Step 3 : Compile Bare-Linux
============================

.. tab-set::

   .. tab-item:: Compile Bare-Linux

        * In this program, you are going to learn


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                * How to ?


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        Topics in this section,

                * :ref:`Source code download and compilation <barelinux_rpi_3b_step5_0>`


.. _barelinux_rpi_3b_step5_0:

.. tab-set::

   .. tab-item:: Source code download and compilation

        * Make sure current dir is $HOME
        
        .. code-block:: c

                $ cd $HOME

        * Use below command to download the source code.

        .. code-block:: c

                $ git clone git://git.buildroot.net/buildroot
                
        * Change the current directory to build as mentioned below. 

        .. code-block:: c

                $ cd buildroot

        * Now, list out the content of "board" directory to check if the bare-linux source code supports our required target.

        .. code-block:: c

                test:board$ ls
                aarch64-efi  armadeus  beagleboardx15   bsh         firefly      intel          mender       olpc        qemu           raspberrypi3-64      seeed               synopsys     uevm5432     zynqmp
                acmesystems  arrow     beaglebone       canaan      freescale    khadas         microchip    openblocks  radxa          raspberrypi4         sheevaplug          technexion   versal
                altera       aspeed    beagleboneai     chromebook  friendlyarm  kontron        minnowboard  orangepi    raspberrypi    raspberrypi4-64      sifive              technologic  visionfive
                amarula      asus      beaglev          ci20        globalscale  lego           nexbox       pandaboard  raspberrypi0   raspberrypicm4io     sipeed              terasic      visionfive2
                andes        atmel     beelink          cubietech   grinn        lemaker        nezha        pc          raspberrypi0w  raspberrypicm4io-64  solidrun            ti           wandboard
                arcturus     avnet     boundarydevices  embest      hardkernel   librecomputer  octavo       pcengines   raspberrypi2   raspberrypizero2w    spike               toradex      warp7
                arm          bananapi  broadcom         engicam     in-circuit   linksprite     olimex       pine64      raspberrypi3   roseapplepi          stmicroelectronics  udoo         zynq
 
        
        * We can see that our target "raspberrypi3-64" is supported by the bare-linux source code.                

        * Now from the buildroot directory add the default configurations of raspberrypi3-64 in config file using the following command.

        .. code-block:: c

                $ pwd
                $HOME/buildroot
                $ make raspberrypi3_64_defconfig

        * Run make command from buildroot directory to build the bare-linux

        .. code-block:: c

                $ make

        * Once the build is done, the final target image will be present in the following directory.

        .. code-block:: c

                test:images$ ls -l
                total 134628
                -rwxr-xr-x 1 test test     33555 Jan 30 11:27 bcm2710-rpi-3-b.dtb
                -rwxr-xr-x 1 test test     34182 Jan 30 11:27 bcm2710-rpi-3-b-plus.dtb
                -rwxr-xr-x 1 test test     20720 Jan 30 11:27 bcm2837-rpi-3-b.dtb
                -rw-r--r-- 1 test test  33554432 Jan 30 11:27 boot.vfat
                -rw-r--r-- 1 test test       530 Jan 30 11:27 genimage.cfg
                -rw-r--r-- 1 test test  21324288 Jan 30 11:27 Image
                -rw-r--r-- 1 test test 125829120 Jan 30 11:27 rootfs.ext2
                lrwxrwxrwx 1 test test        11 Jan 30 11:27 rootfs.ext4 -> rootfs.ext2
                drwxr-xr-x 3 test test      4096 Jan 30 11:02 rpi-firmware
                -rw-r--r-- 1 test test 159384064 Jan 30 11:27 sdcard.img
 


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        What is /.bashrc file?

        .. dropdown:: See Answer

                * ??