If BSP supported Multilib, the README describes about Multilib. eg, <project>/README/12-README-fsl-ls1043 ---- 5.2. Multilib ------------- By default, this BSP is configured as a 64-bit kernel and 64-bit userspace, if a full 32-bit filesystem is necessary, please append the following into your project configuration command: --enable-multilib=lib32 ---- Our user wants to know how to eable/use multilib on the BSP. The above "Multilib" is not helpful. If BSP supported Multilib, our user does not need to - adding --enable-multilib option - adding MULTILIBS, AVAILTUNES and DEFAULTTUNE_virtclass-multilib-lib32 to <project>/local.conf eg, the following configured rootfs supported multilib, right? default binary is 64bit and 32bit also supported: /opt/wrs/wrlinux/8.0/WindRiver.ls/wrlinux-8/wrlinux/configure --enable-board=fsl-ls1043 --enable-kernel=standard --enable-rootfs=glibc-std