Hello

I would like some information about porting to  a new product. I am mainly 
interested in understanding the preferred directory layout
to perform modifications to the system

If I take http://www.kandroid.org/android_pdk/build_system.html as source 
there are 3 Layers

Product (The product layer defines a complete specification of a shipping 
product)
Device (The device layer represents the physical layer of plastic on the 
device)
Board (The board layer represents the bare schematics of a product)
Arch (e.g. armv7)

http://source.android.com/porting/build_new_device.html suggest
creating a directory called "vendor" but if I look a the android platform 
source code changes are found in a directory called "device" for example 
device/htc. Again 
if I look at the code for the emulator and such product definitions are 
found under the build system (e.g. build/target/product). In terms of 
porting to certain hardware I inf also found the "hardware" directory.

so for short can somebody tell me what is the role/idea is behind
build/target/product
vendor/example/product
device/example/product
and hardware/ ?

Greetings

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