[KERNEL] Bricked-Kernel Grouper/Tilapia

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show-p1984

Inactive Recognized Developer
Jul 30, 2011
3,700
11,805



Welcome to the most customizable N7 kernel on xda:)
Bricked-Kernel Nexus 7 (grouper)


Replaced NVIDIA's strange hotplug manager with my own: tegra_mpdecision

Features:

Based upon Googles tegra3 source
Fixed section mismatches
Various other fixes (look @ github)
Compiled with gcc4.7.2 toolchain (linaro 09.12)
Replaced NVIDIAs hotplug manager with tegra_mpdecision (better battery life + performance)
Extensive sysfs interface for mpdecision with all the tuneables you want
Highly modified ondemand governor for tegra3 & mpdecision (this is the only recommended governor atm)
Fixed usage of 51Mhz clock
GPU OC (416/484/520Mhz)
Truly variant free CPU OC for all devices (51 - 1600Mhz)
Fixed max cpufreq resets throughout the kernel
All cores now use the max frequency (before: only in singlecore, otherwise -100Mhz)
Undervolting (faux123)
Default clocks: 102min & 1300max (+100Mhz overclocked) & 475 Maxscroff
earlysuspend/lateresume for ondemand including special screen off settings to save power
Aroma Installer by amarullz
cmdline interface for cpu min/max/maxscroff/gpuoc/scheduler/governor
---Just flash the kernel with your desired settings, no more need for oc apps. Reflash if you want to change sth. It's that easy!
FSync Control by Ezekeel
export t3 variant to debugfs by faux123 (adb shell cat /sys/kernel/debug/t3_variant)
lowered panel min brightness to 8
ZRAM
enabled NFSv3&4
Check the compare links for the rest :)

Where is tha Changelog???

There will be no more changelogs.
Instead the download pages were outfitted with compare links to github for each download.

How to install?

Flash through recovery. #done.

Where to complain about errors/bugs?

Please use the Issuetracker for bugs/errors/feature wishes!
Issuetracker @ https://code.google.com/p/bricked/issues/entry

[email protected]
IRC Chat: Freenode IRC #bricked

Download:

No Guarantees! If it kills your grandmother or your device, I am NOT responsible! If you understand this:
(If you download, please hit Thanks below my post! Thank you!)

>>> DOWNLOAD <<<




Source:



 
Last edited:

show-p1984

Inactive Recognized Developer
Jul 30, 2011
3,700
11,805
Knowledge base:


What is tegra_mpdecision?

100% kernel based multi core decision! (should cpu1/2/3 be online or not, do we need the low-power/ninja core now?)
This replaces the stock nvidia hotplug solution.

Check /sys/kernel/tegra_mpdecision/conf/ for the configuration.

startdelay = time until mpdecision starts doing it's magic (20000)
delay = time between checks (130)
pause = if something else plugs in the cpu, fall asleep for 10000ms (10 secs)
scroff_single_core = Force low-power mode if screen is off (1)
enabled = enable(1) or disable(0) mpdecision. This does not affect scroff_single_core!
min_cpus = min cpus to be online, cannot be < 1. Default: 1
max_cpus = max cpus to be online, cannot be > 4. (if you set it to 2 and min_cpus to 1 you will basically have a dualcore) Default: 4
idle_freq = a value against that will be checked if a core +/- is requested. (475000)
lpcpu_up_hsyteresis = minimum number of requests that have to be send in order to switch to low-power mode (4)
lpcpu_down_hsyteresis = minimum number of requests that have to be send in order to switch to g-mode (quadcore-mode). Overridden by a requested freq that is higher than the max supported lp-mode frequency. (2)
If cpu0 is below that value and a core up of another cpu is requested, nothing will happen.
If any other cpu is above that value and a core down of that cpu is requested, nothing will happen. (otherwise it would now put down that cpu even though it is still working, which isn't what we want)


Hot plug thresholds (aka now it gets 'complicated')
This small formula calculates which value will be used: (number_of_cpus_online - 1) * 2
The result of this formula will be the nwns_threshold where a new cpu is hotplugged.
The result of this formula + 1 will be the nwns_threshold where a cpu is unplugged.

nwns_threshold_x = runqueue threshold, if this is reached cpuX will be hot/unplugged
twts_threshold_x = time threshold, this amount of time must have passed for the related action to be taken (hot/unplug)

Example:
One cpu is online.
(1 - 1) * 2 = 0 ergo:
nwns_threshold_0 = cpu1 will be hotplugged at this value
((1 - 1) * 2) + 1 = 1
nwns_threshold_1 = cpu0 will be unplugged at this value
This will regulate when we switch to lp-mode, effectively replacing the quadcore g-mode core with the ninja lp-mode core.

Two cpus are online.
(2 - 1) * 2 = 2 ergo:
nwns_threshold_2 = cpu2 will be hotplugged at this value
((2 - 1) * 2) + 1 = 3
nwns_threshold_3 = cpu1 will be unplugged at this value

etc...

(all times are in ms)
If you want to see the mpdecision magic happening:
Code:
adb shell
cat /proc/kmsg | grep 'MPDEC'
mpdecision's input event boost, aka project butter :p

This will boost your min cpu speed if you touch the screen or press a button and gives you full control.
In those events the min cpu freq will be risen to a predefined value (look below) on every online cpu. This boosts overall reaction times and smoothness a lot. (works similar to the qcom mpdecision binary)
Configuration files:
[email protected]:/sys/kernel/tegra_mpdecision/conf # ls
boost_enabled
boost_freqs
boost_time

All of them work like the usual sysfs files, except one special case:
boost_freqs will list all frequencies from cpu 0 to cpu x. Cpu 3 and any following cpu will share one frequency.
To change those frequencies echo the cpu number + the frequency in khz. To change the boost freq of cpu3 (and 4,5,6,7,8, etc) the echo would look as follows:
Code:
echo "3 1026000" > /sys/kernel/tegra_mpdecision/conf/boost_freqs
for cpu0:
Code:
echo "0 1026000" > /sys/kernel/tegra_mpdecision/conf/boost_freqs

Defaults:
Code:
cat /sys/kernel/tegra_mpdecision/conf/boost_freqs
910000
910000
760000
620000
Recommended governor?

Ondemand.
Why do I have no WLAN?

This kernel is too big for our boot.img with WLAN included into the kernel, so it is built as a module. That means it needs to be inserted into the kernel upon boot up, which needs to be automated for maximum comfort = userinit (init.d) support.

The zip adds init.d support to your ramdisk, if that fails for some reason the wlan module cannot be inserted.

if
Code:
adb shell lsmod
doesn't show this:
Code:
tun 14060 0 - Live 0x00000000
cifs 239646 0 - Live 0x00000000
bcmdhd 433083 0 - Live 0x00000000
Then init.d support is probably missing.
You can test it by going to /system/etc/init.d/ and executing 00wlan.
Code:
adb shell
su
. /system/etc/init.d/00wlan

Wait a few seconds and try to enable wifi and repeat the above lsmod command (should now show bcmdhd as live, you can execute 01cifs and 02tun too).
If WLAN now works, init.d support is missing.

You need to have busybox installed in order to be able to get init.d support going, this shouldn't be a problem for most people, since it is usually installed when rooting your phone anyway (and who does unlock but not root their phone? :/)
It does not matter if busybox is installed in /system/bin or /system/xbin, my script will detect the location upon flashing and patch the ramdisk accordingly.
If no busybox is found, the script will add init.d support to your ramdisk with the default location: /system/xbin/busybox. All you need to do is install busybox there and reboot your phone.



 
Last edited:

Dabaum

Senior Member
Apr 22, 2011
86
17
What tweaks did you make to on-demand, if you don't mind me asking? The only thing I've noticed is that frequency switching seems to happen faster & more often.
 

show-p1984

Inactive Recognized Developer
Jul 30, 2011
3,700
11,805
What tweaks did you make to on-demand, if you don't mind me asking? The only thing I've noticed is that frequency switching seems to happen faster & more often.
I mostly adapted it to work with the lpcore while the screen is on and also with special power saving setting while the screen is off.
The 2 phase frequency was changed to accomplish that.
It also applies a powersave bias while screen is off.
Additionally I changed the settings to allow faster scaling with less load. (70% > freq incr)

Source is currently being uploaded, but since I kept the history intact it is taking ages. You can look it up there in more detail once the source is up :)
I tried flashing this a few times and it fails with each try.

With what message?
I guess because your recovery does not identify your device as 'grouper'.
 
Last edited:

show-p1984

Inactive Recognized Developer
Jul 30, 2011
3,700
11,805
It just says failed, I've had no problems flashing anything else and I'm flashing mutilple times a day usually.
It most certainly does not say "failed" and nothing else. Look harder.
Using twrp recovery me and my beta testee had no problems at all.
 

show-p1984

Inactive Recognized Developer
Jul 30, 2011
3,700
11,805
And just to be clear, with non-CM based ones as well? I'm running the 'Glazed' ROM....
As long as it is AOSP you should be fine.
But just try it and report back, then we are all a bit more enlightened :)
(Sorry, I can't possibly test all the ROMs out there ^^)
 

show-p1984

Inactive Recognized Developer
Jul 30, 2011
3,700
11,805
If I try downloading it directly to my tablet the resulting file is only 17.51K in size, downloading it with a computer takes care of the problem.

I get the same. :(

I guess same problem for you StangerWeather.
Try downloading on your pc, I will look into that webserver issue tomorrow. (or maybe it's a chrome issue? who knows ^^)
 
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  • 177



    Welcome to the most customizable N7 kernel on xda:)
    Bricked-Kernel Nexus 7 (grouper)


    Replaced NVIDIA's strange hotplug manager with my own: tegra_mpdecision

    Features:

    Based upon Googles tegra3 source
    Fixed section mismatches
    Various other fixes (look @ github)
    Compiled with gcc4.7.2 toolchain (linaro 09.12)
    Replaced NVIDIAs hotplug manager with tegra_mpdecision (better battery life + performance)
    Extensive sysfs interface for mpdecision with all the tuneables you want
    Highly modified ondemand governor for tegra3 & mpdecision (this is the only recommended governor atm)
    Fixed usage of 51Mhz clock
    GPU OC (416/484/520Mhz)
    Truly variant free CPU OC for all devices (51 - 1600Mhz)
    Fixed max cpufreq resets throughout the kernel
    All cores now use the max frequency (before: only in singlecore, otherwise -100Mhz)
    Undervolting (faux123)
    Default clocks: 102min & 1300max (+100Mhz overclocked) & 475 Maxscroff
    earlysuspend/lateresume for ondemand including special screen off settings to save power
    Aroma Installer by amarullz
    cmdline interface for cpu min/max/maxscroff/gpuoc/scheduler/governor
    ---Just flash the kernel with your desired settings, no more need for oc apps. Reflash if you want to change sth. It's that easy!
    FSync Control by Ezekeel
    export t3 variant to debugfs by faux123 (adb shell cat /sys/kernel/debug/t3_variant)
    lowered panel min brightness to 8
    ZRAM
    enabled NFSv3&4
    Check the compare links for the rest :)

    Where is tha Changelog???

    There will be no more changelogs.
    Instead the download pages were outfitted with compare links to github for each download.

    How to install?

    Flash through recovery. #done.

    Where to complain about errors/bugs?

    Please use the Issuetracker for bugs/errors/feature wishes!
    Issuetracker @ https://code.google.com/p/bricked/issues/entry

    [email protected]
    IRC Chat: Freenode IRC #bricked

    Download:

    No Guarantees! If it kills your grandmother or your device, I am NOT responsible! If you understand this:
    (If you download, please hit Thanks below my post! Thank you!)

    >>> DOWNLOAD <<<




    Source:



    23
    It is sad to see @show-p1984 not updating its kernel anymore.. It had a great start and there it seems to end :(

    Yeah right. Try rewriting half of the i2c transactions just to get a proper transfer when the n7 is sleeping and I will release it asap. Otherwise gtfo with your attitude.

    Some ppl seem to believe I am only sitting around and juggling my balls all day long, so that posting "this kernel is dead" might get me off my lazy ass.
    Just pray that this doesn't backfire one day.
    16
    Knowledge base:


    What is tegra_mpdecision?

    100% kernel based multi core decision! (should cpu1/2/3 be online or not, do we need the low-power/ninja core now?)
    This replaces the stock nvidia hotplug solution.

    Check /sys/kernel/tegra_mpdecision/conf/ for the configuration.

    startdelay = time until mpdecision starts doing it's magic (20000)
    delay = time between checks (130)
    pause = if something else plugs in the cpu, fall asleep for 10000ms (10 secs)
    scroff_single_core = Force low-power mode if screen is off (1)
    enabled = enable(1) or disable(0) mpdecision. This does not affect scroff_single_core!
    min_cpus = min cpus to be online, cannot be < 1. Default: 1
    max_cpus = max cpus to be online, cannot be > 4. (if you set it to 2 and min_cpus to 1 you will basically have a dualcore) Default: 4
    idle_freq = a value against that will be checked if a core +/- is requested. (475000)
    lpcpu_up_hsyteresis = minimum number of requests that have to be send in order to switch to low-power mode (4)
    lpcpu_down_hsyteresis = minimum number of requests that have to be send in order to switch to g-mode (quadcore-mode). Overridden by a requested freq that is higher than the max supported lp-mode frequency. (2)
    If cpu0 is below that value and a core up of another cpu is requested, nothing will happen.
    If any other cpu is above that value and a core down of that cpu is requested, nothing will happen. (otherwise it would now put down that cpu even though it is still working, which isn't what we want)


    Hot plug thresholds (aka now it gets 'complicated')
    This small formula calculates which value will be used: (number_of_cpus_online - 1) * 2
    The result of this formula will be the nwns_threshold where a new cpu is hotplugged.
    The result of this formula + 1 will be the nwns_threshold where a cpu is unplugged.

    nwns_threshold_x = runqueue threshold, if this is reached cpuX will be hot/unplugged
    twts_threshold_x = time threshold, this amount of time must have passed for the related action to be taken (hot/unplug)

    Example:
    One cpu is online.
    (1 - 1) * 2 = 0 ergo:
    nwns_threshold_0 = cpu1 will be hotplugged at this value
    ((1 - 1) * 2) + 1 = 1
    nwns_threshold_1 = cpu0 will be unplugged at this value
    This will regulate when we switch to lp-mode, effectively replacing the quadcore g-mode core with the ninja lp-mode core.

    Two cpus are online.
    (2 - 1) * 2 = 2 ergo:
    nwns_threshold_2 = cpu2 will be hotplugged at this value
    ((2 - 1) * 2) + 1 = 3
    nwns_threshold_3 = cpu1 will be unplugged at this value

    etc...

    (all times are in ms)
    If you want to see the mpdecision magic happening:
    Code:
    adb shell
    cat /proc/kmsg | grep 'MPDEC'
    mpdecision's input event boost, aka project butter :p

    This will boost your min cpu speed if you touch the screen or press a button and gives you full control.
    In those events the min cpu freq will be risen to a predefined value (look below) on every online cpu. This boosts overall reaction times and smoothness a lot. (works similar to the qcom mpdecision binary)
    Configuration files:
    [email protected]:/sys/kernel/tegra_mpdecision/conf # ls
    boost_enabled
    boost_freqs
    boost_time

    All of them work like the usual sysfs files, except one special case:
    boost_freqs will list all frequencies from cpu 0 to cpu x. Cpu 3 and any following cpu will share one frequency.
    To change those frequencies echo the cpu number + the frequency in khz. To change the boost freq of cpu3 (and 4,5,6,7,8, etc) the echo would look as follows:
    Code:
    echo "3 1026000" > /sys/kernel/tegra_mpdecision/conf/boost_freqs
    for cpu0:
    Code:
    echo "0 1026000" > /sys/kernel/tegra_mpdecision/conf/boost_freqs

    Defaults:
    Code:
    cat /sys/kernel/tegra_mpdecision/conf/boost_freqs
    910000
    910000
    760000
    620000
    Recommended governor?

    Ondemand.
    Why do I have no WLAN?

    This kernel is too big for our boot.img with WLAN included into the kernel, so it is built as a module. That means it needs to be inserted into the kernel upon boot up, which needs to be automated for maximum comfort = userinit (init.d) support.

    The zip adds init.d support to your ramdisk, if that fails for some reason the wlan module cannot be inserted.

    if
    Code:
    adb shell lsmod
    doesn't show this:
    Code:
    tun 14060 0 - Live 0x00000000
    cifs 239646 0 - Live 0x00000000
    bcmdhd 433083 0 - Live 0x00000000
    Then init.d support is probably missing.
    You can test it by going to /system/etc/init.d/ and executing 00wlan.
    Code:
    adb shell
    su
    . /system/etc/init.d/00wlan

    Wait a few seconds and try to enable wifi and repeat the above lsmod command (should now show bcmdhd as live, you can execute 01cifs and 02tun too).
    If WLAN now works, init.d support is missing.

    You need to have busybox installed in order to be able to get init.d support going, this shouldn't be a problem for most people, since it is usually installed when rooting your phone anyway (and who does unlock but not root their phone? :/)
    It does not matter if busybox is installed in /system/bin or /system/xbin, my script will detect the location upon flashing and patch the ramdisk accordingly.
    If no busybox is found, the script will add init.d support to your ramdisk with the default location: /system/xbin/busybox. All you need to do is install busybox there and reboot your phone.



    16
    Version 0.58

    Download: Click me

    Nexus 7 3g Support (Google upstream), Audio DAC support, support for Chinese QF9700-based USB Ethernet adapters (diaknia)

    More can be read on bricked.de :)
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