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.googlesource.com/kernel/goldfish.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 To rebuild the MIPS kernel: 29 30 cd $KERNEL_SOURCES 31 /path/to/rebuild-kernel.sh --arch=mips --out=$ANDROID/prebuilts/qemu-kernel/mips 32 33 Note that you will need to have your cross-toolchain in your path. 34 If this is not the case, the script will complain and give you the 35 expected name. Use --cross=<prefix> to specify a different toolchain. 36 37 See rebuild-kernel.sh --help for more options and details. 38 39 40 II. Rebuilding from scratch: 41 ---------------------------- 42 43 If you don't or can't use the script, here are manual instructions: 44 45 You need to have the Android toolchain in your path 46 (i.e. 'arm-eabi-gcc --version' must work) 47 48 then: 49 50 git clone https://android.googlesource.com/kernel/goldfish.git kernel-goldfish 51 cd kernel-goldfish 52 git checkout origin/android-gldfish-2.6.29 53 54 export CROSS_COMPILE=arm-eabi- 55 export ARCH=arm 56 export SUBARCH=arm 57 make goldfish_defconfig # configure the kernel 58 make -j2 # build it 59 60 => this generates a file named arch/arm/boot/zImage 61 62 NOTE: Branch android-goldfish-2.6.27 is obsolete now. Do not use it. 63 64 Now, you can use it with: 65 66 emulator -kernel path/to/your/new/zImage <other-options> 67 68 69 You can build an ARMv7-compatible kernel image by using goldfish_armv7_defconfg 70 in the above instructions (instead of goldfish_defconfig). Note that you will 71 need to enable ARMv7 emulation by using the -cpu cortex-a8 option, as in: 72 73 emulator -kernel path/to/your/new/zImage <other-options> -qemu -cpu cortex-a8 74 75 As a special convenience, if the name of your kernel image ends in -armv7, then 76 the emulator binary will automatically enable ARMv7 emulation for you, so doing 77 the following should be equivalent 78 79 emulator -kernel path/to/your/kernel-armv7 <other-options> 80 81 82 Voila ! 83
