From: eLinux.org

Android Kernel Versions

Contents

Kernel versions known to run Android

2.6.23

The first-generation Google-TV products (released about November, 2010)
used kernel version 2.6.23. It is speculated that this is due to
existing binary driver support for the Intel chipsets used in those
products.

2.6.25

The original (version 1.0) of Android for the G1/ADP1 used Linux version
2.6.25

2.6.27

The 1.5 release of Android (cupcake) for the G1/ADP1 used Linux version
2.6.27

2.6.29

As of September, 2009, the kernel/common.git tree for Android has a
2.6.29 kernel. Donut uses this kernel.

2.6.32

As of July 2010, the kernel/common.git tree for Android has a 2.6.32
kernel. This kernel is used by Froyo.

2.6.35

Gingerbread used kernel version 2.6.35.

Selecting a kernel tree for a new port

This article has good information on porting Android to a new device.
Note that it debates which kernel tree is appropriate to start with, for
porting to a new device:

Android git kernel trees

As of July 2010, the android repository on
kernel.org had the following kernel
trees:

kernel/common.git
This is the kernel tree that matches what is put into official Android
products by Google or its partners

kernel/experimental.git
some experimental stuff

kernel/linux-2.6.git
mirror of Linus’ kernel tree. This is a reference for the kernel tree
used in Android

kernel/lk.git
not a kernel tree, but a bootloader

kernel/msm.git
kernel for MSM (Qualcomm chip used in many HTC products)

kernel/omap.git
mirror of kernel tree maintained by texas instruments., supporting OMAP
chips. usually based on kernel.org latest version, android products w
OMAP chip can use this kernel port.

kernel/tegra.git
nvidia kernel tree

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