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| − | == Overview ==
| + | {{:Transclusion: CL-SOM-iMX7: U-Boot: Building Images}} |
| − | CL-SOM-iMX7 firmware consists of single U-Boot binary image.
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| − | It is based on [http://www.denx.de/wiki/U-Boot/WebHome U-Boot] source code.
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| − | U-Boot is invoked by the CPU internal boot ROM code of the i.MX7 SoC.
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| − | U-Boot initializes hardware modules necessary for system boot and loads the operating system.
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| − | | |
| − | == Building Firmware images for CL-SOM-iMX7 ==
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| − | === Getting U-Boot sources ===
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| − | There are two ways to get U-Boot sources that can be used as a baseline for CL-SOM-iMX7 U-Boot.
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| − | You can create a copy of "Das U-Boot" source tree or download a snapshot and extract it.
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| − | We assume that you have created {{filename|/home/development/cl-som-imx7/u-boot}} directory for CL-SOM-iMX7 u-boot development.
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| − | | |
| − | ==== Snapshot download ====
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| − | * Download [http://git.denx.de/?p=u-boot.git;a=snapshot;h=8cbb389bb3da80cbf8911f8386cbff92c6a78afe;sf=tgz v2016.09] snapshot with your web browser.
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| − | * Extract the downloaded archive {{filename|u-boot-8cbb389.tar.gz}}
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| − | <pre>
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| − | cd /home/development/cl-som-imx7/u-boot
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| − | tar xvf /path/to/downloaded/u-boot-8cbb389.tar.gz
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| − | mv u-boot u-boot-cl-som-imx7
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| − | </pre>
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| − | : This will create {{filename|/home/development/cl-som-imx7/u-boot/u-boot-cl-som-imx7}} directory containing U-Boot source code tree. | |
| − | * Apply the CL-SOM-iMX7 patch
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| − | <pre>
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| − | cd /home/development/cl-som-imx7/u-boot/u-boot-cl-som-imx7
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| − | patch -p1 < /path/to/cl-som-imx7-u-boot-package/u-boot/u-boot-v2016.09-cl-som-imx7-*.patch
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| − | </pre>
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| − | | |
| − | ==== Git clone ====
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| − | * Install [http://git-scm.com/ git] version control system.
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| − | * Create a clone of U-Boot tree
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| − | <pre>
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| − | cd /home/development/cl-som-imx7/u-boot
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| − | git clone git://git.denx.de/u-boot.git u-boot-cl-som-imx7
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| − | cd /home/development/cl-som-imx7/u-boot/u-boot-cl-som-imx7
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| − | </pre>
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| − | * Create a branch for CL-SOM-iMX7 development. The CL-SOM-iMX7 patches are generated vs. v2016.09 tag (8cbb389bb3da80cbf8911f8386cbff92c6a78afe commit) in the U-Boot tree. It is recommended to use exactly the same baseline to avoid merge conflicts.
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| − | <pre>
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| − | git checkout -b cl-som-imx7-dev v2016.09
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| − | </pre>
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| − | * Apply CL-SOM-iMX7 patch
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| − | <pre>
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| − | git am /path/to/cl-som-imx7-u-boot-package/u-boot/patches/*.patch
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| − | </pre>
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| − | | |
| − | === Building the firmware images ===
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| − | * First, compileU-Boot. The following commands create the {{filename|u-boot.imx}} binary (along with other image types):
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| − | <pre>
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| − | export ARCH=arm
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| − | export CROSS_COMPILE=arm-none-linux-eabi-
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| − | make mrproper
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| − | make cl_som_imax7_defconfig && make
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| − | </pre>
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| − | * Rename the U-Boot binary image file:
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| − | <pre>
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| − | cp u-boot.imx cl-som-imx7-firmware
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| − | </pre>
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| − | * You can now install the {{filename|cl-som-imx7-firmware}} file into an SD card or CL-SOM-iMX7 SPI flash.
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| | [[Category:U-Boot]] | | [[Category:U-Boot]] |
| | [[Category:CL-SOM-iMX7]] | | [[Category:CL-SOM-iMX7]] |
Git clone
- Install git version control system.
- Create a clone of U-Boot tree
cd /home/development/cl-som-imx7/u-boot
git clone https://github.com/compulab/u-boot.git -b v2017.07-cl-som-imx7-1.9 u-boot-cl-som-imx7
cd u-boot-cl-som-imx7
- Create a branch for CL-SOM-iMX7 development
git checkout -b cl-som-imx7-1.9-devel
Building the firmware images
- First, compile U-Boot. The following commands create the u-boot.imx binary (along with other image types):
export ARCH=arm
export CROSS_COMPILE=arm-none-linux-eabi-
make mrproper
make cl-som-imx7_defconfig && make
- Merge the SPL and U-Boot images into one firmware image:
dd if=/dev/zero count=640 bs=1K | tr '\000' '\377' > cl-som-imx7-firmware
dd if=SPL of=cl-som-imx7-firmware bs=1K seek=1 conv=notrunc
dd if=u-boot.img of=cl-som-imx7-firmware bs=1K seek=64 conv=notrunc
