Difference between revisions of "i.MX53 SODIMM PC Barebox"
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** Attach rootfs (nfs) | ** Attach rootfs (nfs) | ||
<br /> | <br /> | ||
− | Boot configuration files | + | Boot configuration files support options to define custom kernel and rootfs names or paths: |
<syntaxhighlight lang="bash"> | <syntaxhighlight lang="bash"> | ||
barebox@Voipac VMX53:/ edit /env/boot/net-dtb | barebox@Voipac VMX53:/ edit /env/boot/net-dtb |
Revision as of 18:54, 3 April 2021
i.MX53 SODIMM PC - Development kit uses Barebox as a bootloader. This page displays how to configure and build it.
Barebox is a bootloader responsible for hardware initialization, loading and booting Linux kernel. It is also used for module flashing.
Building images
Set toolchain
Export toolchain variables for every related terminal session.
Set shell variables
BB_VERSION=2014.03.0 SW_VERSION=20150308
Download and extract source code
mkdir -pv ~/workdir/vmx53/barebox/ cd ~/workdir/vmx53/barebox/ wget http://barebox.org/download/barebox-${BB_VERSION}.tar.bz2 tar xvjf barebox-${BB_VERSION}.tar.bz2 mv barebox-${BB_VERSION} barebox-${BB_VERSION}.orig cp -rv barebox-${BB_VERSION}.orig barebox-${BB_VERSION}.work
Download and apply Voipac patches
cd ~/workdir/vmx53/barebox/ wget http://downloads.voipac.com/files/i.MX53_SODIMM_PC-Development_kit/module/software/barebox/sources/barebox-2014.03.0_vmx53_20151129.cfg wget http://downloads.voipac.com/files/i.MX53_SODIMM_PC-Development_kit/module/software/barebox/sources/barebox-2014.03.0_vmx53_20151129.patch cd ~/workdir/vmx53/barebox/barebox-${BB_VERSION}.work patch -p1 < ../barebox-${BB_VERSION}_vmx53_${SW_VERSION}.patch cp ../barebox-${BB_VERSION}_vmx53_${SW_VERSION}.cfg .config
Compile
Output file is called arch/arm/pbl/zbarebox.bin:
cd ~/workdir/vmx53/barebox/barebox-${BB_VERSION}.work #make ARCH=arm menuconfig make -j4
Configure
Edit boot options
Barebox provides 4 boot configurations by default:
- nand-legacy-ubi
- Load kernel (nand - kernel)
- Attach rootfs (nand - rootfs)
- nand-dtb-ubi
- Load kernel (nand - kernel)
- Load device tree (nand - bareboxenv)
- Attach rootfs (nand - rootfs)
- net-legacy
- Load kernel (tftp)
- Attach rootfs (nfs)
- net-dtb
- Load kernel (tftp)
- Load device tree (tftp)
- Attach rootfs (nfs)
Boot configuration files support options to define custom kernel and rootfs names or paths:
barebox@Voipac VMX53:/ edit /env/boot/net-dtb
barebox@Voipac VMX53:/ edit /env/config # list of boot entries. These are executed in order until one # succeeds. An entry can be: # - a filename in /env/boot/ # - a full path to a directory. All files in this directory are # treated as boot files and executed in alphabetical order global.boot.default=nand-dtb-ubi
Set correct DTB file based on module configuration
Each configuration uses an altered device tree:
barebox@Voipac VMX53:/ edit /env/config ... # BASIC=557, PRO=668, MAX=779 #global.vmxmodel=557 global.vmxmodel=668 #global.vmxmodel=779 ... barebox@Voipac VMX53:/ saveenv barebox@Voipac VMX53:/ reset