Difference between revisions of "i.MX53 SODIMM PC Barebox"

Latest revision as of 21:50, 23 October 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 stored in arch/arm/pbl/zbarebox.bin:

cd ~/workdir/vmx53/barebox/barebox-${BB_VERSION}.work
#make ARCH=arm menuconfig
make -j4

Configuring bootloader environment

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 custom kernel definition. These settings also allow updating paths or names for binaries:

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

DTB file selection

As different module configurations use altered device trees, defining the correct board variant is important:

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

@@ Line 1: / Line 1: @@
-[[Category:i.MX53 SODIMM PC - Development kit]]
+[[Category:i.MX53 SODIMM PC - Development Kit]]
 [[Category:Barebox]]
 <!-- -->
 <div style="float:right">__TOC__</div>
-i.MX53 SODIMM PC - Development kit uses Barebox as a bootloader. This page displays how to configure and build it.<br /><br />
+i.MX53 SODIMM PC - Development Kit uses Barebox as a bootloader. This page displays how to configure and build it.<br /><br />
 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 [[i.MX53_SODIMM_PC_Toolchain|toolchain variables]] for every related terminal session.
@@ Line 29: / Line 28: @@
 </syntaxhighlight>
-=== Download Voipac patches ===
+=== Download and apply Voipac patches ===
 <syntaxhighlight lang="bash">
 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.cfg
-wget http://downloads.voipac.com/files/i.MX53_SODIMM_PC-Development_kit/module/software/barebox/sources/barebox-2014.03.0_vmx53_20151129.patch
+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_${SW_VERSION}.patch
@@ Line 40: / Line 39: @@
 === Compile ===
-Output file is called arch/arm/pbl/zbarebox.bin:
+Output file is stored in arch/arm/pbl/zbarebox.bin:
 <syntaxhighlight lang="bash">
 cd ~/workdir/vmx53/barebox/barebox-${BB_VERSION}.work
@@ Line 47: / Line 46: @@
 </syntaxhighlight>
-== Configure ==
+== Configuring bootloader environment ==
 === Edit boot options ===
@@ Line 66: / Line 64: @@
 ** Load device tree (tftp)
 ** Attach rootfs (nfs)
-<br /><br />
+<br />
-Boot configuration files include options to define custom kernel and rootfs names or paths:
+Boot configuration files support custom kernel definition. These settings also allow updating paths or names for binaries:
 <syntaxhighlight lang="bash">
 barebox@Voipac VMX53:/ edit /env/boot/net-dtb
@@ Line 83: / Line 81: @@
 </syntaxhighlight>
-=== Set correct DTB file based on module configuration ===
+=== DTB file selection ===
-Each configuration uses an altered device tree:
+As different module configurations use altered device trees, defining the correct board variant is important:
 <syntaxhighlight lang="bash">
 barebox@Voipac VMX53:/ edit /env/config