Wind River Support Network


LIN7-6968 : On beaglebone, kernel alternative image RPM is not properly created.

Created: Nov 7, 2016    Updated: Sep 8, 2018
Resolved Date: Nov 13, 2016
Found In Version:,
Fix Version:
Severity: Standard
Applicable for: Wind River Linux 7
Component/s: Build & Config


WRLinux (both and at least) on Beaglebone ARM board, the kernel alternative image RPM (kernel-alt-image-3.14.39ltsi-wr7.0.0.18-standard-3.14-r0.1.ti_am335x.rpm) is not properly built. When installed on target, its postinstall scripts will fail with the following error:

update-alternatives: --install needs <link> <name> <path> <priority>

Usage: update-alternatives --install <link> <name> <path> <priority>
       update-alternatives --remove <name> <path>
       update-alternatives --help
<link> is the link pointing to the provided path (ie. /usr/bin/foo).
<name> is the name in /var/lib/opkg/alternatives/alternatives (ie. foo)
<path> is the name referred to (ie. /usr/bin/foo-extra-spiffy)
<priority> is an integer; options with higher numbers are chosen. 

As we can see from the postinstall scripts in this RPM (posted below), the update-alternatives command in the scripts missed one parameter. 

rpm -qp --scripts kernel-alt-image-3.14.39ltsi-wr7.0.0.18-standard-3.14-r0.1.ti_am335x.rpm
warning: kernel-alt-image-3.14.39ltsi-wr7.0.0.18-standard-3.14-r0.1.ti_am335x.rpm: Header V4 DSA/SHA1 Signature, key ID a42d4447: NOKEY
postinstall scriptlet (using /bin/sh):
# kernel-alt-image-3.14.39ltsi-wr7.0.0.18-standard - postinst
update-alternatives --install /boot/ /boot/-3.14.39ltsi-WR7.0.0.18_standard 31414 || true
postuninstall scriptlet (using /bin/sh):
# kernel-alt-image-3.14.39ltsi-wr7.0.0.18-standard - postrm
if [ "$1" = "0" ] ; then
update-alternatives --remove -3.14.39ltsi-WR7.0.0.18_standard || true

This issue is found during testing IoT kernel OTA update. Please refer to NOVA-666 for more details. 


The root cause is that somehow KERNEL_ALT_IMAGETYPE is not set (empty) in the build procedure of the kernel alternative image RPM. The update-alternatives' parameters should be something like:

update-alternatives --install /boot/zImage zImage /boot/zImage-3.14.39ltsi-WR7.0.0.18_standard 31414

So a workaround is to set KERNEL_ALT_IMAGETYPE = "${KERNEL_IMAGETYPE}" in any kernel bb append linux-windriver_3.14.bbappend.

Steps to Reproduce

- configure and build an image for Beaglebone (ti-am335x as bsp)
- boot the target with the image
- try to install the kernel-alt-image-3.14.39ltsi-wr7.0.0.18-standard-3.14-r0.1.ti_am335x.rpm on the target 
  (probably rpm -Uv --replacepkgs  kernel-alt-image-3.14.39ltsi-wr7.0.0.18-standard-3.14-r0.1.ti_am335x.rpm)
- it will fail with the error message

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