Root Flashing kernels separately from ROMS

mtneer25911 · Mar 29, 2011

Can someone please clarify why we have to flash kernels separately from ROMS on the Thunderbolt? Is this an issue with Clockwork recovery? In the past I have owned the original Droid and kernels could be included directly in the ROM, and the Droid X where we never had to worry about kernels since we couldn't replace them anyways. I am hoping it is a temporary issue and eventually we wont have to use fastboot or PG05IMG.zip files for kernels, as it becomes a pain when reverting back to previous backups.

Anyone care to shed some light on the subject?

Thanks

travishamockery · Mar 29, 2011

I just used Rom Manager to flash the new kernel in there...worked fine. Give it some time I think, phone and all this are still new, things will smooth out.

WormDoes · Mar 29, 2011

Kernels are not able to be flashed through CWM at this time. It's a problem with CWM and Koush is working on a fix.

travishamockery · Mar 29, 2011

I definitely used ROM manager and under my phone info it shows the new kernel. Maybe it's working?

howarmat · Mar 29, 2011

i flashed a kernel using CWM with no issue just a couple hours ago.

Padron26 · Mar 30, 2011

what is the advantage of flashing kernels

scotty85 · Mar 30, 2011

howarmat said:
i flashed a kernel using CWM with no issue just a couple hours ago.

maybe you had no issues,but are you certain it worked? is the new kernal listed in your phone info? did the developer provide a .zip that was intended to be flashed in CWM?

Padron26 said:
what is the advantage of flashing kernels

kernals can be tweaked just like the rest of the rom. they can be under or over volted,among other things,to make them bigger/better/faster/stronger

travishamockery · Mar 30, 2011

scotty85 said:
maybe you had no issues,but are you certain it worked? is the new kernal listed in your phone info? did the developer provide a .zip that was intended to be flashed in CWM?

kernals can be tweaked just like the rest of the rom. they can be under or over volted,among other things,to make them bigger/better/faster/stronger

I'm certain it worked, it shows clearly in software information. Also, per his post on XDA:

INSTALL VIA CLOCKWORK! Last edited by Mrbobrowitz; Yesterday at 11:01 PM.

bjanow · Mar 30, 2011

howarmat said:
i flashed a kernel using CWM with no issue just a couple hours ago.

Me too.

bjanow · Mar 30, 2011

mtneer25911 said:
Can someone please clarify why we have to flash kernels separately from ROMS on the Thunderbolt?.....

Anyone care to shed some light on the subject?
....

You don't really. Most roms will have a kernel that comes along with it, most often optimized as best the rom dev could do. But you can also flash a kernel by a "kernel specialist" that will tweak other settings you might want. Either way, it's a little early for this since everyone is focused on OC and linpack scores for some reason. I'm just kicking back for CM7 with whatever kernel they pack with it, unless it doesn't include smartass. Then I flash another kernel.

ska.t73 · Mar 30, 2011

According to Adryan and Mr. Bobowitz, the problem wasn't with CWM. The problem was the devs needing to figure out how to get the kernel zips to work with CWM, apparently the source code helped them fix it.

cmotion · Apr 3, 2011

Can someone give me a quick run-through of flashing a kernel using Clockwork? I used to have a rooted Eris and was familiar with flashing things via Amon_RA's recovery, but I've never used ROM Manager, or Clockwork Mod or any of that stuff. Would be much appreciated!

scotty85 · Apr 3, 2011

my advice is to avoid rom manager. use clockwork recovery,its very similar to using Amon_RA.

you flash a kernel just like you do a rom,but dont do any wipes.

-place kernels .zip file on root of sd card.
-boot into clockwork recovery
-flash zip from sd card
-reboot

cmotion · Apr 3, 2011

scotty85 said:
my advice is to avoid rom manager. use clockwork recovery,its very similar to using Amon_RA.

you flash a kernel just like you do a rom,but dont do any wipes.

-place kernels .zip file on root of sd card.
-boot into clockwork recovery
-flash zip from sd card
-reboot

OK, booting into recovery by volume down + power?

WormDoes · Apr 3, 2011

scotty85 said:
my advice is to avoid rom manager. use clockwork recovery,its very similar to using Amon_RA.

you flash a kernel just like you do a rom,but dont do any wipes.

-place kernels .zip file on root of sd card.
-boot into clockwork recovery
-flash zip from sd card
-reboot

Some developers recommend wiping cache and dalvik before flashing a Kernel. It really doesn't hurt and it removes a step if the Kernel isn't stable. If you wipe first and it's buggy you can try a different kernel versus going back into CWM and wiping then trying the same Kernel again.

WormDoes · Apr 3, 2011

cmotion said:
OK, booting into recovery by volume down + power?

Yes, or you can d/l an app called Quick Boot and use that to boot into CWM

scotty85 · Apr 3, 2011

WormDoes said:
Some developers recommend wiping cache and dalvik before flashing a Kernel. It really doesn't hurt and it removes a step if the Kernel isn't stable.

when said "no wipes",i actually ment "no data wipes",thanks for catchin it,i shoulda been more clear :eek:

WormDoes · Apr 3, 2011

scotty85 said:
when said "no wipes",i actually ment "no data wipes",thanks for catchin it,i shoulda been more clear

It's all good. I figured you knew what was up, but I just wanted to make sure cmotion knew what to wipe

cmotion · Apr 3, 2011

WormDoes said:
It's all good. I figured you knew what was up, but I just wanted to make sure cmotion knew what to wipe

Oh, I know what to wipe alright...

...not sure where I was going with that one. Anyway, my main reason for wanting to flash a new kernel is to try to improve battery life. It's not as bad for me as a lot of people were making it out to be (or maybe I'm just more understanding about the freakin' super computer I carry around in my pocket?), but if I can get a good undervolting kernel to help with some battery life that'd be awesome. Has anyone tried Adrynalyn's newest (v2.0) kernel? I see Worm you're on Das BAMF, how's battery life there? I've downloaded setCPU to turn down the frequency with the screen off, but I'm not sure I'm noticing much of a difference, so I wanted to try maybe flashing a different kernel. With that one I mentioned, I think it's set to smartass by default, which I've heard may help with making the battery last longer? For me personally, I see no need to overclock this thing yet, especially coming from the Eris (which has AMAZING devs who helped make the phone usable for so long after EOL)... I'd just like to squeeze a little bit more out of the battery, if possible.

scotty85 · Apr 3, 2011

i unplugged early this morning and just a lil bit ago was at 73%... its amazing how much longer the battery lasts when you dont really use it

i normally have talked a couple hours on it,played some games,and repeatedly checked email and the forums.

i was on das_bamf with the supplied kernel,set to smartass and no profiles. if you dont play with it constantly(like i normally do) im pretty impressed with the battery in this setup.

i just flashed the das de-sensed,ill see how it does there

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