diff --git a/.github/workflows/crossdev.yml b/.github/workflows/crossdev.yml
index 828aff9..8c01021 100644
--- a/.github/workflows/crossdev.yml
+++ b/.github/workflows/crossdev.yml
@@ -17,9 +17,75 @@ jobs:
         target:
           - aarch64-unknown-linux-gnu
           - aarch64-unknown-linux-musl
+          - arm-unknown-linux-gnueabi
+          - arm-unknown-linux-gnueabihf
+          - arm-unknown-linux-musleabi
+          - arm-unknown-linux-musleabihf
+          - armeb-unknown-linux-gnueabi
+          - armeb-unknown-linux-gnueabihf
+          - armeb-unknown-linux-musleabi
+          - armeb-unknown-linux-musleabihf
+          - armv7-unknown-linux-gnueabi
+          - armv7-unknown-linux-gnueabihf
+          - armv7-unknown-linux-musleabi
+          - armv7-unknown-linux-musleabihf
+          - loongaarch64-unknown-linux-gnu
+          - loongaarch64-unknown-linux-musl
+          - m68k-unknown-linux-gnu
+          - mips-unknown-linux-gnu
+          - mips-unknown-linux-musl
+          - mipsel-unknown-linux-gnu
+          - mipsel-unknown-linux-musl
+          - mips64-unknown-linux-gnu
+          - mips64-unknown-linux-musl
+          - mips64el-unknown-linux-gnu
+          - mips64el-unknown-linux-musl
+          - or1k-unknown-linux-gnu
+          - or1k-unknown-linux-musl
+          - powerpc-unknown-linux-gnu
+          - powerpc-unknown-linux-musl
+          - powerpc64-unknown-linux-gnu
+          - powerpc64-unknown-linux-musl
+          - riscv32-unknown-linux-gnu
+          - riscv32-unknown-linux-musl
+          - riscv64-unknown-linux-gnu
+          - riscv64-unknown-linux-musl
+          - sparc-unknown-linux-gnu
+          - sparc64-unknown-linux-gnu
+          - s390x-unknown-linux-gnu
+          - s390x-unknown-linux-musl
+          - sh2-unknown-linux-gnu
+          - sh2-unknown-linux-musl
+          - sh2eb-unknown-linux-gnu
+          - sh2eb-unknown-linux-musl
+          - sh4-unknown-linux-gnu
+          - sh4-unknown-linux-musl
+          - sh4eb-unknown-linux-gnu
+          - sh4eb-unknown-linux-musl
+          - x86_64-unknown-linux-gnu
+          - x86_64-unknown-linux-musl
         stage3:
           - latest # `openrc` (glibc+GCC) is tagged as `latest`
           - musl
+        # We exclude combinations which are known to be broken.
+        # Pull requests fixing them welcome!
+        exclude:
+          # glibc fails to build: `attempt to use an ARM instruction on a
+          # Thumb-only processor`.
+          - target: armv7-unknown-linux-gnueabi
+          - target: armv7-unknown-linux-gnueabihf
+          # libgcc_s.so fails to build: `cannot find crti.o: No such file or
+          # directory`.
+          - target: mips64-unknown-linux-musl
+          - target: mips64el-unknown-linux-musl
+          # busybox fails to buils: `‘SYS_settimeofday’ undeclared`.
+          - target: riscv32-unknown-linux-musl
+          # glibc fails to build: `no support for pre-v8 sparc`.
+          - target: sparc-unknown-linux-gnu
+          # musl ebuilds don't support s390x. The target is supported upstream,
+          # we need to fix and test our ebuilds.
+          - target: s390x-unknown-linux-musl
+      fail-fast: false
     name: crossdev target=${{ matrix.target }} stage3=${{ matrix.stage3 }}
     runs-on: ubuntu-latest
     steps: