Forgot to add the files from the previous commit.

There are few helper .sh files for "qemu".

src/.config

@@ -2,11 +2,11 @@
 #
 # http://kernel.org
 #
-KERNEL_SOURCE_URL=https://www.kernel.org/pub/linux/kernel/v3.x/linux-3.18.6.tar.xz
+KERNEL_SOURCE_URL=https://www.kernel.org/pub/linux/kernel/v4.x/linux-4.0.tar.xz
 
 # You can find the latest BusyBox source bundles here:
 #
 # http://busybox.net
 #
-BUSYBOX_SOURCE_URL=http://busybox.net/downloads/busybox-1.23.1.tar.bz2
+BUSYBOX_SOURCE_URL=http://busybox.net/downloads/busybox-1.23.2.tar.bz2
 

src/2_build_kernel.sh

@@ -14,11 +14,10 @@ make defconfig
 # Changes the name of the system
 sed -i "s/.*CONFIG_DEFAULT_HOSTNAME.*/CONFIG_DEFAULT_HOSTNAME=\"minimal\"/" .config
 
-# Compile the kernel
+# Compile the kernel with optimization for "parallel jobs" = "number of processors"
 # Good explanation of the different kernels
 # http://unix.stackexchange.com/questions/5518/what-is-the-difference-between-the-following-kernel-makefile-terms-vmlinux-vmlinux
-# TODO - Suggested by Ronny Kalusniok - test this for parallel compilation: "make bzImage -j $(grep ^processor /proc/cpuinfo)".
+make bzImage -j $(grep ^processor /proc/cpuinfo | wc -l)
-make bzImage
 
 cd ../../..
 

src/4_build_busybox.sh

@@ -15,9 +15,15 @@ make defconfig
 # You could do this manually with 'make menuconfig'
 sed -i "s/.*CONFIG_STATIC.*/CONFIG_STATIC=y/" .config
 
-# Compile busybox
+# Busybox has "RPC networking" enabled in default configuration file.
-# TODO - Suggested by Ronny Kalusniok - test this for parallel compilation: "make busybox -j $(grep ^processor /proc/cpuinfo)".
+# In glibc > 2.14 such support was removed by default.
-make busybox
+# http://lists.busybox.net/pipermail/buildroot/2012-June/055173.html
+# It causes failures on glibc toolchains without RPC support.
+sed -e 's/.*CONFIG_FEATURE_HAVE_RPC.*/CONFIG_FEATURE_HAVE_RPC=n/' -i .config
+sed -e 's/.*CONFIG_FEATURE_INETD_RPC.*/CONFIG_FEATURE_INETD_RPC=n/' -i .config
+
+# Compile busybox with optimization for "parallel jobs" = "number of processors"
+make busybox -j $(grep ^processor /proc/cpuinfo | wc -l)
 
 # Create the symlinks for busybox
 # It uses the file 'busybox.links' for this

src/5_generate_rootfs.sh

@@ -31,10 +31,27 @@ mount -t devtmpfs none /dev
 mount -t proc none /proc
 mount -t sysfs none /sys
 
+ip link set lo up
+ip link set eth0 up
+udhcpc -b -i eth0 -s /etc/rc.dhcp
+
 EOF
 
 chmod +x bootscript.sh
 
+cat > rc.dhcp << EOF
+#!/bin/sh
+
+ip addr add \$ip/\$mask dev \$interface
+
+if [ -n "$router"]; then
+  ip route add default via \$router dev \$interface
+fi
+
+EOF
+
+chmod +x rc.dhcp
+
 cat > welcome.txt << EOF
 
   #####################################

src/7_generate_iso.sh

@@ -8,7 +8,9 @@ cd $(ls -d *)
 # Edit Makefile to look for genisoimage instead of mkisofs
 sed -i 's/mkisofs/genisoimage/g' arch/x86/boot/Makefile
 
-make isoimage FDINITRD=../../rootfs.cpio.gz
+# Generate the ISO image with optimization for "parallel jobs" = "number of processors"
+make isoimage FDINITRD=../../rootfs.cpio.gz -j $(grep ^processor /proc/cpuinfo | wc -l)
+
 cp arch/x86/boot/image.iso ../../../minimal_linux_live.iso
 
 cd ../../..