In certain situations, it is desirable for hostnames to be resolvable in
the initramfs (e.g., when a hostname is specified as the NFS server in
the "boot" or "disk" kernel parameters). If the network is up when the
init script is executed (e.g., when the "ip" kernel parameter is
specified) and a DNS server is known, write it to /etc/resolv.conf so it
can be used for DNS requests.
needs double space on storage partition for extracted .img file
KERNEL/SYSTEM files are copied directly from mounted partition to /flash
tested on imx6 project
size of initramfs/kernel increased by ~40kB
if downgrade with image without included .md5 files
user needs to create file .nocheck (there is no integrity
checks done in this case - can be unsafe)
### Checking for updates ###
Found new .tar archive. extracting...
Checking KERNEL.md5...
/storage/.update/KERNEL: OK
Checking SYSTEM.md5...
/storage/.update/SYSTEM: OK
Checking size: OK
### mount filesystem /flash/SYSTEM ... ###
### mount filesystem /storage/.update/SYSTEM ... ###
updating Kernel...
updating System...
### mount filesystem /flash/SYSTEM ... ###
updating Bootloader...
*** updating Device Tree Blob: imx6q-udoo.dtb ...
.................................................
*** updating u-boot image: /flash/u-boot.img ...
*** updating u-boot SPL Blob on: /dev/mmcblk0 ...
35+0 records in
35+0 records out
35840 bytes (35.0KB) copied, 0.050510 seconds, 692.9KB/s
System reboots now...
### Checking for updates ###
Found new .img.gz archive. extracting...
Mounting system partition...
Checking KERNEL.md5...
/storage/.update/.tmp/mnt/KERNEL: OK
Checking SYSTEM.md5...
/storage/.update/.tmp/mnt/SYSTEM: OK
Checking size: OK
updating Kernel...
updating System...
### mount filesystem /flash/SYSTEM ... ###
updating Bootloader...
*** updating Device Tree Blob: imx6dl-cubox-i.dtb ...
.....................................................
*** updating u-boot image: /flash/u-boot.img ...
*** updating u-boot SPL Blob on: /dev/mmcblk0 ...
35+0 records in
35+0 records out
35840 bytes (35.0KB) copied, 0.050320 seconds, 695.5KB/s
System reboots now...
### Checking for updates ###
Found new .img file...
Mounting system partition...
Checking KERNEL.md5...
/storage/.update/.tmp/mnt/KERNEL: OK
Checking SYSTEM.md5...
/storage/.update/.tmp/mnt/SYSTEM: OK
Checking size: OK
updating Kernel...
updating System...
### mount filesystem /flash/SYSTEM ... ###
updating Bootloader...
*** updating Device Tree Blob: imx6dl-cubox-i.dtb ...
.....................................................
*** updating u-boot image: /flash/u-boot.img ...
*** updating u-boot SPL Blob on: /dev/mmcblk0 ...
35+0 records in
35+0 records out
35840 bytes (35.0KB) copied, 0.050320 seconds, 695.5KB/s
System reboots now...