For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:wkazubski:CrossToolchain:xtensa/openSUSE_Tumbleweed/home:wkazubski:CrossToolchain:xtensa.repo
zypper refresh
zypper install cross-xtensa-lx106-elf-binutils
For 16.0 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:wkazubski:CrossToolchain:xtensa/16.0/home:wkazubski:CrossToolchain:xtensa.repo
zypper refresh
zypper install cross-xtensa-lx106-elf-binutils
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:wkazubski:CrossToolchain:xtensa/15.6/home:wkazubski:CrossToolchain:xtensa.repo
zypper refresh
zypper install cross-xtensa-lx106-elf-binutils