The cross_arch and cross_compile links method is obsolete and not available any more, so we remove it from the documentation. Signed-off-by: Robert Schwebel <r.schwebel@pengutronix.de>
61 lines
1.7 KiB
Text
61 lines
1.7 KiB
Text
/** @page building Building
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<i>This section describes how to build the Barebox bootloader.</i>
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@a Barebox uses Kconfig/Kbuild from the Linux kernel to build it's
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sources. It consists of two parts: the makefile infrastructure (kbuild)
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and a configuration system (kconfig). So building @a barebox is very
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similar to building the Linux kernel.
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In the examples below we use the "sandbox" configuration, which is a
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port of @a Barebox to the Linux userspace. This makes it possible to
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test the code without having real hardware or even qemu. Note that the
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sandbox architecture does only work well on x86 and has some issues on
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x86_64.
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\todo Find out about issues on x86_64.
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Selecting the architecture and the corresponding cross compiler is done
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by setting the following environment variables:
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- ARCH=\<architecture>
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- CROSS_COMPILE=\<compiler-prefix>
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For @p ARCH=sandbox we do not need a cross compiler, so it is sufficient
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to specify the architecture:
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@code
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# export ARCH=sandbox
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@endcode
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In order to configure the various aspects of @a barebox, start the
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@a barebox configuration system:
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@code
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# make menuconfig
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@endcode
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This command starts a menu box and lets you select all the different
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options available for the selected architecture. Once the configuration
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is finished (you can simulate this by using the default config file with
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'make sandbox_defconfig'), there is a .config file in the toplevel
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directory of the sourcecode.
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After @a barebox is configured, we can start the compilation:
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@code
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# make
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@endcode
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You can use '-j \<n\>' in order to do a parallel build if you have more
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than one cpus.
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If everything goes well, the result is a file called @p barebox:
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@code
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# ls -l barebox
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-rwxr-xr-x 1 rsc ptx 114073 Jun 26 22:34 barebox
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@endcode
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*/
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