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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.
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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.
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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.
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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..!!
This thread is somewhat different from others. I am fully aware that overclocking requires a custom kernel however with the Application "Galaxy Tuner" my CPU on my SGS i9000 can go 1.2GHZ with a custom Voodo Kernel not supporting Overclock. I am not sure what method the guy uses and he only allows it to be used 2 minutes at a time, so I was wondering if this would be just as risky / safe to do as going into a new kernel and doing such.
If the first is not possible and I would have to use a custom kernel as it is safer, please PM me some kind of contact information as I am afraid I will break my Phone as I use a custom Voodo kernel + DArkys EXTREME ROM 9.X
Still need to know wheter or not it is safe to overclock the way the application "Galaxy Tuner" does or if its SAFER to do it with a custom OC'ing kernel.
If last, I need some help over Skype / msn
I expect an answer when so many viewed this thread....
cocopara said:
I expect an answer when so many viewed this thread....
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I wouldn't expect anything, just because people like me view it doesn't mean we know anything about it.....why don't you email the author of the app.
spectre85 said:
I wouldn't expect anything, just because people like me view it doesn't mean we know anything about it.....why don't you email the author of the app.
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Exactly, views don't mean answers! It can be frustrating seeing a lot of views and no answer, but you must acknowledge that viewers may be looking for the answer themselves or just plain don't know. Be patient.
Well. Still, I am wondering about the overclocking that The application uses (Galaxy Tuner) because it manages to overclock a phone WITHOUT a custom OC'ing kernel. Hence i am wondering if it is just as SAFE to do as using a custom kernel.
If not, I need some guidance as I dont know how I can switch my kernel and update my ROM
The code to overclock existed on stock kernel sources apparently, it was just commented out.
When OC in this app is enabled, the CPU governor is changed to performance, and the clocks were changed. So I'd wager it's equivalent in terms of safety to a custom kernel.
Why only do the above for 5 minutes at a time when a custom kernel allows you to always have an overlclock? Just use a custom kernel..
I'm using a custom kernel to overclock to 1.2ghz and my battery is exactly the same as it's always been. I'm also underclocking to 100mhz with setCPU when the phone is idle so that's a big help. It's perfectly stable on mine but CPUs can differ so I suggest that if you do flash a custom kernel with overclock that you start lower and stress test just to make sure there are no issues. Also, don't save any voltage control settings as default until you have applied and stress tested.
Also, make sure to keep a spare kernel in zip form and always have backups.
I use super optimized kernel. Though I am looking for a 500-1000 HZ OC kernel. Any suggestion?
I don't know what method this app is using, but just due to my own paranoia I would say using a kernel with OC is safer. Too many horror stories of apps bricking phones due to small errors or badly written instructions.
Beyond that, it just takes experimenting. I am currently using DamienGTO's Ultimate Kernel OCed to 1200 and have had no problems with it, but there are a lot of high quality kernels available down in the Android Development forum. I suggest you install SGS Kernel Flasher from the market (a great app, makes kernel flashing painless and dead simple), download the newest versions of each kernel that says it supports OC, and spend a day flashing and testing. Just remember to disable any OC/UV, lagfixes or tweaks between flashings.
I've done some researching and found out that some kernels are better than the ones the ROMS bring... not sure whether this is true but would like to know if this IS true which kernel is the best you guys have come across that makes games run faster, smoother?
Tips appreciated!
Slash837 said:
I've done some researching and found out that some kernels are better than the ones the ROMS bring... not sure whether this is true but would like to know if this IS true which kernel is the best you guys have come across that makes games run faster, smoother?
Tips appreciated!
Click to expand...
Click to collapse
Well s0be just somewhat recently came out with a new kernel that he states is a release canidate. there is also decafuct. Those are the two i use mainly
Slash837 said:
I've done some researching and found out that some kernels are better than the ones the ROMS bring... not sure whether this is true but would like to know if this IS true which kernel is the best you guys have come across that makes games run faster, smoother?
Tips appreciated!
Click to expand...
Click to collapse
Ideally you should stick with the kernel that comes with your ROM. There are slight differences between the kernels that can cause issues.
For instance, CyanogenMod 7 and its derivatives already contain an up-to-date version of Decad3nce's kernel. So there's no need to flash his (now outdated) kernel over these ROMs. Doing so will break CM7's built-in CPU controls and may cause instability.
On the other hand, some of the older, Sense-based ROMs have software that hasn't been updated to reflect changes in the kernel. These ROMs need kernels designed especially for them.
The best idea in regard to stability is to stay with what you have. If you're feeling adventurous, you should look for an explicit statement of compatibility either in a ROM or kernel developer's thread.
Thanks ill read more about s0be and stick with aosp's default kernel.
Sent from my GingerHERO200 using XDA App
Interesting......I was under the impression that all of the Cyanogen kernels were capped at 691 MHz though? My phone is stable to 748 MHz with virtually every rom I've tried crashes at 768 MHz. I have been using the Decafuct uncapped #589 kernel with RC4, however it doesn't work at all with 7.0.0 stable and the pre-packed kernel seems very sluggish to me compared with how RC4 runs.
Slash837 said:
Thanks ill read more about s0be and stick with aosp's default kernel.
Sent from my GingerHERO200 using XDA App
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Click to collapse
s0be's latest (Ap 5) FTW!!!! Smokin'!
Hi guys. I don't really know anything about the kernels or modems out there, let alone how to pick them. I've searched google, XDA, and other communities for about 2 hours now to try and learn about kernels and modems, but I'm just as confused or possibly naive as when I started, so I have some questions:
1. can you use any kernel/modem with serendipity (or your respective rom) as long as it's designed for your phone?
2. Does the kernel/modem have to be designed for your OS version? i.e. designed for 2.3.3, since that's what serendipity is.
3. which kernel/modem would you guys recommend to use with S7 for improving battery life but not effecting much else? I don't intend to overclock.
Thank you. I'm pretty new to the world of android, but I've got to the point where I'm pretty comfortable with rom flashing. Now, I'm running serendipity 7, loving it, but crying tears of blood over my battery life. full charge will last me 7 hours on what I consider light usage. Mostly idle. I appreciate your help and patience =)
Usually the ROM sit/ thread will tell you which kernels are supported. As far as battery life goes, get a kernel that supports oc/uv and just underclock to about 800mhz and put the voltages down a tad.
Sent from my GT-I9000 using XDA App
1. no (see 2)
2. yes the kernel has to match os versions. And the modem has to match what the kernel is based on (I897 or I9000) but modems are compatible with any os version number as long as it is the same base as the kernel.
3. every phone is different you'll have to just experiment to see what works for you. there really isnt many ginger kernels there are xcal's builds, talon builds, and darkcore (sorry if i forgot any) those are i9000 based reoriented to work with the captivate which Serendipity is I9000 firmware rewritten to work with our phone. any i9000 modem will work with these kernels.
Hello Stefan,
I'm changing ROMs quiet often. Right now I'm on your Hybrid Revolution.
I like it very much - thanks for that.
Now my problem: My Phone is pissed when I use a Kernel witch comes with overclocking. If there is An 'OC' somewhere inside
the kernel's name, my phone gets stuck at the first boot logo.
Now I use temasek's kernel, wich is also fanstastic. But I really like to try yours.
Is it possible to create a 'STOCK' SymbiOsis? Whould be great.
Thanks for your great work.
PS - I still love my O2x.
Frank
Froderik said:
Hello Stefan,
I'm changing ROMs quiet often. Right now I'm on your Hybrid Revolution.
I like it very much - thanks for that.
Now my problem: My Phone is pissed when I use a Kernel witch comes with overclocking. If there is An 'OC' somewhere inside
the kernel's name, my phone gets stuck at the first boot logo.
Now I use temasek's kernel, wich is also fanstastic. But I really like to try yours.
Is it possible to create a 'STOCK' SymbiOsis? Whould be great.
Thanks for your great work.
PS - I still love my O2x.
Frank
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Click to collapse
Hi!
Have you already tried symbi0sis? My kernels have a special patch which restricts cpu speed completely to 1,0 GHz if not overclocked. Other OC kernels have cpu speed "leaks" and peek the maximum speeds for a short time when second core is activated,
Please try the HOC version of symbi0sis (not UHOC)
Stefan Gündhör said:
Hi!
Have you already tried symbi0sis? My kernels have a special patch which restricts cpu speed completely to 1,0 GHz if not overclocked. Other OC kernels have cpu speed "leaks" and peek the maximum speeds for a short time when second core is activated,
Please try the HOC version of symbi0sis (not UHOC)
Click to expand...
Click to collapse
Hello,
thanks for your reply.
Yes, I tried them all. I can even not boot Your gueste Hybrid revolution with the standart kernel, I have to exchange it first.
I just saw that there is a new GUESTE2X STOCK "GoodBye" Rom. I will try this as soon as possible.
Thank you for something new to play with.
Frank