Voipac at 13:25, 24 April 2022

2022-04-24T13:25:23Z

Voipac at 09:25, 23 October 2021

2021-10-23T09:25:25Z

Voipac at 23:26, 22 April 2021

2021-04-22T23:26:32Z

Voipac: Created page with "Category:i.MX25 SODIMM PC - Development kit
TOC
Altering and building Debian filesytem suitable for i.MX25 SODIMM PC - Develop..."

2021-04-22T23:24:51Z

Created page with "Category:i.MX25 SODIMM PC - Development kit  <div style="float:right">__TOC__</div> Altering and building Debian filesytem suitable for i.MX25 SODIMM PC - Develop..."

New page

[[Category:i.MX25 SODIMM PC - Development kit]]

<div style="float:right">__TOC__</div>

Altering and building Debian filesytem suitable for i.MX25 SODIMM PC - Development kit is shown in this section. Debian is a free operating system and an excellent choice for embedded solutions. More information about Debian project can be found on [https://www.debian.org/ the official website].

== Initial steps ==

=== Create working directory ===
<syntaxhighlight lang="bash">
mkdir -pv ~/workdir/vmx25/rootfs/debian7
cd ~/workdir/vmx25/rootfs/debian7
</syntaxhighlight>

=== Download installation files ===
<syntaxhighlight lang="bash">
wget http://ftp.debian.org/debian/dists/stable/main/installer-armel/current/images/versatile/netboot/initrd.gz
wget http://ftp.debian.org/debian/dists/stable/main/installer-armel/current/images/versatile/netboot/vmlinuz-3.2.0-4-versatile
</syntaxhighlight>

If these files are not available on the official path anymore, an alternate source from Debian server can be used:
<syntaxhighlight lang="bash">
wget https://people.debian.org/~aurel32/qemu/armel/initrd.img-3.2.0-4-versatile
wget https://people.debian.org/~aurel32/qemu/armel/vmlinuz-3.2.0-4-versatile
</syntaxhighlight>

== Install Debian into emulated machine ==
=== Create virtual HDD ===
<syntaxhighlight lang="bash">
qemu-img create -f raw ramdisk.img 2G
</syntaxhighlight>

=== Install Debian ===
<syntaxhighlight lang="bash">
qemu-system-arm -m 256 -machine versatileab \
-kernel vmlinuz-3.2.0-4-versatile \
-initrd initrd.gz \
-hda ramdisk.img -append "root=/dev/ram"
</syntaxhighlight>

== Extract installed filesystem ==
=== Find partition start offset ===
<syntaxhighlight lang="bash">
hexdump -C ramdisk.img | less

00000000 fa b8 00 10 8e d0 bc 00 b0 b8 00 00 8e d8 8e c0 |................|
00000010 fb be 00 7c bf 00 06 b9 00 02 f3 a4 ea 21 06 00 |...|.........!..|
00000020 00 be be 07 38 04 75 0b 83 c6 10 81 fe fe 07 75 |....8.u........u|
00000030 f3 eb 16 b4 02 b0 01 bb 00 7c b2 80 8a 74 01 8b |.........|...t..|
00000040 4c 02 cd 13 ea 00 7c 00 00 eb fe 00 00 00 00 00 |L.....|.........|
00000050 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
000001b0 00 00 00 00 00 00 00 00 0d 0e 07 00 00 00 80 20 |............... |
000001c0 21 00 83 f3 6f 04 00 08 00 00 00 f0 3f 00 00 00 |!...o.......?...|
000001d0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
000001f0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 55 aa |..............U.|
00000200 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
00100000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| << here starts first partition
*
00100400 00 00 02 00 00 fe 07 00 4c 66 00 00 74 cb 05 00 |........Lf..t...|
00100410 9c 97 01 00 00 00 00 00 02 00 00 00 02 00 00 00 |................|
</syntaxhighlight>

=== Copy the filesystem ===
<syntaxhighlight lang="bash">
mkdir -pv mount
mkdir -pv rootfs-debian7
sudo chown root:root rootfs-debian7
sudo mount -t ext4 -o loop,offset=1048576 ramdisk.img mount/
sudo cp -arvpf mount/* rootfs-debian7/
sudo umount mount/
</syntaxhighlight>

== Modifications ==
=== Remove persistent rules ===
<syntaxhighlight lang="bash">
sudo rm rootfs-debian7/etc/udev/rules.d/70-persistent*
sudo sed -i '/^#/!d' rootfs-debian7/etc/fstab
#sudo sed -i 's/iface eth0/#iface eth0/g' rootfs-debian7/etc/network/interfaces
</syntaxhighlight>

=== Enable serial console ===
<syntaxhighlight lang="bash">
sudo su

cat >> rootfs-debian7/etc/inittab << EOF
# VMX25 serial console
T0:2345:respawn:/sbin/getty -L ttymxc0 115200 vt100
EOF

exit
</syntaxhighlight>

=== Add valid nameservers ===
<syntaxhighlight lang="bash">
sudo su

cat > rootfs-debian7/etc/resolv.conf << EOF
domain example.org
search example.org
nameserver 8.8.8.8
nameserver 8.8.4.4
EOF

exit
</syntaxhighlight>

=== Disable some services ===
<syntaxhighlight lang="bash">
sudo su

sed -i 's/^test -x \/usr\/lib\/exim4\/exim4/test ! -x \/usr\/lib\/exim4\/exim4/' rootfs-debian7/etc/init.d/exim4

exit
</syntaxhighlight>

=== Add Voipac logo ===
<syntaxhighlight lang="bash">
sudo su

cat << EOF > rootfs-debian7/etc/logo.sh
#!/bin/sh

NORMAL="\\\\033[0;39m" # Standard console grey
SUCCESS="\\\\033[1;32m" # Success is green
WARNING="\\\\033[1;33m" # Warnings are yellow
FAILURE="\\\\033[1;31m" # Failures are red
INFO="\\\\033[1;36m" # Information is light cyan
BRACKET="\\\\033[1;34m" # Brackets are blue

ramt=\$(cat /proc/meminfo | grep MemTotal | awk '{print \$2}')
ramt=\$((ramt/1024))
ramf=\$(cat /proc/meminfo | grep MemFree | awk '{print \$2}')
ramf=\$((ramf/1024))

romt=\$(df -h | grep root | head -n1 | awk '{print \$2"B"}')
romf=\$(df -h | grep root | head -n1 | awk '{print \$4"B"}')

root=\$(mount | grep -v '^rootfs' | grep root | awk '{print \$5}')
ipaddr=\$(ifconfig eth0 | grep "inet addr" | cut -d ":" -f2 | cut -d " " -f1)

echo " _ "
echo -n " :_; "
echo " \$(cat /proc/cpuinfo | grep -i 'Hardware' | awk '{print \$1": "\$3" "\$4}')"
echo ".-..-. .--. .-..---. .--. .--. "
echo -n ": \\\`; :' .; :: :: .; \\\`' .; ; ' ..'"
printf " RAM:%06sMB FREE:%06sMB\n" \${ramt} \${ramf}
echo -n "\\\`.__.'\\\`.__.':_;: ._.'\\\`.__,_;\\\`.__.'"
printf " ROM:%08s FREE:%08s\n" \${romt} \${romf}
echo -n " : : "
echo " ROOT: \${SUCCESS}\${root}\${NORMAL}"
echo -n " :_; "
echo " IP: \${ipaddr}"
EOF
chmod a+x rootfs-debian7/etc/logo.sh
</syntaxhighlight>

<syntaxhighlight lang="bash">
sed -i '/^exit/d' rootfs-debian7/etc/rc.local
cat << EOF >> rootfs-debian7/etc/rc.local
# Voipac logo
. /etc/logo.sh
exit 0
EOF

exit
</syntaxhighlight>

=== Strip down filesystem even more ===
<syntaxhighlight lang="bash">
sudo cp -arvp rootfs-debian7 rootfs-debian7-tiny

sudo apt-get install qemu-user-static
sudo cp /usr/bin/qemu-arm-static rootfs-debian7-tiny/usr/bin
sudo chroot rootfs-debian7-tiny apt-get install localepurge
sudo chroot rootfs-debian7-tiny localepurge
#sudo chroot rootfs-debian7-tiny dpkg --get-selections
sudo chroot rootfs-debian7-tiny apt-get purge linux-image-versatile
sudo chroot rootfs-debian7-tiny apt-get purge linux-image-3.2.0-4-versatile
</syntaxhighlight>

== Final filesystem packages ==
=== NFS ===
<syntaxhighlight lang="bash">
sudo cp -arvpf rootfs-debian7/ /srv/nfs/rootfs-debian7-vmx25
/srv/nfs/rootfs-debian7-vmx25 *(rw,no_root_squash,no_all_squash,no_subtree_check,sync)
sudo exportfs -ra
</syntaxhighlight>

=== TAR ===
<syntaxhighlight lang="bash">
cd rootfs-debian7-tiny/
sudo tar cvJpf ../rootfs-debian7-nfs_vmx25_$(date "+%Y%m%d").tar.xz *
</syntaxhighlight>

@@ Line 14: / Line 14: @@
 === Download installation files ===
 <syntaxhighlight lang="bash">
-wget http://ftp.debian.org/debian/dists/stable/main/installer-armel/current/images/versatile/netboot/initrd.gz
+wget https://people.debian.org/~aurel32/qemu/armel/initrd.img-3.2.0-4-versatile
-wget http://ftp.debian.org/debian/dists/stable/main/installer-armel/current/images/versatile/netboot/vmlinuz-3.2.0-4-versatile
+wget https://people.debian.org/~aurel32/qemu/armel/vmlinuz-3.2.0-4-versatile
 </syntaxhighlight>
-If these files are not available in the official path anymore, an alternate source from Debian server can be used:
+The original path where these files were located on Debian server:
 <syntaxhighlight lang="bash">
-wget https://people.debian.org/~aurel32/qemu/armel/initrd.img-3.2.0-4-versatile
+# wget http://ftp.debian.org/debian/dists/stable/main/installer-armel/current/images/versatile/netboot/initrd.gz
-wget https://people.debian.org/~aurel32/qemu/armel/vmlinuz-3.2.0-4-versatile
+# wget http://ftp.debian.org/debian/dists/stable/main/installer-armel/current/images/versatile/netboot/vmlinuz-3.2.0-4-versatile
 </syntaxhighlight>

@@ Line 1: / Line 1: @@
-[[Category:i.MX25 SODIMM PC - Development kit]]
+[[Category:i.MX25 SODIMM PC - Development Kit]]
 <!-- -->
 <div style="float:right">__TOC__</div>
-Altering and building Debian filesytem suitable for i.MX25 SODIMM PC - Development kit is shown in this section. Debian is a free operating system and an excellent choice for embedded solutions. More information about Debian project can be found on [https://www.debian.org/ the official website].
+Altering and building Debian filesytem suitable for i.MX25 SODIMM PC - Development Kit is shown in this section. Debian is a free operating system and an excellent choice for embedded solutions. More information about Debian project can be found on [https://www.debian.org/ the official website].
 == Initial steps ==

i.MX25 SODIMM PC Debian - Revision history

Voipac at 13:25, 24 April 2022

Voipac at 09:25, 23 October 2021

Voipac at 23:26, 22 April 2021

Voipac: Created page with "Category:i.MX25 SODIMM PC - Development kit __TOC__ Altering and building Debian filesytem suitable for i.MX25 SODIMM PC - Develop..."

Voipac: Created page with "Category:i.MX25 SODIMM PC - Development kit
TOC
Altering and building Debian filesytem suitable for i.MX25 SODIMM PC - Develop..."