The steps are based on this guide. Finally install the agent for auto-start with the following steps. And set it up for auto-start. You can also download a basic root filesystem with libgpiod installed from here. Set up a sysroot folder on the local host machine. Then perform the following steps. Store the result of pwd , it is going to be used by rsync later.
Now use rsync to clone the BBB sysroot to the local host machine. On Linux, it is recommended to repair some symlinks which can be problematic: Navigate to the folder containing the symlinks first:. This location needs to be converted into a relative path. Run the following command to create a relative symlinks instead of an absolute ones. The pointed to location might change to check it with readlink first before removing the symlinks:.
For more information on issues which can occur when cloning the root filesystem, see the troubleshooting section. This requires MSYS2 installed. It is recommended to set up aliases in the. Please note that rsync sometimes does not copy shared libraries or symlinks properly, which might result in errors when cross-compiling and cross-linking. This is not necessary to build newlib or gcc itself on OS X. This process will start by downloading about MiB of upstream sources, then will patch, build, and install the toolchain.
Your computer will need about 8 GiB of disk space to complete the process. To build the Newlib cross-compiler, pick an install path. Then, simply run the following command:. To build the Linux cross-compiler, pick an install path. The build defaults to targetting RV64GC bit , even on a bit build environment. To build the bit RV32GC toolchain, use:.
Supported architectures are rv32i or rv64i plus standard extensions a tomics, m ultiplication and division, f loat, d ouble, or g eneral for MAFD. Supported ABIs are ilp32 bit soft-float , ilp32d bit hard-float , ilp32f bit with single-precision in registers and double in memory, niche use only , lp64 lp64f lp64d same but with bit long and pointers.
To build either cross-compiler with support for both bit and bit, run the following command:. And then either make or make linux for the Newlib or Linux cross-compiler respectively. The multilib compiler will have the prefix riscvunknown-elf- or riscvunknown-linux-gnu-, but will be able to target both bit and bit systems.
Builds work best if installing into an empty directory. If you build a hard-float toolchain and then try to build a soft-float toolchain with the same --prefix directory, then the build scripts may get confused and exit with a linker error complaining that hard float code can't be linked with soft float code.
Removing the existing toolchain first, or using a different prefix for the second build, avoids the problem. It is OK to build one newlib and one linux toolchain with the same prefix.
But you should avoid building two newlib or two linux toolchains with the same prefix. If building a linux toolchain on a MacOS system, or on a Windows system using the Linux subsystem or cygwin, you must ensure that the filesystem is case-sensitive. There is an alternate toolset provided that includes current versions of the GNU tools. This is the devtoolset provided as part of the Software Collection service.
For more info, see the devtoolset-7 URL. There are various versions of the devtoolset that are available, so you can also try other versions of it, but we have at least one report that devtoolset-7 works. There are a number of additional options that may be passed to configure. See '. The argument is a semicolon separated list of values, possibly consisting of a single value. The accepted values and meanings are given below. Every config is constructed with four components: architecture string, ABI, reuse rule with architecture string and reuse rule with sub-extension.
Example 3: Add multi-lib support for rv32i with ilp32; rv32im with ilp32 and rv32ic with ilp32 will reuse this multi-lib set. Example 4: Add multi-lib support for rv64ima with lp64; rv64imaf with lp64, rv64imac with lp64 and rv64imafc with lp64 will reuse this multi-lib set.
To enter Scratchbox type sb2. You should see your prompt change to the target we just created. Note: On some systems there if you run into a problem running the binary with an error stating that mmap is causing a problem, here is a simple fix. This section will cover how to install libraries to further your development.
This is dependent on your target and host distros so if you are running Debian and Debian…follow me. Since we are building a Debian based system our target contains apt-get. Turns out there is a tool for cross compiled libraries call apt-cross. We want to setup our system to keep our host libraries separate from our cross system. The arguments for this command define the architecture -a , the version of Debian -S and the mirror -m and tells apt-cross to update -u.
Next we will install a development package. Dependencies will be installed including libc and gcc-base. Great things these package managers. We are using shared libraries installed outside of Scratchbox so we need to tell the system where everything is located.
When running the file we update our library path to include the cross-pkg libs. You are now ready to write code…and cross compile it. Build Cross Compiler The basis of all cross compiler environments is the cross compiler itself. Required Packages The following is a list of the obvious packages to build a cross compiler.
Download The next step is to download and install crosstool-NG. Build Cross Compiler The last step is to build the cross compiler. Cross Compiler Jail Now that we have our cross compilers build we need to create an environment to use these tools while attempting to ease the process of building software. We will be using [Scratchbox2][3] and [QEmu][4] to emulate our target architecture. Directory Structure The first step to building the jail is to setup the directory structure of our jailing system.
Now we are ready to setup our jail.
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