[Q] If we can root,can change system,why can not change kernel or recovery partition

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I am a rookie,sorry.

I believe you can't change the kernel because the (locked) bootloader checks a cryptographic signature on the boot partition before it'll boot it.

You can replace the recovery partition, I thought, but during a cold boot the boot scripts rebuild it from the boot partition. (See /init.rc calling /system/etc/install-recovery.sh although I have no such file on my running phone, I presume it's erased or over-mounted...)

That's why you can battery-pull if your replacement recovery is broken, as long as it doesn't prevent reaching that far into /init.rc...

Originally Posted by mvp3

I am a rookie,sorry.

Because the Droid 3 bootloader is locked down unlike the original Droid 1. Without a unlocked bootloader it is impossible for custom kernels or fully custom recoveries.

Does this also mean we will be unable to flash the new Linux 3.0 kernel (where ICS runs on)? No idea if that would matter though..

Originally Posted by rvschuil

Does this also mean we will be unable to flash the new Linux 3.0 kernel (where ICS runs on)? No idea if that would matter though..

We already have ICS booting on D3... it will be a couple months until there is a decent beta available though.

Originally Posted by rvschuil

Does this also mean we will be unable to flash the new Linux 3.0 kernel (where ICS runs on)? No idea if that would matter though..

The only way to change the kernel is with an official update from Motorola or an unlocked bootloader. The ICS we will likely see first for this phone will be a custom build (Hashcode) which will be built on the the kernel we currently have.

Sent from my DROID3 using XDA App

Originally Posted by mikedyk43

The ICS we will likely see first for this phone will be a custom build (Hashcode) which will be built on the the kernel we currently have.

According to the kernel version in Hashcodes ICS build it actually is different than our stock kernel. Not saying that is the kernel that will be in ICS (or if its truely different) but it is indeed a different #