501 changes: 115 additions & 386 deletions scripts/mkroot.sh
View file
Original file line number Diff line number Diff line change
Expand Up @@ -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
Expand All @@ -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 ${CROSS_COMPILE}cc in path" >&2
exit 1
fi
Expand All @@ -45,10 +40,8 @@ MYBUILD="$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= \
Expand All @@ -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
Expand All @@ -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
Expand All @@ -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" ] &&
Expand All @@ -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.
Expand Down