View source for IoTGateway/BSP/Linux/Debian/How to create Debian10 SDcard image

{{DISPLAYTITLE:How to create Debian 10 SD card image}}

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= Host Prerequisites =

== Debian 10 rootfs tarball ==

The environment variable ,ROOTFS, must be set properly. (Ref. [[IoTGateway/BSP/Linux/Debian/How_to_Create_Debian10_Rootfs_Base#keep_the_rootfs_for_future_use|keep the rootfs for future use]])

== Yocto Linux SD card image ==


<syntaxhighlight lang="bash">
SDIMAGE=5720A1AIM20LIV90100_iMX8M_2020-04-03.img # i.MX8 ROM-5720
SDIMAGE=3430A1LIV8940_DualQuad_2019-04-29.img # i.MX6 RSB-3430
</syntaxhighlight>
=== backup modules and firmware ===


<syntaxhighlight lang="bash">
BACKUPDIR=~/${SDIMAGE%%_*}
mkdir $BACKUPDIR
MNT=~/mnt
mkdir -p $MNT
PL=`fdisk -lu $SDIMAGE | grep "${SDIMAGE}2" | awk '{print $2}'`
sudo mount -o ro,offset=$((PL*512)) $SDIMAGE $MNT
sudo tar zcvf $BACKUPDIR/lib_modules.tgz -C $MNT lib/modules
sudo tar zcvf $BACKUPDIR/lib_firmware.tgz -C $MNT lib/firmware
sudo umount $MNT
</syntaxhighlight>
= Building Procedures =

== create one working image ==


<syntaxhighlight lang="bash">
DEBIMAGE=`sed "s/AIM20//; s/LIV/DIV/" <<< ${SDIMAGE%%_*}`_Debian10_base.img
cp $SDIMAGE $DEBIMAGE
mkfs.ext4 -F -E offset=$((PL*512)) $DEBIMAGE

</syntaxhighlight>
== restore rootfs ==


<syntaxhighlight lang="bash">
sudo mount -o offset=$((PL*512)) $DEBIMAGE $MNT
sudo tar zxvf $ROOTFS.tgz -C $MNT/
</syntaxhighlight>
== set hostname ==


<syntaxhighlight lang="bash">
HOST=RSB-3430 # for RSB-3430
HOST=ROM-5720 # for ROM-5720
sudo su -c "echo $HOST > $MNT/etc/hostname"
sudo su -c "echo -e \"127.0.0.1\tlocalhost\n127.0.1.1\t$HOST\n\" > $MNT/etc/hosts"
</syntaxhighlight>
== restore modules & firmware ==


<syntaxhighlight lang="bash">
sudo tar zxvf $BACKUPDIR/lib_modules.tgz -C $MNT
sudo tar zxvf $BACKUPDIR/lib_firmware.tgz -C $MNT
sudo umount $MNT
</syntaxhighlight>
= SDcard image is ready =

== write to SD card ==

The environment variable ,SD_DEVICE, must be set properly.
<syntaxhighlight lang="bash">
sudo dd if=$DEBIMAGE of=${SD_DEVICE} bs=1M conv=fsync status=progress
</syntaxhighlight>