Firmware file format (.gdf)

File format byte by byte

All multibyte integers are stored LSB first.

GDF version 300

Header

IDString - 4 bytes, always="GDFW"

BLFileVersion - 2 bytes, value=300

TargetDriveType - 2 bytes, Argon=4000, Ion=11000, Atomi=14000

HostFWbytes - 4 bytes, number of bytes for STM32 CPU

GCFWbytes - 4 bytes, number of bytes for GraniteCore CPU or 0xffffffff if not included

Data

Data of HostFW begins. Amount of bytes is HostFWbytes

Data of GCFW begins. Amount of bytes is GCFWbytes

File checksum

FileCksum - 4 bytes calculated from the current file. Simply sum of all unsigned bytes in file except CKSum itself

GDF version 400 - draft

Header

Version 400 described below:

        /* GDF version 400 format
         * ----------------------
         *
         * Note: GDF v400 is not limited to firmware files any more,
         * it can be used as general purpose data container for up to 4GB data chunks.
         *
         * Binary file contents
         * --------------------
         *
         * bytes  meaning:
         *
         * 4	ASCII string = "GDFW"
         * 2	GDF version = 400
         * 2	GDF backwards compatible version = 400
         * 4	number of data chunks in file = N
         *
         * repeat N times:
         * 4	data chunk descriptive name string length in bytes = L
         * L	data chunk descriptive name string in UTF8
         * 4	data chunk type
         * 4	data chunk option bits
         * 4	data chunk size in bytes=S
         * S	data
         * end of repeat
         *
         * 4	file's CRC-32
         *
         * data chunk types
         * ----------------
         * 0=target device name, UTF8
         * 1=firmware name, UTF8
         * 2=firmware version string, UTF8
         * 3=remarks, UTF8
         * 4=manufacturer, UTF8
         * 5=copyright, UTF8
         * 6=license, UTF8
         * 7=disclaimer, UTF8
         * 8=circulation, UTF8 (i.e. customer name)
         * 20=unix timestamp, S=4
         * 50=target device type ID and mask, S=8
         *   first 4 bytes are target device ID, i.e. 11000=IONI
         *   second 4 bytes are mask/divider for type comparison, must be >0
         *   file is compatible if following eq is true: floor(readID/divider) == floor(targetID/divider)
         * 100=main MCU FW binary, S=any
         * 101=main MCU FW unique identifier number, S=4
         * 102=main MCU FW required HW feature bits, S=4
         *     helps to determine whether FW works on target
         *     device version when compared to a value readable from the device.
         *     0 means no requirements, works on all target ID devices.
         * 200=secondary MCU FW binary, S=any
         *
         * note: firmware may contain many combinations of above chunks. in basic case, it contains just chunk type 100 and nothing else.
         *
         * data chunk option bits
         * ----------------------
         * bit 0: if 1, GDF loading application must support/understand the chunk type to use this file
         * bits 1-31: reserved
         *
         */

For practical reading software implementation, see devicedeployment.c from SimpleMotion library.

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