Steps for begginer (Porting Tutorial)

[Jaimin Ajmeri]

Hi People,

I would like to learn porting android os to allwinner a20 processor. I want to learn the process involved in porting android os to a new board. Please guide through the process.

Thanks,
Jaimin

[Raul Piper]

Hi Jaimin,

Is your allwinner a20 processor listed under the list of Processors(Soc) mentioned in the list of AOSP(android Open Source kernel) kernels here : (under Figuring out which kernel to build : ) 

-> http://source.android.com/source/building-kernels.html#figuring-out-which-kernel-to-build

Device	Binary location	Source location	Build configuration
shamu	device/moto/shamu-kernel	kernel/msm	shamu_defconfig
fugu	device/asus/fugu-kernel	kernel/x86_64	fugu_defconfig
volantis	device/htc/flounder-kernel	kernel/tegra	flounder_defconfig
hammerhead	device/lge/hammerhead-kernel	kernel/msm	hammerhead_defconfig
flo	device/asus/flo-kernel/kernel	kernel/msm	flo_defconfig
deb	device/asus/flo-kernel/kernel	kernel/msm	flo_defconfig
manta	device/samsung/manta/kernel	kernel/exynos	manta_defconfig
mako	device/lge/mako-kernel/kernel	kernel/msm	mako_defconfig
grouper	device/asus/grouper/kernel	kernel/tegra	tegra3_android_defconfig
tilapia	device/asus/grouper/kernel	kernel/tegra	tegra3_android_defconfig
maguro	device/samsung/tuna/kernel	kernel/omap	tuna_defconfig
toro	device/samsung/tuna/kernel	kernel/omap	tuna_defconfig
panda	device/ti/panda/kernel	kernel/omap	panda_defconfig
stingray	device/moto/wingray/kernel	kernel/tegra	stingray_defconfig
wingray	device/moto/wingray/kernel	kernel/tegra	stingray_defconfig
crespo	device/samsung/crespo/kernel	kernel/samsung	herring_defconfig
crespo4g	device/samsung/crespo/kernel	kernel/samsung	herring_defconfig

If it is there it is fairly easy to start the porting process : 

As a summary these will be the steps : 

1.Download the Android source (start with Kitkat : 4.4.4 ) and build it , follow : http://source.android.com/source/building-running.html

2.Download the kernel source for your board and build it. follow : http://source.android.com/source/building-kernels.html

3.Link the zImage of the kernel built in #2 at arch/<processor-type>/boot/zImage (use ln -s <location of zImage> kernel)

4.Build the Android as whole or build the bootimage - make bootimage 

5.Now in the device/<manufacture>/<device-name>/ there must be a README to flash the board you have using fastboot.

6.Using #5 Use the images formed in the  out/target/product/<your device name> - system.img ,boot.img and userdata.img as  formed after #4 (for all images ) to flash your board.

7.Connect your Board with the HDMI cable to a Display screen and connect it using USB cable for USB adb debugging.

You can connect the minicom to get the output while your board boots(kernel) up by connecting RS232-to-USB cable with your board .

If you find any issue post the logs here .

This link has all the information you need : http://source.android.com/source/building-kernels.html#figuring-out-which-kernel-to-build

and follow below points sequentially : 

• Overview
• Downloading and Building
  • Initializing the Build Environment
  • Downloading the Source
  • Building and Running
  • Building for Devices
  • Building Kernels

Have a good luck exploring your board with the Android.

Rgds,

Rp

--
--
unsubscribe: android-porti...@googlegroups.com
website: http://groups.google.com/group/android-porting

---
You received this message because you are subscribed to the Google Groups "android-porting" group.
To unsubscribe from this group and stop receiving emails from it, send an email to android-porti...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

[Anthony Chiesa]

[Brian Yee]

Hi Raul,

So if I wanted to build for the Samsung Galaxy Tab S2 9.7, which has the Exynos 5433 CPU I could use the 'kernel/exynos' option listed in the table?  Thus I can build the vanilla AOSP and put it on the tablet?  How would I get things like the drivers for the video card, camera and other hardware in the build?

I believe  cyanogenmod has a build, but I want to learn how to do it myself so I can play around with the AOSP, make changes and put it on the tablet.

If not how would I go about doing this with the Samsung tablet i have referenced?  Buying a Nexus 9 is out of the questions right now.

Thanks for any help!

-Brian

[Glenn Kasten]

I recommend this site also:

  https://source.android.com/devices/index.html

The "interfaces" section describe the major Hardware Abstraction Layer (HAL)

interfaces that you will need to implement when you port to a new device.

[Brian Yee]

So basically I would need to write my own drivers for video and whatnot to get everything working?  

[Zeeshan Khan]

No. You might be able to find the driver source code that you need from other devices, just need to search them up. You can find these drivers in the current Rom installed on your device under /system/lib/hw.

[Raul Piper]

reposting....

---------- Forwarded message ----------
From: Raul Piper <raulpb...@gmail.com>
Date: Sun, Sep 6, 2015 at 10:00 PM
Subject: Re: [android-porting] Steps for begginer (Porting Tutorial)
To: bri...@gmail.com

So if I wanted to build for the Samsung Galaxy Tab S2 9.7, which has the Exynos 5433 CPU I could use the 'kernel/exynos' option listed in the table?  

>> Correct 

Thus I can build the vanilla AOSP and put it on the tablet?

>> Yes .But be sure it can brick your tab as well.No warranty/Guarantee applied for this.

 How would I get things like the drivers for the video card, camera and other hardware in the build?

>>you should look for the sources for the Tab first on : http://opensource.samsung.com/reception.do

I believe  cyanogenmod has a build, but I want to learn how to do it myself so I can play around with the AOSP, make changes and put it on the tablet.

>>No idea about cyanogenmod  for Samsung Tablet.Sorry for this.

If not how would I go about doing this with the Samsung tablet i have referenced?  Buying a Nexus 9 is out of the questions right now.

>>Why Nexus 9 is out of of the Question.Samsung you know not that much open .Isnt it?

Thanks for any help!

[Raul Piper]

Here is the link for the Kernel for Samsung Galaxy Tab 2 : 

http://opensource.samsung.com/reception/receptionSub.do?method=sub&sub=F&searchValue=gt-p3113

Model name s GT-P3113