Using External Kernel and U-Boot with PetaLinux - 2022.2 English

PetaLinux includes kernel source and U-Boot source. However, you can build your own kernel and U-Boot with PetaLinux.

PetaLinux supports local sources for kernel, U-Boot, TF-A, PLM and PSM-FIRMWARE.

For external sources create a directory <plnx-proj-root>/components/ext_sources/.

1. Copy the kernel source directory:

   <plnx-proj-root>/components/ext_sources/<MY-KERNEL>

2. Copy the U-Boot source directory:

   <plnx-proj-root>/components/ext_sources/<MY-U-BOOT>

3. Run petalinux-config, and go into Linux Components Selection sub-menu.
   • For kernel, select linux-kernel () ---> and then select ext-local-src.

     ( ) linux-xlnx

     ( ) remote

     (X) ext-local-src

   • For U-Boot, select u-boot () ---> and then select ext-local-src.

     ( ) u-boot-xlnx

     ( ) remote

     (X) ext-local-src

4. Add external source path.
   • For kernel, select External linux-kernel local source settings --->. Enter the path:

     ${PROOT}/components/ext_sources/<MY-KERNEL>

   • For U-Boot, select External u-boot local source settings --->. Enter the path:

     ${PROOT}/components/ext_sources/<MY-U-BOOT>

     ${PROOT} is a PetaLinux variable pointing to <plnx-proj-root>/ directory. You can also specify an absolute path of the source. The sources can be placed outside the project as well.

     Note: If after setting ext-local-src, you try to change it to linux-xlnx/u-boot-xlnx in petalinux-config, it will give the following warning.

     WARNING: Workspace already setup to use from <ext-local-src path>,
     Use 'petalinux-devtool reset linux-xlnx' To remove this (or) Use this for your development.

   Note: When creating a BSP with external sources in project, it is your responsibility to copy the sources into the project and do the packing. For more information, see Packaging BSP.