From f6fa41588c6c7664b265da7ad4e27de1e2ae0880 Mon Sep 17 00:00:00 2001 From: Gabriel Jacobo Date: Sat, 12 Oct 2013 11:35:47 -0300 Subject: [PATCH] Updates the Raspberry Pi README --- README-raspberrypi.txt | 63 ++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 61 insertions(+), 2 deletions(-) diff --git a/README-raspberrypi.txt b/README-raspberrypi.txt index b0f0b25b234e0..aa19511c226fb 100644 --- a/README-raspberrypi.txt +++ b/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: -wheezy-raspbian.img +Let's assume the sysroot will be built in /opt/rpi-sysroot. + + export SYSROOT=/opt/rpi-sysroot + sudo kpartx -a -v .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 + 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 +