Database Develop

Difference between ROM and Kernel?

Hello,
Sorry for this very basic question, I am just wondering what is the difference between a Kernel and a ROM? I see in the development forum there are lots of new Kernels, what are these actually optimizing except underclocking or undervolting (understand that terminology). I am also wondering if the Kernels are specific for the original Nexus One 2.1 Android or can you install for example Modaco or Cyan ROM and then a different random Kernel?
Thanks!

To my understanding, a kernel is what directly interacts with the hardware. Every OS has this, but it's more customizable on our phones since it's based on Linux. The Rom contains the OS itself, and the software and file structure therein. The kernel even can tell the OS how fast the processor goes and how much juice to use from the battery.
Hope that makes sense, as I'm no expert. You can mix and match the two as far as I know. I've mixed them, anyway.

Halorin,
Based on what you said, with my stock vibrant ROM 2.1 JI6 update, it is possible to change the kernel or install another kernel (like the CM kernel)?

tomasitoc said:
Halorin,
Based on what you said, with my stock vibrant ROM 2.1 JI6 update, it is possible to change the kernel or install another kernel (like the CM kernel)?
Click to expand...
Click to collapse
That is really a question better suited to the rom 's development thread, but in general yes you can flash a different kernel. Some kernel/rom combinations work better than others, but you really wont know until you try. Get comfortable with nandroid backups and start trying out different kernel combinations until you find one you like.

Usually most custom roms will include a kernel but they usually have tweaks like coding for 720p, oc, and audio tweaks and what not. Alsways do a nandroid back up and start exploring. When flashing kernels always wipe, I think their are exceptions but its best to wipe just in case. Browse XDA, download a kernel from your phone browser, rom manager install from SD, should be in your downloads folder, backup and wipe, repeat until your phone does what you want.
Sent from my Nexus One using XDA App

which is the better to install???
Thank you your post..
but i can't understand clearly.
so.,
which one is better to install NewRom / Kernal. for android phones.

Neither one is better it just depends on what you want to do.
If you want to totally change over your phone to look and function differently then you need to flash a ROM if you just want to keep the same look but want to enable lets say overclocking then flash an overclocked kernel. If it has to do with the hardware mostly then it's probably something that the kernel can change. Although like mentioned above if you flash a ROM most of the time it will come with a custom kernel.

Dude Random21 said:
Neither one is better it just depends on what you want to do.
If you want to totally change over your phone to look and function differently then you need to flash a ROM if you just want to keep the same look but want to enable lets say overclocking then flash an overclocked kernel. If it has to do with the hardware mostly then it's probably something that the kernel can change. Although like mentioned above if you flash a ROM most of the time it will come with a custom kernel.
Click to expand...
Click to collapse
What he said.
ROMs and kernels are two separate things that have two separate functions. Neither is better than the other, but they do complement each other.

Seshu9899 said:
Thank you your post..
but i can't understand clearly.
so.,
which one is better to install NewRom / Kernal. for android phones.
Click to expand...
Click to collapse
I know both Dude Random21 and codesplice have gone into this, but to try and give a bit more info...
The kernel is kinda like the nervous system of the body. It directly interacts with the hardware (which is how it is able to adjust CPU speed) and it is what allows the ROM to function.
The ROM is the rest of the body. Every other aspect of the phone. In fact, most ROMs include custom kernels. Various ROMs give you various features/enhancements/bugfixes. You will probably notice the biggest change in your phone if you load a custom ROM. Most people load the custom kernels to help with battery life as a lot of them allow you to lower the phones minimum processing speed from 245Mhz to 128MHz.
The ROM can change so many different aspects of how the phone works. There is CyanogenMod which is based off of stock Android with a lot of tweaks, bugfixes, and new features added. There is also MIUI, which is similar to the iOS style (not the same, but much closer than stock Android), and then there are a ton others out there.

Then which Rom is best for my samsung galaxy s???
so i am using froyo.jpjpg on my galaxys.
i want to flash new Rom with upgaraded to gingerbread.
can i flash only rom../ kernal also.
which is best Rom for samsung galaxys.
cynogenmod, miui, .?????
battery drain is very fast now ian running rom/kernal.

Start by going to the forum for your phone.
Sent from my Nexus One using XDA App

thank you...
i Start the post from samsung galaxy s..

Seshu9899 said:
thank you...
i Start the post from samsung galaxy s..
Click to expand...
Click to collapse
your welcomed

Nandbackup + Rom & Kernel
One question: when I do a backup with CWM, it is the Nandroid backup you talk about, correct...? Same thing? So, if I do a backup with CWM, it's a backup only of the ROM, or also the stock Kernel...? Imagine that I do a Rom (GingerDX for example), and flash with a custom Kernel.... If things go bad and I do a restore from my backup (stock) CWM, what do I restore? Rom, or Rom + (stock) Kernel...?

Yes, a backup that is done in ClockworkMod (or Amon_RA) is considered a nandroid backup. And this takes a complete snapshot of your system. Your ROM, your kernel, your apps and your data are all inlcuded. The only thing that isn't included is the fat partition on your sdcard. So if things go bad and you restore your nandroid backup, it will go back to however it was when you made the backup.

thanks a lot. reading this thread clear up a lot of things

Hi!
I am currently running Lite'ning ROM 6.1. XXKH3 Kernel version 2.6.35.11-ninphetamine-2.0.5+ [email protected] #20 on SGSII. Phew.
I've tried a lot of ROMS including MIUI, villain, galmetMIUI ICS version . I like Lite'ning ROM because it gave me the least (virtually Nil) problems (FCs/ reboots) and has almost all the features I need (TV-out that's missing from MIUI, good camera with panorama mode, Recording mode in phone). However I miss the CIFS feature. Is it because the kernel does not support it? Can I get CIFS support if I flash another kernel? Any suggesstions on which Kernel should I flash? I realise that this ROM is pretty old now so Can I get additional features with a newer Kernel.

codesplice said:
What he said.
ROMs and kernels are two separate things that have two separate functions. Neither is better than the other, but they do complement each other.
Click to expand...
Click to collapse
That made everything clear. Thanks man. I'm new to the xda but already flashed a new rom that overclocked my CPU to 1.5 and my HTC Sensation 4G Is running so much better right now. However I wish i knew how to thank people... because i see the thanks meter but cannot find where to thank from.

radoslav.trahanov said:
That made everything clear. Thanks man. I'm new to the xda but already flashed a new rom that overclocked my CPU to 1.5 and my HTC Sensation 4G Is running so much better right now. However I wish i knew how to thank people... because i see the thanks meter but cannot find where to thank from.
Click to expand...
Click to collapse
The rom didn't overclock your phone. The kernel did. READ. You came to the MT4GS forum starting up a storm for people not giving you a direct link to the regular MT4G. How is it you cant find the freakin' "thanks" button? THERE'S A FREAKIN' THANKS BUTTON IN EVERY FREAKIN' POST. OPEN YOUR FREAKIN' EYES.

Sori m jst new here..jst b0ught my f0ne 2 m0nths ago. Flashed r0m: gingercrime ITA, flashed kernel: ver 2.6.35.14 v6. And iv overclock my fone 245-710Mhz, smartass. fone: lg optimus one, running on gingerbread 2.3.3
Many thanx xda developers..!!

Overclocking the Stock Rom on Heroc

I like the stock ROM because it works. I think all I really need is root access and overclocking to have a good fast phone. What would be the best kernel to use with it if all I want is overclocking? Is not having a custom ROM a stupid idea?

Here's your ROM:
http://forum.xda-developers.com/showthread.php?t=703267
It's basically the stock Sprint 2.1 ROM that's been de-odexed. I use it and am plenty happy. If you like the stock Hero look and feel, then you'll be plenty happy with this ROM.
I'm also using an overclock kernel. You can use the SetCPU app (available for free elsewhere on this site) to fine-tune your max and min CPU clock speeds.
Here's a link to a whole family of overclock kernels, some of which were cooked up specifically to work well with the above-mentioned ROM:
http://forum.xda-developers.com/showthread.php?t=705074
I've been using the regular 710mhz version of kernel listed for that ROM, but yesterday I loaded the 710mhz undervolt version just to see if my battery life would benefit any. Not that my battery life is a problem at all, though...in fact I've been getting GREAT battery life with the regular 710 mhz kernel I was running before.

I am using the same Rom but I seem to have issues with the OC kernels specifically for the Rom. I use the DarchHoneyOCV3 kernel and do not seem to have any issue with that one.

Tibedabeeto said:
I am using the same Rom but I seem to have issues with the OC kernels specifically for the Rom. I use the DarchHoneyOCV3 kernel and do not seem to have any issue with that one.
Click to expand...
Click to collapse
That's the same kernel I was using before I went to the UV 710mhz for nfinitefx45...DarchHoneyOCV3 is a good kernel for sure, can't find fault with it.
Forgot to mention in my previous post, the reason I recommend the nfinitefx45 ROM is because it includes apps2sd, which lets you put your apps on the sd card and frees up active RAM (hope I stated that correctly). I never worry about running out of memory any more. And for all intents and purposes, it looks, feels and acts just like the factory Sprint 2.1 release. When you're done with the install, just use your phone like it was completely factory stock (only faster and smoother) if that's what makes you happy. On the other hand, if you want you can install the SetCPU app and tweak it however you want.
Don't be afraid to take the plunge, parrothead. You'll be in good company. And you almost can't go wrong going with the same combination Tibedabeeto did, as long as you can follow simple directions (I know I should put a disclaimer in there somewhere, LOL).

[Q] Kernels / UV / Freezing

I tried using both MicroMod's Sense Hybrid and Rodriguez's MIUI mod ROMs and found that both caused my phone to freeze or not wake up.
I've started using Enomther's and that has been fine for a few weeks, so I'm assuming it was freezing due to low tolerance of undervolting on those ROM kernels. I'm happy with Enom's, but would still like to occasionally try out other ROMs. What can I do to prevent this when trying out alternative ROMs? Is there a good universal kernel that isn't UVed but has 720p support?

djmasque said:
I tried using both MicroMod's Sense Hybrid and Rodriguez's MIUI mod ROMs and found that both caused my phone to freeze or not wake up.
I've started using Enomther's and that has been fine for a few weeks, so I'm assuming it was freezing due to low tolerance of undervolting on those ROM kernels. I'm happy with Enom's, but would still like to occasionally try out other ROMs. What can I do to prevent this when trying out alternative ROMs? Is there a good universal kernel that isn't UVed but has 720p support?
Click to expand...
Click to collapse
You could stick with whatever ROM you want and try out a few different kernels to see what works on your device. IntersectRavens have a pretty good following, and pershoot's are pretty much the standard. I have had awesome results with wildmonk's but I think most of his are undervolted.

[POLL]Wich's The Best Gingerbread ROM ?

XDAmembers, this is a poll for know wich rom is the faster

If you include Hobomod, which is based on Shadowmod, then include also Ho!no! and iceandfire which are based on CM7.
Also, you should remove the version numbers from the poll, as those are changing quite fast, and they are already outdated.
Add the missing stuff & I'm sure many people will find the poll useful.

Do include Cronos Gingerbread!

There is already a poll that is ongoing:
http://forum.xda-developers.com/showthread.php?t=953971
Thus it might be better to do another one 2-3 weeks from now, that more updates would come out!

ShadowMod without a doubt!

http://www.cronosproject.org/forum/viewtopic.php?f=59&t=776&sid=cbe18f8fc7bccde458a276108a76a697

jackeh070 said:
If you include Hobomod, which is based on Shadowmod, then include also Ho!no! and iceandfire which are based on CM7.
Also, you should remove the version numbers from the poll, as those are changing quite fast, and they are already outdated.
Add the missing stuff & I'm sure many people will find the poll useful.
Click to expand...
Click to collapse
How do i change Poll options??? I'm bit noobish regarding forum stuff

I've been very pleased with Liquid Gingerbread v1.12.

ShoadowModb6 with newest kernel and 1000/550/250/125 overclock has been working great for me for a week now

I think HO!NO! mod is great.
But ALL of these ROMs can not play video on my Milestone. Any one seen this problem and how to resolve it?

LuigiC6 said:
ShoadowModb6 with newest kernel and 1000/550/250/125 overclock has been working great for me for a week now
Click to expand...
Click to collapse
how is the free memory and the speed compared with b3 ??

I love the new rom from IceandFire [ROM-AOSP 2.3] iceandfire v1.0 (2011-2-20)
It´s fast and no resets, Love it !!!

CyagonMod7 is one of the best Gingerbread's I think. I like, but never tested the other.

merb said:
CyagonMod7 is one of the best Gingerbread's I think. I like, but never tested the other.
Click to expand...
Click to collapse
I have been using only CM. However latest CM7 0.07 has memory issue. Phone lags after a day of moderate use, free RAM hardly reach over 35MB.

I'm waiting for CM7 to turn into a release candidate before I attempt to test it out...

Cyanogenmod 7 definitely!

I vote to Shadow! It's very smooth!

Does anyone know if ProjectEliite V5 is a full Gingerbread ROM, or does it use Froyo as it's base with bits and pieces of GB?

[Q] Trystan34 Help

Hi there,
I am new to rooting and flashing etc
I have an LG Optimus 2X
I want to over clock my phone to 1.5GHz
I still have stock rom on froyo 2.2.2
LG-P990
Baseband 1035.21_20110614
Kernel version 2.6.32.9
Build number FRG83G
LGE Version LGP990-V10c
I have rooted with super one click.
Can someone please help me? I want to over clock to 1.5GHz and make it fast as possible. Could you please tell me step by step how to do this and what rom to use. I am currently on the stock rom. I have made a back up using rom manager. I have backed up all my apps using Titanium Backup. I may need another method for Nandroid Backup.
I heard that the update to Ginger bread was not good and has a bad camera app not like in 2.2.2. Is the rom and kernel that gives you 2.5GHz e.g. CM 7 going to be a different camera app to the one in froyo?
Thanks

Alright, luckily you have rooted so I don't have to explain that ...
First of all a titanium backup will just do fine so don't worry about that.
Second if you want to overclock you need to flash a custom overclock kernel on your phone. You can find many of those in the dev section of course. There are even custom overclock kernels for stock rom if you rather want to have stock instead of MIUI or CM.
So flashing a kernel goes as follows...
1. Download the kernel (duh.... )
2. Reboot into recovery
3. Wipe Cache and Dalvik Cache
4. Flash Kernel
(this will only work for you if you want to flash a custom kernel for stock roms of course)
Then your next question...
Uhm... Yeah, I think it's true that the camera app on Froyo is better than on other roms. At least that's what I've read in the many threads here on XDA.
Hope this helped
Sent from my Optimus 2X using xda premium

WOW!! Thanks for the fast reply!! On other sites I would wait one day for an answer!
I would like to try cm7.1 stable but I am not sure if I would like it and I have never flashed a rom so a bit nervous.
What are you running currently?

Haha, but this is not just some other site this is XDA!
Currently I'm running a CM7.2 KANG + IronKernel with vadonkas Powersave patch. You can find IronKernel in the dev section of course.
If you want to try CM then I think you should also try a. CM7.2 KANG. Those are better than just ordinary CM7.0.1. Note that if you want to try cm, you have to do a full wipe in recovery mode (wipe data, cache, dalvik) but you can always restore your data with titanium backup.
What you also could do in case everything goes wrong (I highly doubt it) is to make a total rom backup from your stock rom so you can always go back to stock. You do this by going to ROM manager and click on backup ROM. To restore the backup you go to recovery and click on restore backup.
Personally I like CM more than any other rom because it's very smooth and has a nice UI. But this of course is just a matter of taste.
Sent from my Optimus 2X using xda premium

Is there really a kernel thaf allows overclocking to 1.5ghz on o2x? Because I only know spica's Horse power kernel did implemented it, but because there are so few devices that can run 1.5ghz stable, it was dropped back to 1.4ghz.

In fact there are many kernels which can run 1.5 Ghz stable. For example IronKernel, VorkKernel and Swiftextreme you can find them all in the dev section.
Sent from my Optimus 2X using xda premium

You should precise that the above kernels are only for CM7.
On stock ROMs you can use Spica's kernels and FPS dr4go's ones.
On stock ROMs it was decided to get rid of 1.5 as depending of hardware flaws, some had great instability, and no real gain compared to 1408 MHz.
AFAIK, those speeds are not necessary for daily use... You won't gain much subjective smoothness I guess, with a good kernel at stock speed it's very snappy.
But you'll loose battery much more faster. Even 'non Tegra Zone' games are very fluid at stock speed, as most of them have been designed for monocore phones...
The only gain should be if you regularly read MKV HD films.

SP1996AC said:
Haha, but this is not just some other site this is XDA!
Click to expand...
Click to collapse
Haha. What is KANG?

Striatum_bdr said:
You should precise that the above kernels are only for CM7.
On stock ROMs you can use Spica's kernels and FPS dr4go's ones.
On stock ROMs it was decided to get rid of 1.5 as depending of hardware flaws, some had great instability, and no real gain compared to 1408 MHz.
AFAIK, those speeds are not necessary for daily use... You won't gain much subjective smoothness I guess, with a good kernel at stock speed it's very snappy.
But you'll loose battery much more faster. Even 'non Tegra Zone' games are very fluid at stock speed, as most of them have been designed for monocore phones...
The only gain should be if you regularly read MKV HD films.
Click to expand...
Click to collapse
Oops yeah you're right
A KANG is a CM rom but then developed by some developers outside cyanogen. They use cyanogens source code and improve it to as they want. Often they put new or other things in the rom those are referred as cherry-picks. So a KANG is actually an improved CM stable ROM.
Sent from my Optimus 2X using xda premium

Ok. Thanks.
Could you please provide links for all the files I need?

They are all in development section, easy to find ...
http://forum.xda-developers.com/showthread.php?t=1421425
http://forum.xda-developers.com/showthread.php?t=1359307
http://forum.xda-developers.com/showthread.php?t=1414507
http://forum.xda-developers.com/showthread.php?t=1295486
plus all custom stock based ROMs with most of the time custom kernel included:
http://forum.xda-developers.com/showthread.php?t=1334220
http://forum.xda-developers.com/showthread.php?t=1334220
http://forum.xda-developers.com/showthread.php?t=1405012
http://forum.xda-developers.com/showthread.php?t=1410662

Thanks but I honestly don't know which one to flash
How do I get all this CM7.2 KANG + IronKernel with vadonkas Powersave patch?
What is the vadonkas powersave patch?
Is the CM7.2 KANG a single rom?

Yes. Flash the ROM in first of my previous answer (Temasek's Kang). Then grab Ironkernel in the kernel thread (http://forum.xda-developers.com/showthread.php?t=1359307).
Vadonka : it's a script you add to any ROM you want, here: http://forum.xda-developers.com/showthread.php?t=1310272&page=12 .... Search in posts Vadonka's signature, there are links for his script.

You should be aware that cm7 is nothing like stock LG roms. CM7 has original gingerbread looks and feel.

Thank you.
I am going to flash soon just a few more questions.
In the Ironkerne download page there are lots of files and there is:
ironkrnL32-20120103h0852.zip
ironkrnL96-20120103h0852.zip
ironkrnL64-20120103h0852.zip
Which one must I get the 32, 96 or 64?
Temasek's Kang:
He said "I've not tested those bluetooth stuffs I just added, so don't ask me."
Does this mean bluetooth might not work?
vadonkas Powersave patch:
Is the "CM7 kernel only (version: 2.6.32.45) for O2X" one I must use?

tablighs said:
You should be aware that cm7 is nothing like stock LG roms. CM7 has original gingerbread looks and feel.
Click to expand...
Click to collapse
Would it be difficult to use? I use Go Launcher ex for home screen. I also use Widget Locker Lockscreen for lockscreen. Does this hide the gingerbread looks and feel?

Trystan34 said:
Thank you.
I am going to flash soon just a few more questions.
In the Ironkerne download page there are lots of files and there is:
ironkrnL32-20120103h0852.zip
ironkrnL96-20120103h0852.zip
ironkrnL64-20120103h0852.zip
Which one must I get the 32, 96 or 64?
Temasek's Kang:
He said "I've not tested those bluetooth stuffs I just added, so don't ask me."
Does this mean bluetooth might not work?
vadonkas Powersave patch:
Is the "CM7 kernel only (version: 2.6.32.45) for O2X" one I must use?
Click to expand...
Click to collapse
Hey again
IronKernel also comes with a ramhack for your phone. So 32, 64 and 96 just means the amount of extra mb ram for your phone.
However note that this ramhack also comes with a prize namely:
32 MB = no reboot possible
64 MB = 1080 p video recording and reboot doesn't work
96 MB = no reboot and no 1080 p/720 p video recording and some heavily textured 3d games might not work. Also for some reason the camera doesn't work either.
More info: http://forum.xda-developers.com/showthread.php?t=1359307
Second question:
It might not work, but you can always try it or just read the replies from other users. They'll inform whether it works or not. However you can assume that it works since it's a fairly recent KANG.
Third Question:
Yep, just flash it right over your IronKernel. You might want to wipe cache and Dalvik first. (at least that's what I did)
Or what you also could do is directly flash vadonkas hybrid on your phone. This contains already the latest IronKernel with patch.
Then your last question:
I'm using Go Launcher and widgetlocker too and yeah it will hide the gingerbread theme definitely if you install other themes for cm and for Go Launcher. Like for example ICS.
Sent from my Optimus 2X using xda premium

I don't need a ram hack.
What is ICS?
All I want to do is use a new good rom that has not bloat ware and stuff to slow it down, over clock to 1.5 and when screen is off under clock to save battery.
Now I don't want to do a ram hack since I don't know what it is or why I need it.
I am now confused. please help.

Bluetooth works since long in CM (that means a couple of month at least lol), but to test A2DP (bluetooth audio pairing to listen music on external devices) you must have... a dedicated device, and probably Temasek doesn't have one.
I don't kown anything in IronKernels, I don't use CM7 anymore.
If you want to try stock without bloat I think Gueste 2X is a good choice. I clearly think 1.5GHz OC is not a critical point to evaluate a ROM/Kernel.

What's gueste 2x??