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mkdns323fw - build firmware images for the DNS-323 from a kernel and initrd




mkdns323fw creates firmware images suitable for upload to the D-link DNS-323 and other,
similar devices based on the same basic firmware image, such as the Conceptronics CH3SNAS.
These firmware images contain a kernel and initrd, as well as various product-specific
values and checksums.

This command can be very dangerous; although it attempts to do some very, very basic
sanity checking, it is still quite easy to generate a firmware file that, when loaded into
your device, will kill it stone dead. This program is not able to check that you're
uploading valid data to your device; if you brick it, you're on your own.

-k kernel, --kernel=kernel

specify the file containing the kernel image to embed in the firmware image. This
must be a uBoot image file, as produced by mkimage(1) with appropriate options to
specify it as a kernel image. Attempts to provide a non-uBoot file will fail,
while specifying a non-kernel uBoot file may well brick your device. This option
is required.

-i initrd, --initrd=initrd

the initrd file to embed in the firmware image. This must be a uBoot image file,
as produced by mkimage(1) with appropriate options to specify it as a ramdisk. The
tool will refuse to embed a non-uBoot file, however a dodgy ramdisk will likely
brick your device.

-d defaults.tar.gz, --defaults=defaults.tar.gz

The firmware format has the ability to embed a tarball with a default
configuration; if you want to do this, you may use this option to do so. However,
the devices that the author has dealt with do not require such a thing, and leaving
it out still produces a valid firmware (and one that is a bit smaller, to boot).

-s signature, --defaults=signature

For reasons that will probably remain unknown until the ends of time, there are (at
least) two different firmware signatures running around that are otherwise
identical in their internal structure, which are used for different devices. This
option exists to allow you to specify the signature that you want to use in your
firmware build. Valid values for this option are currently FrodoII ®(the default
if this option is not specified), Chopper ®or Gandolf ®which is used in some
devices. See the table at the top of the script if you don't know which value to
use for your device.

--p product_id, --product-id=product_id

--c custom_id, --custom-id=custom_id

--m model_id, --model-id=model_id

Specify the product, custom, and model ID that this firmware image is intended for.
As several different devices share the same firmware format, the intended device
type is encoded in these fields. If you do not specify the correct values for the
device that you are targetting with your firmware, it is quite likely that the
device will refuse the upload.

Known-good values for various devices are provided in the header of the script;
please look there for more information. You can also obtain the values you need by
downloading an existing firmware for the device you're targetting and doing a bit
of digging.

-o outputfile, --output=outputfile

Where to write the completed firmware image. Will overwrite any existing file of
the same name.

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