Vnx-rootfs-uml-kernel

How to create a User-Mode-Linux Kernel for VNX

This document describes how to create a UML kernel to be used with VNX.

• Download and uncompress kernel sources:

wget http://www.kernel.org/pub/linux/kernel/v3.x/linux-3.3.8.tar.gz
tar xfvz linux-3.3.8.tar.gz
cd linux-3.3.8

• Download mconsole exec kernel patch:

wget vnx.dit.upm.es/vnx/kernels/mconsole-exec-3.3.8.patch

• Apply mconsole-exec patch:

patch -p1 < mconsole-exec-3.3.8.patch

• Configure kernel options (do not forget to enable support in kernel for ISO9660 and EXT4 file system format support):

make defconfig ARCH=um SUBARCH=i386
make menuconfig ARCH=um SUBARCH=i386

• Compile the kernel

make ARCH=um SUBARCH=i386
strip linux

• Check the kernel having a look at the version and options:

./linux --version
./linux --showconfig

• Create tar file for distribution:

mkdir linux-3.3.8-um-src
cp linux linux-3.3.8-um-src/linux-3.3.8-um
mkdir linux-3.3.8-um-src/modules
make modules_install INSTALL_MOD_PATH=linux-3.3.8-um-src/modules/ ARCH=um SUBARCH=i386
cd linux-3.3.8-um-src/modules/lib/modules/
tar cfv modules-3.3.8.tar 3.3.8
mv modules-3.3.8.tar ../../../
cd ../../../
rm -rf modules
vi README-linux-3.3.8-um
cp ../.config config-linux-3.3.8-um
cd ..
tar cfvz linux-3.3.8-um.tgz linux-3.3.8-um-src