From 282f805d6dcad5390aed7486aa70c930a7e56eb3 Mon Sep 17 00:00:00 2001
From: Andreas Grapentin <andreas@grapentin.org>
Date: Wed, 27 Dec 2017 17:08:03 +0100
Subject: [PATCH] initial commit - working archlinuxarm boot for versatile
 express emulation

---
 .gitignore |  7 ++++++
 create.sh  | 64 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 start.sh   | 25 +++++++++++++++++++++
 3 files changed, 96 insertions(+)
 create mode 100644 .gitignore
 create mode 100755 create.sh
 create mode 100755 start.sh

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ef6b600
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,7 @@
+
+# image files
+*.qcow2
+*.raw
+
+# tarballs
+*.tar.*
diff --git a/create.sh b/create.sh
new file mode 100755
index 0000000..e509b86
--- /dev/null
+++ b/create.sh
@@ -0,0 +1,64 @@
+#!/bin/bash
+
+set -eu
+
+# this script prepares an archlinuxarm image for use with start.sh
+
+OUTFILE=${OUTFILE:-armv7h.raw}
+SIZE=${SIZE:-64G}
+
+_builddir=build
+_outfile=$_builddir/$(basename $OUTFILE)
+
+mkdir -p $_builddir
+
+# create an empty image
+rm -f $_outfile
+qemu-img create -f raw $_outfile $SIZE
+
+# setup an available loop device
+_loopdev=$(losetup -f --show $_outfile)
+
+# setup an error exit handler for cleanup
+function cleanup {
+  echo "exiting due to earlier errors..." >&2
+  for part in p1 p2; do
+    umount $_loopdev$part || true
+  done
+  losetup -d $_loopdev || true
+  rm -rf $_builddir/boot $_builddir/root
+  rm -f $_outfile
+}
+trap cleanup ERR
+
+# fetch latest archlinuxarm tarball
+wget -nc http://os.archlinuxarm.org/os/ArchLinuxARM-armv7-latest.tar.gz
+
+# following are the installation instructions provided on
+# https://archlinuxarm.org/platforms/armv7/arm/versatile-express
+dd if=/dev/zero of=$_loopdev bs=1M count=8
+parted -s $_loopdev \
+  mklabel gpt \
+  mkpart ESP fat32 1MiB 513MiB \
+  set 1 boot on \
+  mkpart primary ext4 513MiB 100%
+mkfs.vfat -F 32 ${_loopdev}p1
+mkdir -p $_builddir/boot
+mount ${_loopdev}p1 $_builddir/boot
+mkfs.ext4 ${_loopdev}p2
+mkdir $_builddir/root
+mount ${_loopdev}p2 $_builddir/root
+bsdtar -vxpf ArchLinuxARM-armv7-latest.tar.gz -C $_builddir/root
+sync
+mv -v $_builddir/root/boot/* $_builddir/boot
+cat >> $_builddir/root/etc/fstab << EOF
+/dev/mmcblk0p1  /boot   vfat    defaults        0       0
+EOF
+
+# tie up any loose ends
+for part in p1 p2; do
+  umount $_loopdev$part
+done
+losetup -d $_loopdev
+mv -v $_outfile $OUTFILE
+rm -rf $_builddir
diff --git a/start.sh b/start.sh
new file mode 100755
index 0000000..8e1bcfb
--- /dev/null
+++ b/start.sh
@@ -0,0 +1,25 @@
+#!/bin/bash
+
+IMAGE=${IMAGE:-armv7h.raw}
+
+_loopdev=$(sudo losetup -f --show $IMAGE)
+_bootdir=.boot
+
+function cleanup {
+  sudo umount ${_loopdev}p1
+  sudo losetup -d $_loopdev
+  rm -rf $_bootdir
+}
+trap cleanup EXIT
+
+mkdir -p $_bootdir
+sudo mount ${_loopdev}p1 $_bootdir
+
+qemu-system-arm \
+  -M vexpress-a9 \
+  -dtb $_bootdir/dtbs/vexpress-v2p-ca9.dtb \
+  -kernel $_bootdir/zImage \
+  --append "root=/dev/mmcblk0p2 rw roottype=ext4 console=ttyAMA0" \
+  -drive if=sd,driver=raw,cache=writeback,file=$IMAGE \
+  --nographic \
+  -snapshot