Difference between revisions of "WebOS Internals PDK"

Revision as of 14:58, 14 January 2010

Palm's binary sdk the "Plugin Developer Kit" will not be available until March 2010.

In the mean time, WebOS Internals has released a full "PDK" for you using Scratchbox2.

We strongly urge the community to standardize on this PDK until Palm releases theirs. We believe that it uses the same underlying technologies, and that it will give you both a means to port games now, and a head-start to development against the official Palm PDK in the future.

Scratchbox 2 is a cross-compilation engine, it can be used to create a highly flexible SDK.

As installed below, the install process uses a script which extracts the required Palm provided files from a copy of webos doctor, and downloads from other sources, and builds a complete compilation environment automatically which can compile SDL and openGLES apps for webOS.

SB2 itself is totally distribution neutral but the webOS cross-compile environment is designed and tested on Ubuntu 9.10 32 bit. (At least one user in #webos-internals reports complete success running the cross compile environment in Ubuntu 9.10 64 bit after installing curl via apt-get.)

The webOS Internals team strongly suggest apt-get install into that environment only for this purpose. The same installation of Sun Virtualbox which hosts the Palm SDK emulator can host an Ubuntu 9.10 server with very little effort.

SB2 Homepage

http://www.freedesktop.org/wiki/Software/sbox2pdk

License

Scratchbox 2 is distributed under LGPL version 2.1, portions are under GPL version 2. Some minor stuff is under MIT style license.

Installation on Ubuntu for WebOS PDK cross compiling

VirtualBox tips for Windows users

If you are running your Ubuntu server in a VirtualBox client on a Windows desktop host, there are a few tricks you should know.

If you run the various commands below from the ubuntu console in VirtualBox, you can not cut and paste into and out of the console. It is to your benefit then, to use PUTTY to control the VirtualBox console instead of running in it directly.

To reach your VirtualBox Ubuntu with Putty, you will need to do some set up steps.

From the ubuntu server console apt-get install openSSH-server
shut down the ubuntu server
In the VirtualBox manager, choose your ubuntu server and pick setup.
In setup choose the network adaptor 1, and change it's type from NAT to bridged.

Now, restart your ubuntu server and log into it from the regular console. At prompt after logging in, type ifconfig eth0 . The server will reply with the ip address of the virtualbox server.

Now, go to putty, and create a new login to your ubuntu server with that IP address, type ssh port 22.

Now, you can log into your server, and cut and paste commands and output, you can scroll back and see things that have scrolled off the screen etc. etc.

This is strongly advised.

Prequisites

Your Ubuntu installation will need the following installed. If you do not have them, run the command after the package name. You can test if they are found by just typing the command name. If it says command not found, you need to install it.

git apt-get install git-core
gcc apt-get install build-essential
curl apt-get install curl
unzip apt-get install unzip

If you're uncertain at all, just cut and paste the following. If they are already isntalled, they'll be skipped.

 apt-get install git-core build-essential curl unzip

Note: The make toolchain command and later steps will download approximately a half-gig of tools and sources from various locations. Do not start this if you do not have time for a large download. Additionally, if you already have downloaded a copy of the WebOS 1.3.5 doctor, you can reduce the download time by copying the doctor file into cross-compile/doctors/webosdoctorp100ewwsprint-1.3.5.jar . This will cause the appropriate command to skip that download. Note that codesourcery rate limts downloads and at a minimum this process will take 10 to 15 minutes irrespective of your connection speed.

Start setup

Create a preware folder, copy the cross-compile tools into it (if you have not installed git, apt-get install git-core), and use a make script to begin the set up of the compilation toolchain.

sudo mkdir -p /srv/preware
cd /srv/preware
sudo chmod 777 .
git clone git://git.webos-internals.org/preware/cross-compile.git
cd cross-compile
make toolchain

Fix mmap errors

The following commands appear redundant. They are not. The install this fixes your mmap config to fix an mmap: permission denied error, but we don't need the package itself.

sudo apt-get install qemu-arm-static
sudo apt-get remove qemu-arm-static

OR As a workaround, if this package is not available,

the following commands can be executed in a root shell (sudo -s) to fix the mmap configuration to enable qemu-arm to work.

echo "vm.mmap_min_addr = 4096" > /etc/sysctl.d/mmap_min_addr.conf
/etc/init.d/procps restart

(note that the value should not be "0". 4096 is chosen to avoid null pointer attacks.)

Setup Scratchbox

Now, use apt-get to setup scratchbox...

sudo apt-get install scratchbox2 qemu-kvm-extras

...and set it up for compiling for webOS.

cd /srv/preware/cross-compile/toolchain/arm-2007q3/arm-none-linux-gnueabi/libc
PATH=/srv/preware/cross-compile/toolchain/arm-2007q3/bin:${PATH} sb2-init -c /usr/bin/qemu-arm armv7 arm-none-linux-gnueabi-gcc
cd /srv/preware/cross-compile

If you are using a stock Ubuntu 9.10 install the following packets might be missing:

sudo apt-get install autoconf subversion

Then:

make stage

Once this setup is complete, compiling sdl apps for webOS is very simple.

Sample build of Application:Doom

Now, go to Building DOOM with scratchbox2 and follow the simple directions.