[oe] hawkboard at 456 Mhz?

Koen Kooi k.kooi at student.utwente.nl
Mon Mar 22 08:35:11 UTC 2010

Hash: SHA1

On 21-03-10 20:38, Frans Meulenbroeks wrote:
> 2010/3/21 Koen Kooi <k.kooi at student.utwente.nl>:
>> Hash: SHA1
>> On 21-03-10 13:57, Frans Meulenbroeks wrote:
>>> Hi,
>>> In the openembedded repository I saw the following patch:
>>> http://cgit.openembedded.org/cgit.cgi/openembedded/tree/recipes/linux/linux-davinci/da850_omapl138_opp456mhz.patch
>>> This seems to suggest that it is possible to run the hawkboard at 456
>>> Mhz (and yeah: I know it is out of spec and out of warranty, but for
>>> an experiment it would be quite helpful for me).
>>> I've build the kernel with openembedded, the patch is applied,
>>> CONF_CPU_FREQ is defined, but the control hook in /sys is not there.
>>> I've also tried tweaking the file with the settings (ds850.c) but to no avail.
>>> Anyone a suggestion on how to get this done?
>> You need a newer kernel that doesn't rely on the TPS part for cpufreq
>> (hawkboard lacks a PMIC, the evm uses the TPS). You can build from the
>> ti/staging[1] branch to get such a kernel.
>> Or wait a week for that branch to get merge, internal testing is finally
>> wrapping up.
>> [1] http://gitorious.org/angstrom/openembedded/commits/ti/staging
> Koen,
> Thanks alot!
> As patience is something that I don't have an overdose of, I decided
> not to waste any on this issue.
> So I checked out the git and rebuild the kernel. Works like a charm.
> For those who want to reproduce this:
> Be sure to adapt defconfig (CONFIG_DA8XX_MAX_SPEED_456=y)
> I changed the speed setting with cpuspeed, this one is not on the
> angstrom feed, so you need to build it yourself too.

I use cpufrequtils, is cpuspeed a better option?
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