1 HOW TO REBUILT THE ANDROID EMULATOR-SPECIFIC KERNEL: 2 ==================================================== 3 4 I. Helper script: 5 ----------------- 6 7 We now provide a helper script to rebuild the kernel, 8 it is under distrib/rebuild-kernel.sh. 9 10 You need the sources in android.git.kernel.org/kernel/qemu.git, 11 in branch origin/android-goldfish-2.6.29 12 13 To rebuild the ARMv5TE kernel: 14 15 cd $KERNEL_SOURCES 16 /path/to/rebuild-kernel.sh --out=$ANDROID/prebuilt/android-arm/kernel 17 18 To rebuild the ARMv7-A one: 19 20 cd $KERNEL_SOURCES 21 /path/to/rebuild-kernel.sh --armv7 --out=$ANDROID/prebuilt/android-arm/kernel 22 23 To rebuild the x86 kernel: 24 25 cd $KERNEL_SOURCES 26 /path/to/rebuild-kernel.sh --arch=x86 --out=$ANDROID/prebuilt/android-x86/kernel 27 28 Note that you will need to have your cross-toolchain in your path. 29 If this is not the case, the script will complain and give you the 30 expected name. Use --cross=<prefix> to specify a different toolchain. 31 32 See rebuild-kernel.sh --help for more options and details. 33 34 35 II. Rebuilding from scratch: 36 ---------------------------- 37 38 If you don't or can't use the script, here are manual instructions: 39 40 You need to have the Android toolchain in your path 41 (i.e. 'arm-eabi-gcc --version' must work) 42 43 then: 44 45 git clone git://android.git.kernel.org/kernel/common.git kernel-common 46 cd kernel-common 47 git checkout origin/archive/android-gldfish-2.6.29 48 49 export CROSS_COMPILE=arm-eabi- 50 export ARCH=arm 51 export SUBARCH=arm 52 make goldfish_defconfig # configure the kernel 53 make -j2 # build it 54 55 => this generates a file named arch/arm/boot/zImage 56 57 NOTE: Branch android-goldfish-2.6.27 is obsolete now. Do not use it. 58 59 Now, you can use it with: 60 61 emulator -kernel path/to/your/new/zImage <other-options> 62 63 64 You can build an ARMv7-compatible kernel image by using goldfish_armv7_defconfg 65 in the above instructions (instead of goldfish_defconfig). Note that you will 66 need to enable ARMv7 emulation by using the -cpu cortex-a8 option, as in: 67 68 emulator -kernel path/to/your/new/zImage <other-options> -qemu -cpu cortex-a8 69 70 As a special convenience, if the name of your kernel image ends in -armv7, then 71 the emulator binary will automatically enable ARMv7 emulation for you, so doing 72 the following should be equivalent 73 74 emulator -kernel path/to/your/kernel-armv7 <other-options> 75 76 77 Voila ! 78
