4 sharp rom kernels to choose from

[Anonymous]

Hi,
I see from download page , there are 4 different sharp rom kernels for sl-5600.
We have two preemptive standard kernels (version 1.1 dated 1/4), version 1.2 (dated 1/18) .

 Then 2 special kernels (version 1.0) dated 1/6, and version 1.1 dated 1/18 (all about same size).

From reading descriptions, the only thing different I see is that the \"special kernel\" may have wireless extensions turned on but that this was not tested.

Is this the only real difference between special and preemptive)?
What was added in later versions?
So I guess if you want to run wellenreiter you want special kernel 1.1?

Is that correct

Thanks
Greg

[Tehas]

There are two main possibilities.  Preemptive and preemptive with overclocking.  Each of these has had a patch uploaded to correct some wireless stuff.  So, go for the most recent of either one depending upon wheter you want to try the overclocking boost.

[rgbman]

There are two main possibilities.  Preemptive and preemptive with overclocking.  Each of these has had a patch uploaded to correct some wireless stuff.  So, go for the most recent of either one depending upon wheter you want to try the overclocking boost.

I believe the first two are just two versions of the pre-emptive standard, meaning no overclocking, and the second two are versions of the special, which includes the anti-patch-patch, and overclocking.  

I\'ve tried both the pre-emptive (v1.2) and the special (v1.1.), but can\'t tell the difference.  I mean they both are faster than the defaul kernel (or non pre-emptive), but clock speed remains the same in /proc/cpuinfo from pre-emptive standard and the special.  Am I missing something or is that expected?

File sizes _are_ slightly different between the two.

[tumnus]

The ZUG downloads doesn\'t seem to let you override or delete a previous version, so when I added Wireless Extensions to just the plain pre-emptive kernel and the \'Special\' (overclocked) kernel I could only add them to the downloads.

The plain pre-emptive kernel is simply the standard 5600 kernel source with the pre-emptive patch and PXA250 bug workaround turned off (which is what really gives the speed boost)

The \'Special\' kernel is actually the C860 kernel source configured for the 5600 with various patches applied, including the pre-emptive patch and a patch to give access to the CCCR register which is what controls the XScale CPU speed. Also the PXA250 bug workaround is turned off in this kernel too, which again is what gives the main speed boost.

To benchmark your 5600 with different kernels, use something like this: http://laurent.lieben.free.fr/zaurus_kernel/dhry21
(It\'s only a binary so you have to copy it to somewhere in the Path on your Z and make sure it is executable)

With the \'Special\' kernel you can control the clock speed using this application:
http://www.piro.hopto.org/~piro/zaurus/qcl...ge_0.1a_arm.ipk

This is different to QOverclock on the 5500/5000D as the StrongARM CPU uses different registers for controlling the CPU speed. You can downclock your 5600 with this tool and it remembers the CPU speed even when you suspend and resume, unlike the 5500. So the \'Special\' kernel is more flexible.

[ced]

what people should do, is creating an init.d script to set the normal clock speed if they don\'t want to overclock their zaurus. by doing this little trick then we don\'t need multiple kernel... just one.

[Anonymous]

Tumnus, is it supposed to be a .bin file? It shows up as .txt

Thanks

[tumnus]

Shows up as a .bin file for me (which is what it is supposed to be).

[kurochka]

I don\'t seem to find where all these four kernels are.  In the download section there is only one kernel for 5600.  Am I missing something?  I want to be really careful about this.

[tumnus]

Look in this section:
http://www.zaurususergroup.com/modules.php...download&sid=53

[Anonymous]

Hi Tumnus,

   So if the speed using the special kernel is boosted to 471mhz, what is it with just the pre-emptive standard kernel?

 I do see that in the special kernel it uses an c860 source. Also is the wireless extensions in all of above?

 Wouldn\'t the overclocking be present in all of these kernels though?

Thanks
Greg

[tumnus]

So if the speed using the special kernel is boosted to 471mhz, what is it with just the pre-emptive standard kernel?

400Mhz

I do see that in the special kernel it uses an c860 source. Also is the wireless extensions in all of above?

Yes

Wouldn\'t the overclocking be present in all of these kernels though?

No

[Anonymous]

Thank you for the reply. Its becoming clearer to me. These are just kernel upgrades , you can use them with different roms (non Sharp ones). That way if you opt for non sharp ROM , you can still go for the speed increase....

[tumnus]

Well, maybe. It has only been tested with the Sharp ROMs AFAIK. The OpenZaurus ROM, for example, might well depend on something that isn\'t normally compiled into the Sharp kernels.

[Anonymous]

Does the \"special\" overclock by default ? ... Or do you have to install the app mentioned above to overclock it ?

Is it possible to get the \"special\"  without the overclocking out-of the box ?

Cheers
JohnM

[ced]

yes by creating a init.d file like that:

Code: [Select]

#!/bin/sh



echo 0241 > /proc/cccr_change