Add travis cia for openrisc kernel

This should not go upstream.  Just keep in openrisc repos.

Changes since v1
 - add libelf for x86 build failure

Changes since v2
 - fix .gitignore conflict
 - update gcc toolchain to 9.0.0

Changes since v3
 - fix conflict in .gitconfig
 - update image to bionic
 - fixup mpfr with a ln hack, needed by or1k toolchain

Changes since v4
 - convert from travis to github CI

Changes since v5
 - Update to use latest ubuntu
 - Use embecosm toolchain

.github/workflows/ci.yml

@@ -0,0 +1,47 @@
+name: ci
+
+on: [push, pull_request, workflow_dispatch]
+
+jobs:
+  kernel-builds:
+    runs-on: ubuntu-latest
+    env:
+      LD_LIBRARY_PATH: "/tmp/tools/lib"
+      CONFIG: ${{ matrix.env.CONFIG }}
+      ARCH: ${{ matrix.env.ARCH }}
+      CROSS_COMPILE: ${{ matrix.env.CROSS_COMPILE }}
+    steps:
+      # Checkout Repository
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      # Install OS Tools
+      - name: Install Tools
+        run: |
+          sudo apt-get install build-essential bc xz-utils git iverilog libelf-dev
+      # Install Toolchain
+      - name: Install Toolchain
+        run: |
+          mkdir -p /tmp/tools
+          cd /tmp/tools
+          curl --remote-name --location \
+            https://buildbot.embecosm.com/job/or1k-gcc-ubuntu2204-release/5/artifact/or1k-embecosm-ubuntu2204-gcc13.1.0.tar.gz
+          tar -xf or1k-embecosm-ubuntu2204-gcc13.1.0.tar.gz
+          export PATH=$PATH:/tmp/tools/or1k-embecosm-ubuntu2204-gcc13.1.0/bin
+          or1k-elf-gcc --version
+      - name: Run Build
+        shell: bash {0}
+        run: |
+          export PATH=$PATH:/tmp/tools/or1k-embecosm-ubuntu2204-gcc13.1.0/bin
+          make ARCH=$ARCH $CONFIG && make ARCH=$ARCH CROSS_COMPILE=$CROSS_COMPILE -j$(($(nproc) + 1))
+
+    strategy:
+      matrix:
+        env:
+          - { ARCH: "openrisc", CONFIG: "defconfig", CROSS_COMPILE: "or1k-elf-" }
+          - { ARCH: "openrisc", CONFIG: "allnoconfig", CROSS_COMPILE: "or1k-elf-" }
+          - { ARCH: "openrisc", CONFIG: "alldefconfig", CROSS_COMPILE: "or1k-elf-" }
+          - { ARCH: "x86", CONFIG: "defconfig", CROSS_COMPILE: "" }
+         # fails with ./usr/include/linux/if.h:28:10: fatal error: sys/socket.h:
+         # No such file or directory
+         #- { ARCH: "openrisc", CONFIG: "allyesconfig", CROSS_COMPILE: "or1k-elf-" }

.gitignore

@@ -108,10 +108,12 @@ modules.order
 !.editorconfig
 !.get_maintainer.ignore
 !.gitattributes
+!.github/
 !.gitignore
 !.kunitconfig
 !.mailmap
 !.rustfmt.toml
+!.travis.yml
 
 #
 # Generated include files

.travis.yml

@@ -0,0 +1,27 @@
+dist: bionic    # bionic needed for gcc 7.4 retpoline
+sudo: false
+language: c
+branches:
+  - travis
+addons:
+  apt:
+    sources:
+      - ubuntu-toolchain-r-test # get gcc-6
+    packages:
+      - build-essential
+      - bc                      # basic for linux build
+      - libmpc3                 # needed for or1k-linux- toolchain
+      - libelf-dev
+env:
+  matrix:
+    - ARCH=openrisc    CONFIG=defconfig     CROSS_COMPILE=or1k-linux-
+    - ARCH=openrisc    CONFIG=allnoconfig   CROSS_COMPILE=or1k-linux-
+    - ARCH=openrisc    CONFIG=allyesconfig  CROSS_COMPILE=or1k-linux-
+    - ARCH=openrisc    CONFIG=alldefconfig  CROSS_COMPILE=or1k-linux-
+    - ARCH=x86    CONFIG=defconfig
+before_install:
+  - wget https://github.com/stffrdhrn/gcc/releases/download/or1k-9.0.0-20180613/or1k-linux-9.0.0-20180612.tar.xz -O /tmp/gcc.tar.xz
+  - tar -xf /tmp/gcc.tar.xz
+  - sudo ln -s /usr/lib/x86_64-linux-gnu/libmpfr.so.6 /usr/lib/x86_64-linux-gnu/libmpfr.so.4 # because or1k toolchain needs old mpfr
+  - export PATH=$PATH:$PWD/or1k-linux/bin
+script:  make $CONFIG && make -j2

readme.md

@@ -0,0 +1,16 @@
+# OpenRISC Linux CI build branch
+
+This branch just has the github ci commits on top of the main
+branch.
+
+Its a bit of a hack but we dont want travis files to get into
+upstream so I thought this way is good. If there is a better
+way let me know.
+
+To update latest code:
+
+```
+git checkout travis
+git rebase -i for-next
+git push origin travis
+```