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Device configuration for LGE L3

Basic	Spec Sheet
CPU	Single-core 800 MHz
CHIPSET	Qualcomm MSM7225a Snapdragon S1
GPU	Adreno 200
Memory	384Mb RAM
Shipped Android Version	2.3.6
Storage	1GB
MicroSD	Up to 64GB
Battery	1500 mAh
Dimensions	102.6 x 61.6 x 11.9 mm
Display	320 x 240 pixels
Camera	3.15 MP, 2048 x 1536 pixels
Release Date	January 2012

CM10.1 (Android 4.2.2) on the 3.4 kernel

This branch builds CM10.1 for the E400 on top of the Qualcomm 3.4 kernel (chijure-android-system-development/lge-kernel-lproj, branch android-msm-3.4-jb4.2-e0). kernel is the prebuilt zImage of that tree.

Local manifest entry for the extra project (.repo/local_manifests/e400.xml):

<remote name="chijure" fetch="https://github.com/chijure-android-system-development" />
<project path="packages/apps/OtgSwitch" name="android_packages_apps_OtgSwitch"
         remote="chijure" revision="jellybean" />

Build: lunch cm_e400-userdebug && make -j8 otapackage.

What works

Boot, WiFi, Bluetooth, speaker/headset audio, GPS HAL, sensors, zram (80 MB, prebuilt/30zram), USB mass storage screen laid out for 240x320, stock LG charging animation, USB OTG host (see below).

Charger mode

The bootloader boots with lge.reboot=pwroff after a forced power-off. init runs /sbin/chargerwrap, which starts the stock LG chargerlogo (images from CM7, in chargemode/) only after a clean shutdown (/data/misc/clean_poweroff, written on sys.shutdown.requested=0, removed once boot completes) and only with a charger present. After a spurious reset it just reboots into Android.

USB OTG host

The micro-USB ID pin is not seen by the SoC (OTGSC ID bit stays 1 with two different OTG adapters) and the VBUS enable GPIO (141) cannot be requested, so:

• host mode is forced through debugfs: setprop sys.otg.mode host (or the OtgSwitch app, packages/apps/OtgSwitch); peripheral restores adb/charging over USB. init.e0.rc mounts debugfs and maps the property to /sys/kernel/debug/otg/mode.
• the phone does not power the attached device: use an OTG cable with external 5 V.
• the kernel needs CONFIG_USB_STORAGE=y. vold.fstab mounts the drive at /storage/usbdisk (/devices/platform/msm_hsusb_host.0) and storage_list.xml lists it in Settings. Mouse (HID) tested, keyboard not.
• host mode disables VBUS/ID detection, so it resets on reboot.

Known issues

• With the 3.4 kernel the phone resets silently about 610 s after boot (the 2.6.38 kernel with the same ramdisk does not). Not caused by charger, idle, modem, userspace or the LGE/MSM config options tried; see the investigation notes in the kernel work tree.
• Camera preview works for ~10 s (gralloc private_handle_t ABI, 3 fds).
• A2DP, proximity sensor, FM and telephony (SIM-locked test phone) pending.