=900
gpu_freq=250
sdram_freq=500
This morning I ran rpi-update followed by apt-get update and apt-get upgrade. Now the system seems to be back at 700MHz. There seem to be a a number of linesduring boot that seem to rlate to frequencies but I don't understand them.
Is there a change to the way the overclocking should be set up?
Thanks

Check here:
http://www.raspberrypi.org/phpBB3/viewt ... ng#p169726

[Sander]

It happened to me once, did not track it, somehow the config.txt got overwritten.

Overwritten config.txt? I have had strange experiences with config.txt too: after changing it, there were a lot of strange characters in config.txt from the point where I had edited it.

So, easy check: what does "cat /boot/config.txt" look like? Normal, or strange characters / format somewhere?

My work around: shutdown Raspi, put the SD card into another computer, mount it, edit the config.txt file, save it, unmount, and put the SD card back into the Raspi.

HTH

[ferrymanr]

Thanks Dom, that explains it all. I run a lot of analysis using FFT which hits the cpu hard. When I first tried overclocking to 900MHz I could not measure any temperature change but fitted heatsinks to both the chips 'just in case'. The supply current only increased by one or two milliamps so I never thought dynamic clocking would be necessary. Perhaps it would be more of a problem with higher overclocking rates. I shall see how it runs over the next few days with the new system.
Richard (Dick) G4BBH

[Licaon_Kter]

why not edit it on the Pi itself?
It might get CR/LF "^M" artefacts due to editing it on Windows, if so do use Notepad++