How to create the img file to use with etcher once you build the android SDK?

[octavian]

How do we construct the single .img file like the one that is distrIibuted on the wiki after we build the Android ROM?

I found these steps for flashing:

rkdeveloptool is here: http://opensource.rock-chips.com/wiki_Rkdeveloptool
Get the board into bootrom mode. Short the two pins next to the LEDs and hit reset.

Code:

cd rockdev/Image-rk3328_box
rkdeveloptool db MiniLoaderAll.bin
rkdeveloptool ef
rkdeveloptool gpt parameter.txt
rkdeveloptool ppt
rkdeveloptool ul MiniLoaderAll.bin
rkdeveloptool wlx uboot uboot.img
rkdeveloptool wlx trust trust.img
rkdeveloptool wlx misc misc.img
rkdeveloptool wlx baseparameter baseparameter.img
rkdeveloptool wlx resource resource.img
rkdeveloptool wlx kernel kernel.img
rkdeveloptool wlx dtbo dtbo.img
rkdeveloptool wlx vbmeta vbmeta.img
rkdeveloptool wlx boot boot.img
rkdeveloptool wlx recovery recovery.img
rkdeveloptool wlx system system.img
rkdeveloptool wlx vendor vendor.img
rkdeveloptool wlx oem oem.img
rkdeveloptool rd

I believe the tool you're looking for is located in `$SDK_ROOT/RKTools/Linux/Linux_Pack_Firmware`.
Reading the `mkupdate.sh` script, it seems to be doing exactly that. Not sure how the OTA packages for install in recovery are created, but those should have a .zip extension.