xperia-e1-kernel-patches: A repository from mpersano

customizing the Xperia E1 kernel

building the kernel

This is the easy part.

Download the source tarball from Sony's site. I used this one.

Download a prebuilt toolchain:

git clone --depth=1 https://android.googlesource.com/platform/prebuilts/gcc/linux-x86/arm/arm-eabi-4.7/

Build the kernel image and the dtb:

cd kernel
mkdir ../out
make ARCH=arm CROSS_COMPILE=/path/to/arm-eabi-4.7/bin/arm-eabi- O=../out msm8610_build_defconfig zImage msm8610-v2-mtp.dtb -j2

building the boot image

Get mkqcdtbootimg:

git clone --depth=1 https://github.com/sonyxperiadev/mkqcdtbootimg
cd mkqcdtbootimg
make

Build the boot image:

./mkqcdtbootimg \
    --kernel /path/to/arch/arm/boot/zImage \
    --ramdisk /path/to/ramdisk.gz \
    --dt_dir /path/to/arch/arm/boot/ \
    --base 0x00000000 \
    --ramdisk_offset 0x2008000 \
    --kernel_offset 0x10000 \
    --tags_offset 0x1e08000 \
    --pagesize 2048 \
    --cmdline "androidboot.hardware=qcom user_debug=31 maxcpus=2 msm_rtb.filter=0x3F ehci-hcd.park=3 msm_rtb.enable=0 lpj=192598 dwc3.maximum_speed=high dwc3_msm.prop_chg_detect=Y" \
    -o boot.img

Flash it on the phone with fastboot.

getting ramdisk.gz

If you had root on your phone I suppose you get an image of the boot partition with something like...

dd if=/dev/block/platform/msm_sdcc.1/by-name/boot of=/sdcard/boot.img

... and then extract the ramdisk with this tool.

If you don't have root, you may have to use a certain closed-source application (written in C#) that will get a bunch of files from Sony's servers; one of those files will be a gzipped zip file (yes really), containing another file with a name like kernel-BLAH-BLAH.sin; then you'd use another closed-source application (this time written in Java) that will extract the ramdisk and qcdt images from this file.

rooting the phone

TODO

getting wi-fi to work

Ok, this took me a while to figure out...

You don't get wifi because the module wlan.ko is not compatible with the kernel you just compiled. You need to build a new one.

Get the source:

git clone --depth=1 https://github.com/sonyxperiadev/prima

The module needs a dummy parameter qcom_reg (more on this later). Edit CORE/HDD/src/wlan_hdd_main.c and add the following to the bottom:
```
static int qcom_reg = 0;
module_param(qcom_reg, int, 0644);
```

Build the module:

cd prima
make ARCH=arm CROSS_COMPILE=/path/to/arm-eabi-4.7/bin/arm-eabi- -C /path/to/kernel/out M=$PWD CONFIG_PRONTO_WLAN=m CONFIG_PRIMA_WLAN_LFR=y KERNEL_BUILD=1 WLAN_ROOT=$PWD -j2

Copy wlan.ko to /system/lib/modules/pronto/pronto_wlan.ko on the phone.
Copy the following files from prima/firmware_bin to the phone:
- WCNSS_cfg.dat to /system/etc/firmware/wlan/prima/
- WCNSS_qcom_cfg.ini to /data/misc/wifi/
- WCNSS_qcom_wlan_nv.bin to /data/misc/wifi/