Rockchip Provide Tools for Upgrade firmware to on board storage media like eMMC/NAND/SPI flash.
Please chose a appropriate tool for your project.
|Upgrade_tool||Rockchip||N||Rockchip official release with in SDK, Linux vesion|
|rkdeveloptool||Rockchip||Y||open source version of upgrade_tool|
|rkflashtool||Community||Y||open source, maintained by third party|
|Android Tool||Rockchip||N||official release within SDK, Windows Only|
If you are using a SD card for firmware storage, then you don't need the Tool for firmware upgrade, for example, you can use 'dd' command in Linux OS.