SDK for the Valve Steam Link
This is the SDK for the Valve Steam Link
The Steam Link hardware is a single core ARMv7 processor using the hard-float ABI,
1 GHz, with neon instruction support. It has approximately
256 MB of available
1 GB of usable flash storage.
The Steam Link software is custom Linux firmware based on
kernel 3.8 and
The Steam Link SDK has support for the following major APIs:
OpenGL ES 2.0
The SDL game controller API is recommended for Steam Controller support on the Steam Link.
Examples to demonstrate how to build applications using the SDK. Each application directory has a
build_steamlink.sh script to build and package the example.
Native app icons should be 116x116, and will be scaled to that size if needed.
Source code to 3rd party components of the Steam Link, each directory has a
build_steamlink.sh script to rebuild the component.
Steam Link linux kernel source code
Steam Link root filesystem
Debug symbols for binaries in the latest build are available from: http://media.steampowered.com/steamlink/steamlink-sdk-symbols.tar.xz
GCC toolchain for Steam Link
Script to configure build environment
Steam Link applications are built using this SDK on Linux.
To set up the build environment, source the top level
# source setenv.sh
This is done inside the build script for each example, as needed.
Put the files in a folder with the app name on a FAT32 USB drive under
\steamlink\apps, insert it into the Steam Link and power cycle the device.
The app will be copied onto the system at boot and can be launched from the menu.
You may need to enable ssh access to the Steam Link for advanced debugging.
You can do this by putting a file called
enable_ssh.txt on a FAT32 USB drive under
\steamlink\config\system, inserting it into the Steam Link and power cycle the device.
The root password is
steamlink123 and should be changed using the
passwd command the first time you log in.
SSH access will remain enabled until a factory reset.
Recommended way is to run
gdbserver on the Steam Link and use a local
gdb to connect to it and debug an application.
First, configure environment for SDK:
# source setenv.sh
Second, make sure that the install path of the SDK is on gdb's
# echo "add-auto-load-safe-path $MARVELL_SDK_PATH" >> ~/.gdbinit
Build an example application and transfer it into the steam link:
# cd examples/linux # make # scp example firstname.lastname@example.org:/mnt/scratch
On the steam link, run the application:
# gdbserver :8080 example
Or you can attach to a running process with:
# gdbserver --attach :8080 $(pidof example)
On the host, create a
.gdbinit file for your application and target:
$ ../../scripts/create_gdbinit.sh example 10.1.211.126:8080
On the host, run
gdb and attach to the gdbserver:
ubuntu:/valve/marvell/sdk/examples/linux $ armv7a-cros-linux-gnueabi-gdb GNU gdb (Gentoo 7.7.1 p1 e02ddb0f2eea465662e99fee14e9c41f23769624) 22.214.171.12440425-cvs Copyright (C) 2014 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "--host=x86_64-pc-linux-gnu --target=armv7a-cros-linux-gnueabi". Type "show configuration" for configuration details. For bug reporting instructions, please see: <http://bugs.gentoo.org/>. Find the GDB manual and other documentation resources online at: <http://www.gnu.org/software/gdb/documentation/>. For help, type "help". Type "apropos word" to search for commands related to "word". 0xb6f6ba00 in _start () from /valve/marvell/sdk/rootfs/lib/ld-linux-armhf.so.3 (gdb) break printf Function "printf" not defined. Make breakpoint pending on future shared library load? (y or [n]) y Breakpoint 1 (printf) pending. (gdb) c Continuing. Breakpoint 1, __printf (format=0xb6f8c764 "Hello world!\n") at printf.c:28 28 printf.c: No such file or directory. (gdb) where #0 __printf (format=0xb6f8c764 "Hello world!\n") at printf.c:28 #1 0xb6f8c704 in main (argc=1, argv=0xbed64e64) at example.c:7
Building the kernel
Follow these steps in addition to setting up the build environment as described above.
WARNING: Steam Link devices will only boot with a kernel signed by Valve. If you attempt to replace the kernel with an unsigned binary you will void your warranty and render your Steam Link unbootable.
Set environment variables for kernel build
# export ARCH=arm; export LOCALVERSION="-mrvl"
Configure kernel for Steam Link target
# make bg2cd_penguin_mlc_defconfig
Customize kernel configuration (optional)
# make menuconfig
Build modules (optional)
# make modules