Originally Posted by egoshin

It has nothing with overclocking, it is a bug.

Try this - http://talk.maemo.org/showpost.php?p...3&postcount=62

Originally Posted by titan

the customizable voltage kernel is ready:

Code:

wget http://maemory.com/N900/overclock/generic/kernel-maemo_2.6.28-maemo21_armel.deb 
wget http://maemory.com/N900/overclock/generic/kernel-modules-maemo_2.6.28-maemo21_armel.deb
wget http://maemory.com/N900/overclock/generic/kernel-flasher-maemo_2.6.28-maemo21_armel.deb

online tweaking of voltages is done with

Code:

# cat /sys/power/sr_vdd1_opps_vsel
30 30 38 48 54 48 60 60 60 60 60 60 60 67 72
echo "30 30 38 48 54 48 60 60 60 60 60 60 60 67 72" > /sys/power/sr_vdd1_opps_vsel

The meaning of the voltages (first column):

Code:

stock/normal kernel
30 = 0x1e = 0.975V x 0 MHz = 0
30 = 0x1e = 0.975V x 125 MHz = 119
38 = 0x26 = 1.075V x 250 MHz = 289
48 = 0x30 = 1.200V x 500 MHz = 720
54 = 0x36 = 1.275V x 550 MHz = 894
60 = 0x3c = 1.350V x 600 MHz = 1094
60 = 0x3c = 1.350V x 720 MHz = 1312
60 = 0x3c = 1.350V x 750 MHz = 1367
60 = 0x3c = 1.350V x 810 MHz = 1476
60 = 0x3c = 1.350V x 850 MHz = 1549
60 = 0x3c = 1.350V x 900 MHz = 1640
60 = 0x3c = 1.350V x 950 MHz = 1731
XLV kernel:
30 = 0x1e = 0.975V x 0 MHz = 0
20 = 0x14 = 0.850V x 125 MHz = 90
30 = 0x1e = 0.975V x 250 MHz = 238
33 = 0x21 = 1.012V x 500 MHz = 513
38 = 0x26 = 1.075V x 550 MHz = 636
38 = 0x26 = 1.075V x 600 MHz = 693
45 = 0x2d = 1.163V x 700 MHz = 946
45 = 0x2d = 1.163V x 750 MHz = 1014
48 = 0x30 = 1.200V x 810 MHz = 1166
48 = 0x30 = 1.200V x 850 MHz = 1224
54 = 0x36 = 1.275V x 900 MHz = 1463
54 = 0x36 = 1.275V x 950 MHz = 1544
60 = 0x3c = 1.350V x 1000 MHz = 1823
67 = 0x43 = 1.438V x 1100 MHz = 2273
72 = 0x48 = 1.500V x 1150 MHz = 2588

I have verified that the customized voltages are actually used.
feel free to play with it.
I'm now uploading it to extras-devel.

XLV is: "30 20 30 33 38 38 45 45 48 48 54 54 60 67 72"
ideal: 30 30 30 30 33 38 45 45 48 48 54 54 60 67 72 (first three ignored)
ULV: 25 25 25 33 38 38 45 45 48 48 54 54 60 67 72
LV: 30 30 38 48 48 54 54 54 54 54 54 54 60 67 72

Originally Posted by titan

1) for 125Mhz you need to set 124999. but I don't recommend 125 anyway.
2) videos work perfect for me (ideal kernel settings). do they play if you flash the stock kernel?

Originally Posted by titan

please let me know whether the upgrade worked fine
or whether you had problems. I'm waiting for your feedback before I promote it to testing.

Originally Posted by BlackDiamond

I had your ideal kernel installed, updated throught HAM. Result: Reboot loop
Strange fact, Ihad to reflash the entire PR1.1.1 fiasco image since reflashing only the kernel didn't fix it.

Originally Posted by Stiki

Thanks Titan for the great work
Will you make an xlv package of your kernel maemo22 on your repository ? or the only solution is the "/etc/event.d/kernel-maemo " script?
thx

Originally Posted by jakiman

Flashing from N900 xterminal: (no need for PC): (source)
* do a backup, have a pc nearby and know you are able to flash the n900 with flasher-3.5 - just in case
0. Launch xterminal app then type sudo gainroot (need rootsh installed)
1. type "softupd -vv -s --local" (thats double v)
2. open new terminal
3. type "flasher --local -f -k <kernel_zimage_file_with_path>"
4. you see the flashing (takes some time)
5. type "sync" to save changes
6. type "reboot" and enter to restart
7. Test out your phone as usual. (Apps, browser, camera, phone etc etc)
8. If any abnormal events occur frequently (crash, hang, screen corruption etc), turn it off, flash it to a slower kernel and test again.

Originally Posted by titan

weird! I guess it is related to the different modules directory (-xlv) in the experimental kernels. It would be really interesting to see the output if you upgrade via apt-get
and then to check the /lib/modules directory.
I hope it doesn't affect people who only installed kernels from extras*