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Updates the Raspberry Pi README

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gabomdq committed Oct 12, 2013
1 parent 9a0954c commit f6fa41588c6c7664b265da7ad4e27de1e2ae0880
Showing with 61 additions and 2 deletions.
  1. +61 −2 README-raspberrypi.txt
@@ -27,6 +27,65 @@ OpenGL ES 2.x, it usually comes pre installed, but in any case:

sudo apt-get install libraspberrypi0 libraspberrypi-bin libraspberrypi-dev

================================================================================
Cross compiling from x86 Linux
================================================================================

To cross compile SDL for Raspbian from your desktop machine, you'll need a
Raspbian system root and the cross compilation tools. We'll assume these tools
will be placed in /opt/rpi-tools

sudo git clone --depth 1 https://github.com/raspberrypi/tools /opt/rpi-tools

You'll also need a Rasbian binary image.
Get it from: http://downloads.raspberrypi.org/raspbian_latest
After unzipping, you'll get file with a name like: <date>-wheezy-raspbian.img
Let's assume the sysroot will be built in /opt/rpi-sysroot.

export SYSROOT=/opt/rpi-sysroot
sudo kpartx -a -v <path_to_raspbian_image>.img
sudo mount -o loop /dev/mapper/loop0p2 /mnt
sudo cp -r /mnt $SYSROOT
sudo apt-get install qemu binfmt-support qemu-user-static
sudo cp /usr/bin/qemu-arm-static $SYSROOT/usr/bin
sudo mount --bind /dev $SYSROOT/dev
sudo mount --bind /proc $SYSROOT/proc
sudo mount --bind /sys $SYSROOT/sys

Now, before chrooting into the ARM sysroot, you'll need to apply a workaround,
edit $SYSROOT/etc/ld.so.preload and comment out all lines in it.

sudo chroot $SYSROOT
apt-get install libudev-dev libasound2-dev libdbus-1-dev libraspberrypi0 libraspberrypi-bin libraspberrypi-dev libx11-dev libxext-dev libxrandr-dev libxcursor-dev libxi-dev libxinerama-dev libxxf86vm-dev libxss-dev
exit
sudo umount $SYSROOT/dev
sudo umount $SYSROOT/proc
sudo umount $SYSROOT/sys
sudo umount /mnt

The final step is compiling SDL itself.

export CC="/opt/rpi-tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin/arm-linux-gnueabihf-gcc --sysroot=$SYSROOT -I$SYSROOT/opt/vc/include -I$SYSROOT/usr/include -I$SYSROOT/opt/vc/include/interface/vcos/pthreads -I$SYSROOT/opt/vc/include/interface/vmcs_host/linux"
cd <SDL SOURCE>
mkdir -p build;cd build
../configure --with-sysroot=$SYSROOT --host=arm-raspberry-linux-gnueabihf --prefix=$PWD/rpi-sdl2-installed --disable-pulseaudio --disable-esd

================================================================================
Apps don't work or poor video/audio performance
================================================================================

If you get sound problems, buffer underruns, etc, run "sudo rpi-update" to
update the RPi's firmware. Note that doing so will fix these problems, but it
will also render the CMA - Dynamic Memory Split functionality useless.

Also, by default the Raspbian distro configures the GPU RAM at 64MB, this is too
low in general, specially if a 1080p TV is hooked up.

See here how to configure this setting: http://elinux.org/RPiconfig

Using a fixed gpu_mem=128 is the best option (specially if you updated the
firmware, using CMA probably won't work, at least it's the current case).

================================================================================
No input
================================================================================
@@ -83,5 +142,5 @@ this determining the CAPS LOCK behavior:
Notes
================================================================================

* Building has only been tested natively (i.e. not cross compiled). Cross
compilation might work though, feedback is welcome!
* Input events from the keyboard leak through to the console

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