Subversion Repositories amber

File in this directory:

initrd                      A disk image needed if you want to build the

                            Amber Linux kernel from sources

patch-2.4.27-amber2.bz2     Amber Linux patch file

patch-2.4.27-vrs1.bz2       ARM Linux patch file

README.txt                  This file

vmlinux.dis                 Kernel disassembly file

vmlinux.mem                 Kernel .mem file for Verilog simulations

                            If you build the kernal from source these 2 files

                            get replaced.

# +++++++++++++++++++++++++++++++++++++++++++

# How to build Amber Linux kernel from source

# +++++++++++++++++++++++++++++++++++++++++++

# If you also want to create your own initrd disk image,

# then follow that procedure (below) first.

# Set the location on your system where the Amber project is located

export AMBER_BASE=/proj/opencores-svn/trunk

# Pick a directory on your system where you want to build Linux

export LINUX_WORK_DIR=/proj/amber2-linux

export AMBER_CROSSTOOL=arm-none-linux-gnueabi

# Create the Linux build directory

test -e ${LINUX_WORK_DIR} || mkdir ${LINUX_WORK_DIR}

cd ${LINUX_WORK_DIR}

# Download the kernel source

wget http://www.kernel.org/pub/linux/kernel/v2.4/linux-2.4.27.tar.gz

tar zxf linux-2.4.27.tar.gz

ln -s linux-2.4.27 linux

cd linux

#Apply 2 patch files

cp ${AMBER_BASE}/sw/vmlinux/patch-2.4.27-vrs1.bz2 .

cp ${AMBER_BASE}/sw/vmlinux/patch-2.4.27-amber2.bz2 .

bzip2 -d patch-2.4.27-vrs1.bz2

bzip2 -d patch-2.4.27-amber2.bz2

patch -p1 < patch-2.4.27-vrs1

patch -p1 < patch-2.4.27-amber2

# Build the kernel and create a .mem file for simulations

make dep

make vmlinux

cp vmlinux vmlinux_unstripped

${AMBER_CROSSTOOL}-objcopy -R .comment -R .note vmlinux

${AMBER_CROSSTOOL}-objcopy --change-addresses -0x02000000 vmlinux

$AMBER_BASE/sw/tools/amber-elfsplitter vmlinux > vmlinux.mem

# Add the ram disk image to the .mem file

$AMBER_BASE/sw/tools/amber-bin2mem ${AMBER_BASE}/sw/vmlinux/initrd 800000 >> vmlinux.mem

${AMBER_CROSSTOOL}-objdump -C -S -EL vmlinux_unstripped > vmlinux.dis

cp vmlinux.mem $AMBER_BASE/sw/vmlinux/vmlinux.mem

cp vmlinux.dis $AMBER_BASE/sw/vmlinux/vmlinux.dis

# Run the Linux simulation to verify that you have a good kernel image

cd $AMBER_BASE/hw/sim

run vmlinux

# +++++++++++++++++++++++++++++++++++++++++++

# How to create your own initrd file

# +++++++++++++++++++++++++++++++++++++++++++

This file is the disk image that Linux mounts as

part of the boot process. It contains a bare bones Linux directory

structure and an init file (which is just hello-world renamed).

# Set the location on your system where the Amber project is located

export AMBER_BASE=/proj/opencores-svn/trunk

# Pick a directory on your system where you want to build Linux

export LINUX_WORK_DIR=/proj/amber2-linux

cd ${LINUX_WORK_DIR}

# Need root permissions to mount disks

su root

dd if=/dev/zero of=initrd bs=200k count=1

mke2fs -F -m0 -b 1024 initrd

mkdir mnt

mount -t ext2 -o loop initrd ${LINUX_WORK_DIR}/mnt

# Add files

mkdir ${LINUX_WORK_DIR}/mnt/sbin

mkdir ${LINUX_WORK_DIR}/mnt/dev

mkdir ${LINUX_WORK_DIR}/mnt/bin

mkdir ${LINUX_WORK_DIR}/mnt/etc

mkdir ${LINUX_WORK_DIR}/mnt/proc

mkdir ${LINUX_WORK_DIR}/mnt/lib

mknod ${LINUX_WORK_DIR}/mnt/dev/console c 5 1

mknod ${LINUX_WORK_DIR}/mnt/dev/tty2 c 4 2

mknod ${LINUX_WORK_DIR}/mnt/dev/null c 1 3

mknod ${LINUX_WORK_DIR}/mnt/dev/loop0 b 7 0

chmod 600 ${LINUX_WORK_DIR}/mnt/dev/*

cp $AMBER_BASE/sw/hello-world/hello-world.elf ${LINUX_WORK_DIR}/mnt/sbin/init

chmod +x ${LINUX_WORK_DIR}/mnt/sbin/init

# Check

df ${LINUX_WORK_DIR}/mnt

# Unmount

umount ${LINUX_WORK_DIR}/mnt

exit

cp initrd $AMBER_BASE/sw/vmlinux