AR# 76559

描述

In 2021.x and later release version of Yocto or PetaLinux builds, U-boot and the kernel do not show the current build timestamp.

Host Build logs:

xilinx-vck190-es1-2021.1 $ ls -la images/linux/ | grep -i Image
-rw-r--r-- 1 sandeepg boulder 21M Jun 4 09:06 Image
-rw-r--r-- 1 sandeepg boulder 14M Jun 4 09:06 image.ub
xilinx-vck190-es1-2021.1 $

Target logs:

root@xilinx-vck190-es1-2021_1:~# uname -a
Linux xilinx-vck190-es1-2021_1 5.10.0-xilinx-v2020.2 #1 SMP Fri May 28 08:10:27 UTC 2021 aarch64 GNU/Linux
root@xilinx-vck190-es1-2021_1:~#

解决方案

This is the default behavior in Yocto 3.2 (Gatesgarth release) and later releases.

The timestamp is based on the last git commit so if any modification is made to linux-xlnx or other recipes the timestamp will be updated.

For more details see https://wiki.yoctoproject.org/wiki/Reproducible_Builds

To work around this issue, disable reproducible binaries by adding the below variables in petalinuxbsp.conf or local.conf

PetaLinux:

The work-around should be applied to <plnx-proj-root>/project-spec/meta-user/conf/petalinuxbsp.conf configuration files.

1) Modify petalinuxbsp.conf with the below content using a text editor:

$ vim <plnx-proj-root>/project-spec/meta-user/conf/petalinuxbsp.conf
  
# For linux-xlnx
BUILD_REPRODUCIBLE_BINARIES_pn-linux-xlnx = "0"
# For u-boot-xlnx
BUILD_REPRODUCIBLE_BINARIES_pn-u-boot-xlnx = "0"

2) Clean the linux-xlnx/u-boot-xlnx sstate cache and rebuild the linux-xlnx/u-boot-xlnx recipes:

$ petalinux-build -c linux-xlnx -x cleansstate; petalinux-build -c u-boot-xlnx -x cleansstate
$ petalinux-build -c linux-xlnx; petalinux-build -c u-boot-xlnx

Yocto:

The work-around should be applied to the <yocto-proj-root>/build/conf/local.conf configuration files.

1) Modify the local.conf file with the below content using a text editor:

$ vim <yocto-proj-root>/build/conf/local.conf
  
# For linux-xlnx
BUILD_REPRODUCIBLE_BINARIES_pn-linux-xlnx = "0"
# For u-boot-xlnx
BUILD_REPRODUCIBLE_BINARIES_pn-u-boot-xlnx = "0"

2) Clean the linux-xlnx/u-boot-xlnx sstate cache and rebuild the linux-xlnx/u-boot-xlnx recipes:

$ bitbake linux-xlnx -c cleansstate; bitbake u-boot-xlnx -c cleansstate;
$ bitbake linux-xlnx; bitbake u-boot-xlnx

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