Currently the eclass file supports the legacy 'or32-*' tuple, but not the current 'or1k-*'. See http://opencores.org/or1k/Or32Toolchain for more details. The fix is needed for building musl based toolchain via crossdev.
Created attachment 441522 [details] or1k-* support
BTW, I'm using this particular eclass tweak for running the following tests - https://pixman.miraheze.org/wiki/OpenRISC_Support
should be fixed with: https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=88bbbd5a0d7e190677c2f22321141146ab1c12f2