Making Progress, Custom Boot Logos at least...
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Using the platform tools you can upload custom logo.bin to the logo partition.
Boot Scope into FEL mode by holding the button underneath at power on.
Connect to PC with zadig-2.5 WINUSB driver loaded to support connections to the Allwinner in FEL mode.
sunxi-fel.exe uboot images/uboot_fb.bin Boot the Scope into a basic Fastboot mode, the screen backlight should come on, some random color lines may appear on the screen.
fastboot flash logo images/logo3.bin This line flashes the Logo into the LOGO partition
fastboot reboot Reboot the scope and load the operating system.
You can copy the existing logo3.bin found in the Platform-tools\images folder, rename it to logoTEST.raw
This raw image file can be loaded into a photo editing program that supports opening raw images. In this case I used Corel Paint Shop Pro to open the RAW image.
Import settings were 1600 Width x 480 Height, Single Channel Greyscale, Interleaved, RGB Order
If you call the TESTLOGO
.DATA then GIMP (GNU Image Manipulation Program) will basically do the same thing.
Once you edit the LogoTEST.raw and save the file, rename it back to a logoTEST.bin file of your choosing, then upload it to to logo partition on the scope.
FEL Mode -> Load Fastboot as above -> fastboot.exe flash logo images\logoTEST.bin
Results are still Work in progress, trying to figure out REAL size and data format. Likely may need to custom written a converter to properly support full color images. Works alright if you stick to Generally high contrast Black and White images till we figure out the exact format of that logo .bin file.
That images\logo.bin file is a curious one, at a RAW resolution of 320x800 Greyscale Interleaved RGB, and Rotated upside down... Anyone heard of FOX? I don't recognize the logo in that file.