Merge pull request #192 from nathanchance/mips

Add support for MIPS 32-bit little endian

Author: nathanchance

buildroot/mipsel.config

@@ -0,0 +1,15 @@
+BR2_mipsel=y
+BR2_OPTIMIZE_3=y
+BR2_KERNEL_HEADERS_4_4=y
+BR2_BINUTILS_VERSION_2_31_X=y
+BR2_GCC_VERSION_8_X=y
+BR2_TARGET_GENERIC_ROOT_PASSWD="root"
+BR2_TARGET_GENERIC_GETTY_PORT="ttyAMA0"
+BR2_ROOTFS_OVERLAY="../overlay-poweroff"
+BR2_PACKAGE_BUSYBOX_SHOW_OTHERS=y
+BR2_PACKAGE_BASH=y
+BR2_TARGET_ROOTFS_CPIO=y
+BR2_TARGET_ROOTFS_EXT2=y
+BR2_TARGET_ROOTFS_EXT2_4=y
+BR2_TARGET_ROOTFS_EXT2_SIZE="20M"
+# BR2_TARGET_ROOTFS_TAR is not set

buildroot/rebuild.sh

@@ -25,7 +25,7 @@ CONFIGS=()
 while (( ${#} )); do
     case ${1} in
         all) for CONFIG in *.config; do CONFIGS+=( "../${CONFIG}" ); done ;;
-        arm64|arm|ppc32|ppc64le|x86_64) CONFIGS+=( "../${1}.config" ) ;;
+        arm64|arm|mipsel|ppc32|ppc64le|x86_64) CONFIGS+=( "../${1}.config" ) ;;
         *) echo "Unknown parameter '${1}', exiting!"; exit 1 ;;
     esac
     shift

driver.sh

@@ -89,21 +89,17 @@ setup_variables() {
                      -append "console=ttyAMA0 root=/dev/vda" )
       export CROSS_COMPILE=aarch64-linux-gnu- ;;
 
-    "x86_64")
-      case ${REPO} in
-        common-*)
-          config=x86_64_cuttlefish_defconfig
-          qemu_cmdline=( -append "console=ttyS0"
-                         -initrd "images/x86_64/rootfs.cpio" ) ;;
-        *)
-          config=defconfig
-          qemu_cmdline=( -drive "file=images/x86_64/rootfs.ext4,format=raw,if=ide"
-                         -append "console=ttyS0 root=/dev/sda" ) ;;
-      esac
-      # Use KVM if the processor supports it (first part) and the KVM module is loaded (second part)
-      [[ $(grep -c -E 'vmx|svm' /proc/cpuinfo) -gt 0 && $(lsmod 2>/dev/null | grep -c kvm) -gt 0 ]] && qemu_cmdline=( "${qemu_cmdline[@]}" -enable-kvm )
-      image_name=bzImage
-      qemu="qemu-system-x86_64" ;;
+    "mipsel")
+      config=malta_defconfig
+      image_name=vmlinux
+      qemu="qemu-system-mipsel"
+      qemu_cmdline=( -machine malta
+                     -cpu 24Kf
+                     -append "root=/dev/sda"
+                     -drive "file=images/mipsel/rootfs.ext4,format=raw,if=ide" )
+      export ARCH=mips
+      export CROSS_COMPILE=mipsel-linux-gnu- ;;
+
     "ppc32")
       config=ppc44x_defconfig
       image_name=zImage
@@ -129,6 +125,22 @@ setup_variables() {
       export ARCH=powerpc
       export CROSS_COMPILE=powerpc64le-linux-gnu- ;;
 
+    "x86_64")
+      case ${REPO} in
+        common-*)
+          config=x86_64_cuttlefish_defconfig
+          qemu_cmdline=( -append "console=ttyS0"
+                         -initrd "images/x86_64/rootfs.cpio" ) ;;
+        *)
+          config=defconfig
+          qemu_cmdline=( -drive "file=images/x86_64/rootfs.ext4,format=raw,if=ide"
+                         -append "console=ttyS0 root=/dev/sda" ) ;;
+      esac
+      # Use KVM if the processor supports it (first part) and the KVM module is loaded (second part)
+      [[ $(grep -c -E 'vmx|svm' /proc/cpuinfo) -gt 0 && $(lsmod 2>/dev/null | grep -c kvm) -gt 0 ]] && qemu_cmdline=( "${qemu_cmdline[@]}" -enable-kvm )
+      image_name=bzImage
+      qemu="qemu-system-x86_64" ;;
+
     # Unknown arch, error out
     *)
       echo "Unknown ARCH specified!"
@@ -293,7 +305,14 @@ build_linux() {
 }
 
 boot_qemu() {
-  local kernel_image=${tree}/arch/${ARCH}/boot/${image_name}
+  local kernel_image
+
+  if [[ ${image_name} = "vmlinux" ]]; then
+    kernel_image=${tree}/vmlinux
+  else
+    kernel_image=${tree}/arch/${ARCH}/boot/${image_name}
+  fi
+
   test -e ${kernel_image}
   qemu=( timeout 2m unbuffer "${qemu}"
                              -m "${qemu_ram:=512m}"