From 24ae8229485aaa67b2e93643750676351f228242 Mon Sep 17 00:00:00 2001
From: Rob Landley <rob@landley.net>
Date: Tue, 14 Jan 2020 06:56:49 -0600
Subject: Convert to smaller config format.

---
 scripts/mkroot.sh | 501 +++++++++++++-----------------------------------------
 1 file changed, 115 insertions(+), 386 deletions(-)

(limited to 'scripts/mkroot.sh')

diff --git a/scripts/mkroot.sh b/scripts/mkroot.sh
index 75ab0eeb..e27c06b4 100755
--- a/scripts/mkroot.sh
+++ b/scripts/mkroot.sh
@@ -6,20 +6,16 @@
     CROSS_COMPILE="$CROSS_COMPILE" CROSS_SHORT="$CROSS_SHORT" "$0" "$@"
 
 # assign command line NAME=VALUE args to env vars
-while [ $# -ne 0 ]
-do
-  X="${1/=*/}"
-  Y="${1#*=}"
+while [ $# -ne 0 ]; do
+  X="${1/=*/}" Y="${1#*=}"
   [ "${1/=/}" != "$1" ] && eval "export $X=\"\$Y\"" || echo "unknown $i"
   shift
 done
 
 # If we're cross compiling, set appropriate environment variables.
-if [ -z "$CROSS_COMPILE" ]
-then
+if [ -z "$CROSS_COMPILE" ]; then
   echo "Building natively"
-  if ! cc --static -xc - -o /dev/null <<< "int main(void) {return 0;}"
-  then
+  if ! cc --static -xc - -o /dev/null <<< "int main(void) {return 0;}"; then
     echo "Warning: host compiler can't create static binaries." >&2
     sleep 3
   fi
@@ -28,8 +24,7 @@ else
   CROSS_BASE="$(basename "$CROSS_COMPILE")"
   [ -z "$CROSS_SHORT" ] && CROSS_SHORT="${CROSS_BASE/-*/}"
   echo "Cross compiling to $CROSS_SHORT"
-  if [ -z "$CROSS_PATH" ]
-  then
+  if [ -z "$CROSS_PATH" ]; then
     echo "no ${CROSS_COMPILE}cc in path" >&2
     exit 1
   fi
@@ -45,10 +40,8 @@ MYBUILD="$BUILD/${CROSS_BASE:-host-}tmp"
 rm -rf "$MYBUILD" && mkdir -p "$MYBUILD" || exit 1
 
 # Stabilize cross compiling by providing known $PATH contents
-if [ ! -z "$CROSS_COMPILE" ]
-then
-  if [ ! -e "$AIRLOCK/toybox" ]
-  then
+if [ ! -z "$CROSS_COMPILE" ]; then
+  if [ ! -e "$AIRLOCK/toybox" ]; then
     echo === Create airlock dir
 
     PREFIX="$AIRLOCK" KCONFIG_CONFIG="$TOP"/.airlock CROSS_COMPILE= \
@@ -71,8 +64,7 @@ export PATH=/bin:/sbin
 
 mountpoint -q proc || mount -t proc proc proc
 mountpoint -q sys || mount -t sysfs sys sys
-if ! mountpoint -q dev
-then
+if ! mountpoint -q dev; then
   mount -t devtmpfs dev dev || mdev -s
   for i in ,fd /0,stdin /1,stdout /2,stderr
   do ln -sf /proc/self/fd${i/,*/} dev/${i/*,/}; done
@@ -81,8 +73,7 @@ then
   chmod +t /dev/shm
 fi
 
-if [ $$ -eq 1 ]
-then
+if [ $$ -eq 1 ]; then
   # Setup networking for QEMU (needs /proc)
   ifconfig eth0 10.0.2.15
   route add default gw 10.0.2.2
@@ -102,29 +93,21 @@ fi
 EOF
 chmod +x "$ROOT"/init &&
 
-# /etc/passwd with both kernel special accounts (root and nobody) + guest user
+# passwd and group with kernel special accounts (root and nobody) + guest user
 cat > "$ROOT"/etc/passwd << 'EOF' &&
-root::0:0:root:/root:/bin/sh
+echo -e 'root::0:0:root:/root:/bin/sh
 guest:x:500:500:guest:/home/guest:/bin/sh
 nobody:x:65534:65534:nobody:/proc/self:/dev/null
 EOF
-
-# /etc/group with groups corresponding to each /etc/passwd user
-cat > "$ROOT"/etc/group << 'EOF' &&
-root:x:0:
-guest:x:500:
-nobody:x:65534:
-EOF
+echo -e 'root:x:0:\nguest:x:500:\nnobody:x:65534:' > "$ROOT"/etc/group &&
 
 # /etc/resolv.conf using Google's public nameserver. (We could use QEMU's
 # 10.0.2.2 forwarder here, but this way works in both chroot and QEMU.)
 echo "nameserver 8.8.8.8" > "$ROOT"/etc/resolv.conf || exit 1
 
 # Build toybox
-
 make clean
-if [ -z .config ]
-then
+if [ -z .config ]; then
   make defconfig
   # Work around musl-libc design flaw.
   [ "${CROSS_BASE/fdpic//}" != "$CROSS_BASE" ] &&
@@ -134,376 +117,122 @@ else
 fi
 LDFLAGS=--static PREFIX="$ROOT" make toybox install || exit 1
 
-# Abort early if no kernel source specified
-if [ -z "$LINUX" ] || [ ! -d "$LINUX/kernel" ]
-then
-  echo 'No $LINUX directory, kernel build skipped.'
-  rmdir "$MYBUILD" "$BUILD" 2>/dev/null
-  exit 0
-fi
-
-# Which architecture are we building a kernel for?
-[ -z "$TARGET" ] && TARGET="${CROSS_BASE/-*/}"
-[ -z "$TARGET" ] && TARGET="$(uname -m)"
-
-# Target-specific info in an (alphabetical order) if/else staircase
-# Each target needs board config, serial console, RTC, ethernet, block device.
-
-if [ "$TARGET" == armv5l ]
-then
-
-  # This could use the same VIRT board as armv7, but let's demonstrate a
-  # different one requiring a separate device tree binary.
-  QEMU="qemu-system-arm -M versatilepb -net nic,model=rtl8139 -net user"
-  KARCH=arm
-  KARGS="console=ttyAMA0"
-  VMLINUX=arch/arm/boot/zImage
-  KERNEL_CONFIG="
-CONFIG_CPU_ARM926T=y
-CONFIG_MMU=y
-CONFIG_VFP=y
-CONFIG_ARM_THUMB=y
-CONFIG_AEABI=y
-CONFIG_ARCH_VERSATILE=y
-
-# The switch to device-tree-only added this mess
-CONFIG_ATAGS=y
-CONFIG_DEPRECATED_PARAM_STRUCT=y
-CONFIG_ARM_ATAG_DTB_COMPAT=y
-CONFIG_ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND=y
-
-CONFIG_SERIAL_AMBA_PL011=y
-CONFIG_SERIAL_AMBA_PL011_CONSOLE=y
-
-CONFIG_RTC_CLASS=y
-CONFIG_RTC_DRV_PL031=y
-CONFIG_RTC_HCTOSYS=y
-
-CONFIG_PCI=y
-CONFIG_PCI_VERSATILE=y
-CONFIG_BLK_DEV_SD=y
-CONFIG_SCSI=y
-CONFIG_SCSI_LOWLEVEL=y
-CONFIG_SCSI_SYM53C8XX_2=y
-CONFIG_SCSI_SYM53C8XX_DMA_ADDRESSING_MODE=0
-CONFIG_SCSI_SYM53C8XX_MMIO=y
-
-CONFIG_NET_VENDOR_REALTEK=y
-CONFIG_8139CP=y
-"
-  DTB=arch/arm/boot/dts/versatile-pb.dtb
-elif [ "$TARGET" == armv7l ] || [ "$TARGET" == aarch64 ]
-then
-  if [ "$TARGET" == aarch64 ]
-  then
-    QEMU="qemu-system-aarch64 -M virt -cpu cortex-a57"
-    KARCH=arm64
-    VMLINUX=arch/arm64/boot/Image
-  else
-    QEMU="qemu-system-arm -M virt"
-    KARCH=arm
-    VMLINUX=arch/arm/boot/zImage
-  fi
-  KARGS="console=ttyAMA0"
-  KERNEL_CONFIG="
-CONFIG_MMU=y
-CONFIG_ARCH_MULTI_V7=y
-CONFIG_ARCH_VIRT=y
-CONFIG_SOC_DRA7XX=y
-CONFIG_ARCH_OMAP2PLUS_TYPICAL=y
-CONFIG_ARCH_ALPINE=y
-CONFIG_ARM_THUMB=y
-CONFIG_VDSO=y
-CONFIG_CPU_IDLE=y
-CONFIG_ARM_CPUIDLE=y
-CONFIG_KERNEL_MODE_NEON=y
-
-CONFIG_SERIAL_AMBA_PL011=y
-CONFIG_SERIAL_AMBA_PL011_CONSOLE=y
-
-CONFIG_RTC_CLASS=y
-CONFIG_RTC_HCTOSYS=y
-CONFIG_RTC_DRV_PL031=y
-
-CONFIG_NET_CORE=y
-CONFIG_VIRTIO_MENU=y
-CONFIG_VIRTIO_NET=y
-
-CONFIG_PCI=y
-CONFIG_PCI_HOST_GENERIC=y
-CONFIG_VIRTIO_BLK=y
-CONFIG_VIRTIO_PCI=y
-CONFIG_VIRTIO_MMIO=y
-
-CONFIG_ATA=y
-CONFIG_ATA_SFF=y
-CONFIG_ATA_BMDMA=y
-CONFIG_ATA_PIIX=y
-
-CONFIG_PATA_PLATFORM=y
-CONFIG_PATA_OF_PLATFORM=y
-CONFIG_ATA_GENERIC=y
-"
-elif [ "$TARGET" == i486 ] || [ "$TARGET" == i686 ] ||
-     [ "$TARGET" == x86_64 ] || [ "$TARGET" == x32 ]
-then
-  if [ "$TARGET" == i486 ]
-  then
-    QEMU="qemu-system-i386 -cpu 486 -global fw_cfg.dma_enabled=false"
-    KERNEL_CONFIG="CONFIG_M486=y"
-  elif [ "$TARGET" == i686 ]
-  then
-    QEMU="qemu-system-i386 -cpu pentium3"
-    KERNEL_CONFIG="CONFIG_MPENTIUMII=y"
-  else
-    QEMU=qemu-system-x86_64
-    KERNEL_CONFIG="CONFIG_64BIT=y"
-    [ "$TARGET" == x32 ] && KERNEL_CONFIG="$KERNEL_CONFIG
-CONFIG_X86_X32=y"
-  fi
-  KARCH=x86
-  KARGS="console=ttyS0"
-  VMLINUX=arch/x86/boot/bzImage
-  CONFIG_MPENTIUMII=y
-  KERNEL_CONFIG="
-$KERNEL_CONFIG
-
-CONFIG_UNWINDER_FRAME_POINTER=y
-
-CONFIG_PCI=y
-CONFIG_BLK_DEV_SD=y
-CONFIG_ATA=y
-CONFIG_ATA_SFF=y
-CONFIG_ATA_BMDMA=y
-CONFIG_ATA_PIIX=y
-
-CONFIG_NET_VENDOR_INTEL=y
-CONFIG_E1000=y
-CONFIG_SERIAL_8250=y
-CONFIG_SERIAL_8250_CONSOLE=y
-CONFIG_RTC_CLASS=y
-"
-elif [ "$TARGET" == mips ] || [ "$TARGET" == mipsel ]
-then
-  QEMU="qemu-system-mips -M malta"
-  KARCH=mips
-  KARGS="console=ttyS0"
-  VMLINUX=vmlinux
-  KERNEL_CONFIG="
-CONFIG_MIPS_MALTA=y
-CONFIG_CPU_MIPS32_R2=y
-CONFIG_SERIAL_8250=y
-CONFIG_SERIAL_8250_CONSOLE=y
-
-CONFIG_PCI=y
-CONFIG_BLK_DEV_SD=y
-CONFIG_ATA=y
-CONFIG_ATA_SFF=y
-CONFIG_ATA_BMDMA=y
-CONFIG_ATA_PIIX=y
-
-CONFIG_NET_VENDOR_AMD=y
-CONFIG_PCNET32=y
-
-CONFIG_POWER_RESET=y
-CONFIG_POWER_RESET_SYSCON=y
-"
-  [ "$TARGET" == mipsel ] &&
-    KERNEL_CONFIG="${KERNEL_CONFIG}CONFIG_CPU_LITTLE_ENDIAN=y" &&
-    QEMU="qemu-system-mipsel -M malta"
-elif [ "$TARGET" == powerpc ]
-then
-  KARCH=powerpc
-  QEMU="qemu-system-ppc -M g3beige"
-  KARGS="console=ttyS0"
-  VMLINUX=vmlinux
-  KERNEL_CONFIG="
-CONFIG_ALTIVEC=y
-CONFIG_PPC_PMAC=y
-CONFIG_PPC_OF_BOOT_TRAMPOLINE=y
-
-CONFIG_IDE=y
-CONFIG_IDE_GD=y
-CONFIG_IDE_GD_ATA=y
-CONFIG_BLK_DEV_IDE_PMAC=y
-CONFIG_BLK_DEV_IDE_PMAC_ATA100FIRST=y
-
-CONFIG_MACINTOSH_DRIVERS=y
-CONFIG_ADB=y
-CONFIG_ADB_CUDA=y
-
-CONFIG_NET_VENDOR_NATSEMI=y
-CONFIG_NET_VENDOR_8390=y
-CONFIG_NE2K_PCI=y
-
-CONFIG_SERIO=y
-CONFIG_SERIAL_PMACZILOG=y
-CONFIG_SERIAL_PMACZILOG_TTYS=y
-CONFIG_SERIAL_PMACZILOG_CONSOLE=y
-CONFIG_BOOTX_TEXT=y
-"
-elif [ "$TARGET" == powerpc64le ]
-then
-  KARCH=powerpc
-  QEMU="qemu-system-ppc64 -M pseries -vga none"
-  KARGS="console=/dev/hvc0"
-  VMLINUX=vmlinux
-  KERNEL_CONFIG="CONFIG_PPC64=y
-CONFIG_PPC_PSERIES=y
-CONFIG_CPU_LITTLE_ENDIAN=y
-CONFIG_PPC_OF_BOOT_TRAMPOLINE=y
-
-CONFIG_BLK_DEV_SD=y
-CONFIG_SCSI_LOWLEVEL=y
-CONFIG_SCSI_IBMVSCSI=y
-CONFIG_ATA=y
-
-CONFIG_NET_VENDOR_IBM=y
-CONFIG_IBMVETH=y
-CONFIG_HVC_CONSOLE=y
-
-# None of this should be necessary
-CONFIG_PPC_TRANSACTIONAL_MEM=y
-CONFIG_PPC_DISABLE_WERROR=y
-CONFIG_SECTION_MISMATCH_WARN_ONLY=y
-"
-elif [ "$TARGET" = s390x ]
-then
-  QEMU="qemu-system-s390x"
-  KARCH=s390
-  VMLINUX=arch/s390/boot/bzImage
-  KERNEL_CONFIG="
-CONFIG_MARCH_Z900=y
-CONFIG_PACK_STACK=y
-CONFIG_NET_CORE=y
-CONFIG_VIRTIO_NET=y
-CONFIG_VIRTIO_BLK=y
-CONFIG_SCLP_TTY=y
-CONFIG_SCLP_CONSOLE=y
-CONFIG_SCLP_VT220_TTY=y
-CONFIG_SCLP_VT220_CONSOLE=y
-CONFIG_S390_GUEST=y
-"
-elif [ "$TARGET" == sh4 ]
-then
-  QEMU="qemu-system-sh4 -M r2d -serial null -serial mon:stdio"
-  KARCH=sh
-  KARGS="console=ttySC1 noiotrap"
-  VMLINUX=arch/sh/boot/zImage
-  KERNEL_CONFIG="
-CONFIG_CPU_SUBTYPE_SH7751R=y
-CONFIG_MMU=y
-CONFIG_MEMORY_START=0x0c000000
-CONFIG_VSYSCALL=y
-CONFIG_SH_FPU=y
-CONFIG_SH_RTS7751R2D=y
-CONFIG_RTS7751R2D_PLUS=y
-CONFIG_SERIAL_SH_SCI=y
-CONFIG_SERIAL_SH_SCI_CONSOLE=y
-
-CONFIG_PCI=y
-CONFIG_NET_VENDOR_REALTEK=y
-CONFIG_8139CP=y
+write_miniconfig()
+{
+  # Generic options for all targets
+  KCGLOB=EARLY_PRINTK,BINFMT_ELF,BINFMT_SCRIPT,NO_HZ,HIGH_RES_TIMERS,BLK_DEV,BLK_DEV_INITRD,RD_GZIP,BLK_DEV_LOOP,EXT4_FS,EXT4_USE_FOR_EXT2,VFAT_FS,FAT_DEFAULT_UTF8,MISC_FILESYSTEMS,SQUASHFS,SQUASHFS_XATTR,SQUASHFS_ZLIB,DEVTMPFS,DEVTMPFS_MOUNT,TMPFS,TMPFS_POSIX_ACL,NET,PACKET,UNIX,INET,IPV6,NETDEVICES,NET_CORE,NETCONSOLE,ETHERNET
 
-CONFIG_PCI=y
-CONFIG_BLK_DEV_SD=y
-CONFIG_ATA=y
-CONFIG_ATA_SFF=y
-CONFIG_ATA_BMDMA=y
-CONFIG_PATA_PLATFORM=y
+  echo "# make ARCH=$KARCH allnoconfig KCONFIG_ALLCONFIG=$TARGET.miniconf"
+  echo "# make ARCH=$KARCH -j \$(nproc)"
+  echo "# boot $VMLINUX"
+  echo
+  echo "# CONFIG_EMBEDDED is not set"
+
+  # Expand list of =y symbols
+  for i in $KCGLOB $KCONF; do
+    echo "# architecture ${X:-independent}"
+    sed -E '/^$/d;s/([^,]*)($|,)/CONFIG_\1=y\n/g' <<< "$i"
+    X=specific
+  done
+  echo "$KERNEL_CONFIG"
+}
 
-CONFIG_BINFMT_ELF_FDPIC=y
-CONFIG_BINFMT_FLAT=y
+if [ -z "$LINUX" ] || [ ! -d "$LINUX/kernel" ]; then
+  echo 'No $LINUX directory, kernel build skipped.'
+else
 
+  # Which architecture are we building a kernel for?
+  [ -z "$TARGET" ] && TARGET="${CROSS_BASE/-*/}"
+  [ -z "$TARGET" ] && TARGET="$(uname -m)"
+
+  # Target-specific info in an (alphabetical order) if/else staircase
+  # Each target needs board config, serial console, RTC, ethernet, block device.
+
+  if [ "$TARGET" == armv5l ]; then
+
+    # This could use the same VIRT board as armv7, but let's demonstrate a
+    # different one requiring a separate device tree binary.
+    QEMU="arm -M versatilepb -net nic,model=rtl8139 -net user"
+    KARCH=arm KARGS="console=ttyAMA0" VMLINUX=arch/arm/boot/zImage
+    KCONF=CPU_ARM926T,MMU,VFP,ARM_THUMB,AEABI,ARCH_VERSATILE,ATAGS,DEPRECATED_PARAM_STRUCT,ARM_ATAG_DTB_COMPAT,ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND,SERIAL_AMBA_PL011,SERIAL_AMBA_PL011_CONSOLE,RTC_CLASS,RTC_DRV_PL031,RTC_HCTOSYS,PCI,PCI_VERSATILE,BLK_DEV_SD,SCSI,SCSI_LOWLEVEL,SCSI_SYM53C8XX_2,SCSI_SYM53C8XX_MMIO,NET_VENDOR_REALTEK,8139CP
+    KERNEL_CONFIG="CONFIG_SCSI_SYM53C8XX_DMA_ADDRESSING_MODE=0"
+    DTB=arch/arm/boot/dts/versatile-pb.dtb
+  elif [ "$TARGET" == armv7l ] || [ "$TARGET" == aarch64 ]; then
+    if [ "$TARGET" == aarch64 ]; then
+      QEMU="aarch64 -M virt -cpu cortex-a57"
+      KARCH=arm64 VMLINUX=arch/arm64/boot/Image
+    else
+      QEMU="arm -M virt" KARCH=arm VMLINUX=arch/arm/boot/zImage
+    fi
+    KARGS="console=ttyAMA0"
+    KCONF=MMU,ARCH_MULTI_V7,ARCH_VIRT,SOC_DRA7XX,ARCH_OMAP2PLUS_TYPICAL,ARCH_ALPINE,ARM_THUMB,VDSO,CPU_IDLE,ARM_CPUIDLE,KERNEL_MODE_NEON,SERIAL_AMBA_PL011,SERIAL_AMBA_PL011_CONSOLE,RTC_CLASS,RTC_HCTOSYS,RTC_DRV_PL031,NET_CORE,VIRTIO_MENU,VIRTIO_NET,PCI,PCI_HOST_GENERIC,VIRTIO_BLK,VIRTIO_PCI,VIRTIO_MMIO,ATA,ATA_SFF,ATA_BMDMA,ATA_PIIX,PATA_PLATFORM,PATA_OF_PLATFORM,ATA_GENERIC
+  elif [ "$TARGET" == i486 ] || [ "$TARGET" == i686 ] ||
+       [ "$TARGET" == x86_64 ] || [ "$TARGET" == x32 ]; then
+    if [ "$TARGET" == i486 ]; then
+      QEMU="i386 -cpu 486 -global fw_cfg.dma_enabled=false" KCONF=M486
+    elif [ "$TARGET" == i686 ]; then
+      QEMU="i386 -cpu pentium3" KCONF=MPENTIUMII
+    else
+      QEMU=x86_64 KCONF=64BIT
+      [ "$TARGET" == x32 ] && KCONF=X86_X32
+    fi
+    KARCH=x86 KARGS="console=ttyS0" VMLINUX=arch/x86/boot/bzImage
+    KCONF=$KCONF,UNWINDER_FRAME_POINTER,PCI,BLK_DEV_SD,ATA,ATA_SFF,ATA_BMDMA,ATA_PIIX,NET_VENDOR_INTEL,E1000,SERIAL_8250,SERIAL_8250_CONSOLE,RTC_CLASS
+  elif [ "$TARGET" == mips ] || [ "$TARGET" == mipsel ]; then
+    QEMU="mips -M malta" KARCH=mips KARGS="console=ttyS0" VMLINUX=vmlinux
+    KCONF=MIPS_MALTA,CPU_MIPS32_R2,SERIAL_8250,SERIAL_8250_CONSOLE,PCI,BLK_DEV_SD,ATA,ATA_SFF,ATA_BMDMA,ATA_PIIX,NET_VENDOR_AMD,PCNET32,POWER_RESET,POWER_RESET_SYSCON
+    [ "$TARGET" == mipsel ] && KCONF=$KCONF,CPU_LITTLE_ENDIAN &&
+      QEMU="mipsel -M malta"
+  elif [ "$TARGET" == powerpc ]; then
+    KARCH=powerpc QEMU="ppc -M g3beige" KARGS="console=ttyS0" VMLINUX=vmlinux
+    KCONF=ALTIVEC,PPC_PMAC,PPC_OF_BOOT_TRAMPOLINE,IDE,IDE_GD,IDE_GD_ATA,BLK_DEV_IDE_PMAC,BLK_DEV_IDE_PMAC_ATA100FIRST,MACINTOSH_DRIVERS,ADB,ADB_CUDA,NET_VENDOR_NATSEMI,NET_VENDOR_8390,NE2K_PCI,SERIO,SERIAL_PMACZILOG,SERIAL_PMACZILOG_TTYS,SERIAL_PMACZILOG_CONSOLE,BOOTX_TEXT
+  elif [ "$TARGET" == powerpc64le ]; then
+    KARCH=powerpc QEMU="ppc64 -M pseries -vga none" KARGS="console=/dev/hvc0"
+    VMLINUX=vmlinux
+    KCONF=PPC64,PPC_PSERIES,CPU_LITTLE_ENDIAN,PPC_OF_BOOT_TRAMPOLINE,BLK_DEV_SD,SCSI_LOWLEVEL,SCSI_IBMVSCSI,ATA,NET_VENDOR_IBM,IBMVETH,HVC_CONSOLE,PPC_TRANSACTIONAL_MEM,PPC_DISABLE_WERROR,SECTION_MISMATCH_WARN_ONLY
+  elif [ "$TARGET" = s390x ] ; then
+    QEMU="s390x" KARCH=s390 VMLINUX=arch/s390/boot/bzImage
+    KCONF=MARCH_Z900,PACK_STACK,NET_CORE,VIRTIO_NET,VIRTIO_BLK,SCLP_TTY,SCLP_CONSOLE,SCLP_VT220_TTY,SCLP_VT220_CONSOLE,S390_GUEST
+  elif [ "$TARGET" == sh4 ] ; then
+    QEMU="sh4 -M r2d -serial null -serial mon:stdio" KARCH=sh
+    KARGS="console=ttySC1 noiotrap" VMLINUX=arch/sh/boot/zImage
+    KERNEL_CONFIG="CONFIG_MEMORY_START=0x0c000000"
+    KCONF=CPU_SUBTYPE_SH7751R,MMU,VSYSCALL,SH_FPU,SH_RTS7751R2D,RTS7751R2D_PLUS,SERIAL_SH_SCI,SERIAL_SH_SCI_CONSOLE,PCI,NET_VENDOR_REALTEK,8139CP,PCI,BLK_DEV_SD,ATA,ATA_SFF,ATA_BMDMA,PATA_PLATFORM,BINFMT_ELF_FDPIC,BINFMT_FLAT
 #CONFIG_SPI=y
 #CONFIG_SPI_SH_SCI=y
 #CONFIG_MFD_SM501=y
-
 #CONFIG_RTC_CLASS=y
 #CONFIG_RTC_DRV_R9701=y
 #CONFIG_RTC_DRV_SH=y
 #CONFIG_RTC_HCTOSYS=y
-"
-else
-  echo "Unknown \$TARGET"
-  exit 1
-fi
-
-# Write the miniconfig file
-{
-  echo "# make ARCH=$KARCH allnoconfig KCONFIG_ALLCONFIG=$TARGET.miniconf"
-  echo "# make ARCH=$KARCH -j \$(nproc)"
-  echo "# boot $VMLINUX"
-  echo
-  echo "$KERNEL_CONFIG"
-
-  # Generic options for all targets
-
-  echo "
-# CONFIG_EMBEDDED is not set
-CONFIG_EARLY_PRINTK=y
-CONFIG_BINFMT_ELF=y
-CONFIG_BINFMT_SCRIPT=y
-CONFIG_NO_HZ=y
-CONFIG_HIGH_RES_TIMERS=y
-
-CONFIG_BLK_DEV=y
-CONFIG_BLK_DEV_INITRD=y
-CONFIG_RD_GZIP=y
-
-CONFIG_BLK_DEV_LOOP=y
-CONFIG_EXT4_FS=y
-CONFIG_EXT4_USE_FOR_EXT2=y
-CONFIG_VFAT_FS=y
-CONFIG_FAT_DEFAULT_UTF8=y
-CONFIG_MISC_FILESYSTEMS=y
-CONFIG_SQUASHFS=y
-CONFIG_SQUASHFS_XATTR=y
-CONFIG_SQUASHFS_ZLIB=y
-CONFIG_DEVTMPFS=y
-CONFIG_DEVTMPFS_MOUNT=y
-CONFIG_TMPFS=y
-CONFIG_TMPFS_POSIX_ACL=y
-
-CONFIG_NET=y
-CONFIG_PACKET=y
-CONFIG_UNIX=y
-CONFIG_INET=y
-CONFIG_IPV6=y
-CONFIG_NETDEVICES=y
-#CONFIG_NET_CORE=y
-#CONFIG_NETCONSOLE=y
-CONFIG_ETHERNET=y
-"
-} > "$OUTPUT/miniconfig-$TARGET"
-
-# Write the qemu launch script
-echo "$QEMU -nographic -no-reboot -m 256" \
-     "-append \"panic=1 HOST=$TARGET $KARGS\"" \
-     "-kernel $(basename "$VMLINUX") -initrd ${CROSS_BASE}root.cpio.gz" \
-     ${DTB:+-dtb "$(basename "$DTB")"} '"$@"' \
-     > "$OUTPUT/qemu-$TARGET.sh" &&
-chmod +x "$OUTPUT/qemu-$TARGET.sh" &&
-
-echo "Build linux for $KARCH"
-
-# Snapshot Linux source dir and clean it
-cp -sfR "$LINUX" "$MYBUILD/linux" && pushd "$MYBUILD/linux" > /dev/null ||
-  exit 1
+  else
+    echo "Unknown \$TARGET"
+    exit 1
+  fi
 
-# Build kernel
-make distclean &&
-make ARCH=$KARCH allnoconfig KCONFIG_ALLCONFIG="$OUTPUT/miniconfig-$TARGET" &&
-make ARCH=$KARCH CROSS_COMPILE="$CROSS_COMPILE" -j $(nproc) || exit 1
+  # Write the qemu launch script
+  echo "qemu-system-$QEMU" '"$@"' -nographic -no-reboot -m 256 \
+       "-kernel $(basename "$VMLINUX") -initrd ${CROSS_BASE}root.cpio.gz" \
+       "-append \"panic=1 HOST=$TARGET $KARGS \$KARGS\"" \
+       ${DTB:+-dtb "$(basename "$DTB")"} > "$OUTPUT/qemu-$TARGET.sh" &&
+  chmod +x "$OUTPUT/qemu-$TARGET.sh" &&
+
+  echo "Build linux for $KARCH"
+  cp -sfR "$LINUX" "$MYBUILD/linux" && pushd "$MYBUILD/linux" || exit 1
+  make distclean &&
+  write_miniconfig > "$OUTPUT/miniconfig-$TARGET" &&
+  make ARCH=$KARCH allnoconfig KCONFIG_ALLCONFIG="$OUTPUT/miniconfig-$TARGET" &&
+  make ARCH=$KARCH CROSS_COMPILE="$CROSS_COMPILE" -j $(nproc) || exit 1
+
+  # If we have a device tree binary, save it for QEMU.
+  if [ ! -z "$DTB" ]; then
+    cp "$DTB" "$OUTPUT/$(basename "$DTB")" || exit 1
+  fi
 
-# If we have a device tree binary, save it for QEMU.
-if [ ! -z "$DTB" ]
-then
-  cp "$DTB" "$OUTPUT/$(basename "$DTB")" || exit 1
+  cp "$VMLINUX" "$OUTPUT/$(basename "$VMLINUX")" && cd .. && rm -rf linux &&
+    popd || exit 1
 fi
 
-cp "$VMLINUX" "$OUTPUT/$(basename "$VMLINUX")" && cd .. && rm -rf linux &&
-  popd || exit 1
 rmdir "$MYBUILD" "$BUILD" 2>/dev/null
 
 # package root filesystem for initramfs.
-- 
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