page.title=Android Kernel Configuration
@jd:body

<!--
    Copyright 2013 The Android Open Source Project

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

        http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
-->
<p>The kernel configuration settings in this document are meant to be used as a base for an Android kernel configuration. All devices should have the options in android-base configuration enabled. While not mandatory, the options in android-recommended configuration enable advanced Android 
features.</p>

<p>
Generating kernel config: Assuming you already have a minimalist defconfig for your device, a possible
way to enable these options would be:</p>

<pre>ARCH=<arch> scripts/kconfig/merge_config.sh <path_to>/<device>_defconfig android/configs/android-base.cfg 
android/configs/android-recommended.cfg</pre>
<p>
This will generate a .config that can then be used to save a new defconfig or
compile a new kernel with Android features enabled.
</p>
<h3>
Base Configuration
</h3>
<pre>
CONFIG_EXPERIMENTAL=y
CONFIG_SYSVIPC=y
CONFIG_CGROUPS=y
CONFIG_CGROUP_DEBUG=y
CONFIG_CGROUP_FREEZER=y
CONFIG_CGROUP_CPUACCT=y
CONFIG_RESOURCE_COUNTERS=y
CONFIG_CGROUP_SCHED=y
CONFIG_RT_GROUP_SCHED=y
CONFIG_BLK_DEV_INITRD=y
CONFIG_EMBEDDED=y
CONFIG_NO_HZ=y
CONFIG_HIGH_RES_TIMERS=y
CONFIG_PREEMPT=y
CONFIG_PM_AUTOSLEEP=y
CONFIG_PM_WAKELOCKS=y
CONFIG_BLK_DEV_DM=y
CONFIG_DM_CRYPT=y
CONFIG_NET=y
CONFIG_PACKET=y
CONFIG_UNIX=y
CONFIG_XFRM_USER=y
CONFIG_NET_KEY=y
CONFIG_INET=y
CONFIG_IP_ADVANCED_ROUTER=y
CONFIG_IP_MULTIPLE_TABLES=y
CONFIG_INET_ESP=y
# CONFIG_INET_LRO is not set
CONFIG_IPV6_PRIVACY=y
CONFIG_IPV6_ROUTER_PREF=y
CONFIG_IPV6_OPTIMISTIC_DAD=y
CONFIG_INET6_AH=y
CONFIG_INET6_ESP=y
CONFIG_INET6_IPCOMP=y
CONFIG_IPV6_MIP6=y
CONFIG_IPV6_MULTIPLE_TABLES=y
CONFIG_NETFILTER=y
CONFIG_NF_CONNTRACK=y
CONFIG_NF_CONNTRACK_EVENTS=y
CONFIG_NF_CT_PROTO_DCCP=y
CONFIG_NF_CT_PROTO_SCTP=y
CONFIG_NF_CT_PROTO_UDPLITE=y
CONFIG_NF_CONNTRACK_AMANDA=y
CONFIG_NF_CONNTRACK_FTP=y
CONFIG_NF_CONNTRACK_H323=y
CONFIG_NF_CONNTRACK_IRC=y
CONFIG_NF_CONNTRACK_NETBIOS_NS=y
CONFIG_NF_CONNTRACK_PPTP=y
CONFIG_NF_CONNTRACK_SANE=y
CONFIG_NF_CONNTRACK_TFTP=y
CONFIG_NF_CT_NETLINK=y
CONFIG_NETFILTER_TPROXY=y
CONFIG_NETFILTER_XT_TARGET_CLASSIFY=y
CONFIG_NETFILTER_XT_TARGET_CONNMARK=y
CONFIG_NETFILTER_XT_TARGET_MARK=y
CONFIG_NETFILTER_XT_TARGET_NFLOG=y
CONFIG_NETFILTER_XT_TARGET_NFQUEUE=y
CONFIG_NETFILTER_XT_TARGET_TPROXY=y
CONFIG_NETFILTER_XT_TARGET_TRACE=y
CONFIG_NETFILTER_XT_MATCH_COMMENT=y
CONFIG_NETFILTER_XT_MATCH_CONNLIMIT=y
CONFIG_NETFILTER_XT_MATCH_CONNMARK=y
CONFIG_NETFILTER_XT_MATCH_CONNTRACK=y
CONFIG_NETFILTER_XT_MATCH_HASHLIMIT=y
CONFIG_NETFILTER_XT_MATCH_HELPER=y
CONFIG_NETFILTER_XT_MATCH_IPRANGE=y
CONFIG_NETFILTER_XT_MATCH_LENGTH=y
CONFIG_NETFILTER_XT_MATCH_LIMIT=y
CONFIG_NETFILTER_XT_MATCH_MAC=y
CONFIG_NETFILTER_XT_MATCH_MARK=y
CONFIG_NETFILTER_XT_MATCH_POLICY=y
CONFIG_NETFILTER_XT_MATCH_PKTTYPE=y
CONFIG_NETFILTER_XT_MATCH_QTAGUID=y
CONFIG_NETFILTER_XT_MATCH_QUOTA=y
CONFIG_NETFILTER_XT_MATCH_QUOTA2=y
CONFIG_NETFILTER_XT_MATCH_QUOTA2_LOG=y
CONFIG_NETFILTER_XT_MATCH_SOCKET=y
CONFIG_NETFILTER_XT_MATCH_STATE=y
CONFIG_NETFILTER_XT_MATCH_STATISTIC=y
CONFIG_NETFILTER_XT_MATCH_STRING=y
CONFIG_NETFILTER_XT_MATCH_TIME=y
CONFIG_NETFILTER_XT_MATCH_U32=y
CONFIG_NF_CONNTRACK_IPV4=y
CONFIG_IP_NF_IPTABLES=y
CONFIG_IP_NF_MATCH_AH=y
CONFIG_IP_NF_MATCH_ECN=y
CONFIG_IP_NF_MATCH_TTL=y
CONFIG_IP_NF_FILTER=y
CONFIG_IP_NF_TARGET_REJECT=y
CONFIG_IP_NF_TARGET_REJECT_SKERR=y
CONFIG_NF_NAT=y
CONFIG_IP_NF_TARGET_MASQUERADE=y
CONFIG_IP_NF_TARGET_NETMAP=y
CONFIG_IP_NF_TARGET_REDIRECT=y
CONFIG_IP_NF_MANGLE=y
CONFIG_IP_NF_RAW=y
CONFIG_IP_NF_ARPTABLES=y
CONFIG_IP_NF_ARPFILTER=y
CONFIG_IP_NF_ARP_MANGLE=y
CONFIG_NF_CONNTRACK_IPV6=y
CONFIG_IP6_NF_IPTABLES=y
CONFIG_IP6_NF_FILTER=y
CONFIG_IP6_NF_TARGET_REJECT=y
CONFIG_IP6_NF_TARGET_REJECT_SKERR=y
CONFIG_IP6_NF_MANGLE=y
CONFIG_IP6_NF_RAW=y
CONFIG_NET_SCHED=y
CONFIG_NET_SCH_HTB=y
CONFIG_NET_CLS_U32=y
CONFIG_NET_EMATCH=y
CONFIG_NET_EMATCH_U32=y
CONFIG_NET_CLS_ACT=y
CONFIG_NETDEVICES=y
CONFIG_TUN=y
CONFIG_PPP=y
CONFIG_PPP_BSDCOMP=y
CONFIG_PPP_DEFLATE=y
CONFIG_PPP_MPPE=y
CONFIG_PPPOLAC=y
CONFIG_PPPOPNS=y
CONFIG_FB=y
CONFIG_SYNC=y
CONFIG_USB_GADGET=y
CONFIG_USB_G_ANDROID=y
CONFIG_USB_OTG_WAKELOCK=y
CONFIG_SWITCH=y
CONFIG_RTC_CLASS=y
CONFIG_STAGING=y
CONFIG_ANDROID=y
CONFIG_ANDROID_BINDER_IPC=y
CONFIG_ASHMEM=y
CONFIG_ANDROID_LOGGER=y
CONFIG_ANDROID_LOW_MEMORY_KILLER=y
CONFIG_ANDROID_INTF_ALARM_DEV=y
</pre>

<h3>Recommended Configuration</h3>

<pre>
CONFIG_PANIC_TIMEOUT=5
CONFIG_KALLSYMS_ALL=y
CONFIG_PERF_EVENTS=y
CONFIG_COMPACTION=y
# CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS is not set
CONFIG_PM_WAKELOCKS_LIMIT=0
# CONFIG_PM_WAKELOCKS_GC is not set
CONFIG_PM_RUNTIME=y
CONFIG_PM_DEBUG=y
CONFIG_SUSPEND_TIME=y
CONFIG_BLK_DEV_LOOP=y
CONFIG_BLK_DEV_RAM=y
CONFIG_BLK_DEV_RAM_SIZE=8192
CONFIG_UID_STAT=y
CONFIG_MD=y
CONFIG_DM_UEVENT=y
CONFIG_INPUT_EVDEV=y
CONFIG_INPUT_KEYRESET=y
# CONFIG_INPUT_MOUSE is not set
CONFIG_INPUT_JOYSTICK=y
CONFIG_JOYSTICK_XPAD=y
CONFIG_JOYSTICK_XPAD_FF=y
CONFIG_JOYSTICK_XPAD_LEDS=y
CONFIG_INPUT_TABLET=y
CONFIG_TABLET_USB_ACECAD=y
CONFIG_TABLET_USB_AIPTEK=y
CONFIG_TABLET_USB_GTCO=y
CONFIG_TABLET_USB_HANWANG=y
CONFIG_TABLET_USB_KBTAB=y
CONFIG_TABLET_USB_WACOM=y
CONFIG_INPUT_MISC=y
CONFIG_INPUT_KEYCHORD=y
CONFIG_INPUT_UINPUT=y
CONFIG_INPUT_GPIO=y
# CONFIG_VT is not set
# CONFIG_LEGACY_PTYS is not set
CONFIG_POWER_SUPPLY=y
CONFIG_BATTERY_ANDROID=y
CONFIG_MEDIA_SUPPORT=y
CONFIG_BACKLIGHT_LCD_SUPPORT=y
CONFIG_SOUND=y
CONFIG_SND=y
CONFIG_UHID=y
CONFIG_USB_HIDDEV=y
CONFIG_HID_A4TECH=y
CONFIG_HID_ACRUX=y
CONFIG_HID_ACRUX_FF=y
CONFIG_HID_APPLE=y
CONFIG_HID_BELKIN=y
CONFIG_HID_CHERRY=y
CONFIG_HID_CHICONY=y
CONFIG_HID_PRODIKEYS=y
CONFIG_HID_CYPRESS=y
CONFIG_HID_DRAGONRISE=y
CONFIG_DRAGONRISE_FF=y
CONFIG_HID_EMS_FF=y
CONFIG_HID_ELECOM=y
CONFIG_HID_EZKEY=y
CONFIG_HID_HOLTEK=y
CONFIG_HID_KEYTOUCH=y
CONFIG_HID_KYE=y
CONFIG_HID_UCLOGIC=y
CONFIG_HID_WALTOP=y
CONFIG_HID_GYRATION=y
CONFIG_HID_TWINHAN=y
CONFIG_HID_KENSINGTON=y
CONFIG_HID_LCPOWER=y
CONFIG_HID_LOGITECH=y
CONFIG_LOGITECH_FF=y
CONFIG_LOGIRUMBLEPAD2_FF=y
CONFIG_LOGIG940_FF=y
CONFIG_HID_MAGICMOUSE=y
CONFIG_HID_MICROSOFT=y
CONFIG_HID_MONTEREY=y
CONFIG_HID_MULTITOUCH=y
CONFIG_HID_NTRIG=y
CONFIG_HID_ORTEK=y
CONFIG_HID_PANTHERLORD=y
CONFIG_PANTHERLORD_FF=y
CONFIG_HID_PETALYNX=y
CONFIG_HID_PICOLCD=y
CONFIG_HID_PRIMAX=y
CONFIG_HID_ROCCAT=y
CONFIG_HID_SAITEK=y
CONFIG_HID_SAMSUNG=y
CONFIG_HID_SONY=y
CONFIG_HID_SPEEDLINK=y
CONFIG_HID_SUNPLUS=y
CONFIG_HID_GREENASIA=y
CONFIG_GREENASIA_FF=y
CONFIG_HID_SMARTJOYPLUS=y
CONFIG_SMARTJOYPLUS_FF=y
CONFIG_HID_TIVO=y
CONFIG_HID_TOPSEED=y
CONFIG_HID_THRUSTMASTER=y
CONFIG_HID_WACOM=y
CONFIG_HID_WIIMOTE=y
CONFIG_HID_ZEROPLUS=y
CONFIG_HID_ZYDACRON=y
CONFIG_USB_USBNET=y
CONFIG_USB_ANNOUNCE_NEW_DEVICES=y
CONFIG_USB_EHCI_HCD=y
CONFIG_ION=y
CONFIG_ANDROID_RAM_CONSOLE=y
CONFIG_ANDROID_TIMED_GPIO=y
CONFIG_EXT4_FS=y
CONFIG_EXT4_FS_SECURITY=y
CONFIG_FUSE_FS=y
CONFIG_MSDOS_FS=y
CONFIG_VFAT_FS=y
CONFIG_TMPFS=y
CONFIG_TMPFS_POSIX_ACL=y
CONFIG_SCHEDSTATS=y
CONFIG_TIMER_STATS=y
CONFIG_SCHED_TRACER=y
</pre>