[Kernel][Eclair][Froyo][CM7][Honeycomb] Dalingrin's OC kernels

Discussion in 'Nook Color Technical' started by lifeisfun, Jan 23, 2011.

  1. lifeisfun

    lifeisfun Member

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    Overview
    -In addition to the general CPU overclock the DSP and possibly the L3 bus are overclocked to levels comparable to other higher end OMAP3 SOCs. This should result in a minor speed up in video decoding among other things. Occip pointed out that the L3 bus is set in the boatloader and kernel values are ignored. I still need to investigate this.
    I feel comfortable with the overvolt used in these kernels for a few reasons. Omap cpus automatically reduce voltage based on load and stability. The voltage gating in omap processors is very advanced. Absolute voltages set in the kernel are only a maximum for a given clock rate. The cpu should seldom reach the defined maximum. In addition the highest overvolt used is very small ~0.05v.​
    Common Features
    -Overclockable to 1100mhz and 1000mhz. Must be set with an app like SetCPU unless running CM7. CM7 has overclocking under Cyanogenmod settings. DO NOT use SetCPU profiles with CM7.
    -****Small overvolt**** compared to the stock 3621 specs. This is running at the same voltage as the omap3630 which is very similar to our CPU.
    -Available clock speeds: 300mhz, 600mhz, 800mhz, 1000mhz, 1100mhz
    -Increased volume on external speaker and headphones
    -Touchscreen workarounds for sluggish response on first boot. This is a workaround/hack from deeper-blue, please thank him for his work!
    -Partial fix for strange touchscreen edge behavior also brought to you by deeper-blue.
    -Various performance tweaks.​
    Now posting all kernels to one directory on mediafire. Be sure to choose the correct kernel for your install!
    Kernel breakdown:

    Eclair Kernels
    -For use with Eclair ONLY.
    DOWNLOADS:
    Free File Hosting Made Simple - MediaFire
    Froyo and CM7 Kernels
    -Froyo and CM7 Only
    -Cache line check race condition backported. Support for CM7.
    DOWNLOADS:
    Free File Hosting Made Simple - MediaFire
    Honeycomb Kernels-This is for Honeycomb v03+ only.
    -Contains code to rotate touchscreen and accelerometer at kernel level
    DOWNLOADS:
    These kernels are not playing nice with honeycomb.
     
    Last edited by a moderator: Mar 7, 2011
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  2. rico2001

    rico2001 Senior Member

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    Nice post lifeisfun. Now I can run 1Ghz more stable than before. This is great news for all those would needed the stock voltage. See Stelv, said there would be more kernels released for the NC.

    Here are the new kernels for those of you not a member over at xda:
    kernel-1ghz.zip
    kernel-950mhz.zip
    kernel-stock.zip

    Again use at your own risk. :)

    Remember, place zip file on root directory of your SD card and wipe cache partition and dalvik cache in CWR before flashing.
     
    Last edited: Jan 23, 2011
  3. lifeisfun

    lifeisfun Member

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  4. rico2001

    rico2001 Senior Member

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    My NC is not liking these new kernels, haven't tried the omap3630 ones yet.
     
  5. rico2001

    rico2001 Senior Member

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    Update: I'm good, just didn't give it enough time to boot. It looked like I was stuck in "nook color" screen, but I wasn't. The first book just takes an unusual 4-5 minutes to boot.

    Wow 1Ghz (with new kernel) is smoking fast !!!
     
  6. rainmakerrc

    rainmakerrc Member

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    Just flashed the new 1.1 ghz kernel. Working great so far!

    Sent from my NOOKcolor Android Tablet using Android Tablet Forum App
     
  7. Dizmatic

    Dizmatic Member

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    These kernels are awesome. Time to try the 1.1 gig kernel. Good stuff.
     
  8. markiej

    markiej Member

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    I jumped right to the "kernel-1100mhz-omap3630.zip" and it booted right up, seems stable, and gave me a quadrant score of 1249. Wow! More importantly, I can actually really feel the zippier performance.

    HOWEVER, it still can't handle standard-def divx movies (using rockplayer) without stuttering and loss of audio-sync. With 1100mhz, this should not require hardware decoding. But I'll stop there since it's not germain to the thread. Well, maybe it is: the 1100mhz kernel is stable and swift, yet will not make your software -decoded videos play more smoothly.
     
  9. MannyPR

    MannyPR Member

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    I am running 1.0ghz and it is very stable and doesn't seem to impact battery life significantly. It feels a lot snappier! No FC's or any other issues so far. Very pleased although was very apprehensive about doing it at the beginning.
     
  10. rico2001

    rico2001 Senior Member

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    Hmm I only got 1207 at 1.1Ghz. :( You running setcpu?

    And the video playback will get better with 2.2, remember 2.1 can only use 256mb of ram.
     
  11. rico2001

    rico2001 Senior Member

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    A few benches from last night, finally match my HTC Evo at 1Ghz running 2.2.

    NC @ 1Ghz running kernel-1000mhz-omap3630
    [​IMG]

    NC @ 1.1Ghz running kernel-1100mhz-omap3630
    [​IMG]
     
  12. bdholsin

    bdholsin Member

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    Outstanding. Thank you for the hard work on these new kernels. I'm rocking on the 1.0Ghz OMAP kernel now. Maybe I'll get brave and try the 1.1 tomorrow. For now I can't see the need for the last 100 Mhz if the current kernel is flying along nicely. I'm quite pleased.
     
  13. rico2001

    rico2001 Senior Member

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  14. bdholsin

    bdholsin Member

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    Yeah, I realized you weren't the originator but I'm not an XDA member and I was hoping the developer was browsing this forum. However, you are the bearer of good news (at least to me) and were willing to give the kernels an early test run so I thought I'd give you kudos.
     
  15. markiej

    markiej Member

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    I tested again later and got 1161. And now I'm not sure about 1249. That's how I remembered it, but who knows - it was 12-something ;)
     
    Last edited: Jan 25, 2011

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