Booboo has released a new version of his Dual Boot app for the Dingoo, heres the release notes:
I didn't noticed this bug because as you know I modified my A320 and attached a serial port converter. Today I was playing around with it and noticed the problem.
It turns out that the Ingenic provided function to initialize the UART disables the pull-up resistors of the TX and RX pins. That means that the RX pin is left floating if not connected to an external circuit (which is the case of ALL of you). U-Boot listens to the serial port for commands, and if it detects a break condition or some other input, it stops the boot process and waits for further commands, which never arrive. The fix is as simple as leaving the pull-ups enabled.
I am sorry for not detecting this earlier. Please upgrade your dual boot.
Also, I made a couple of "aestetic" changes as suggested by someone: no more "white screens" while loading. The "white screen" glitch is caused by the LCD initialization code both in the original firmware system loader and in the linux framebuffer driver. Normally you should not see this white screen because the LCD backlight should be off. However the dual boot SPL shows the splash screen and leaves the LCD backlight on.
The original firmware case is solved by switching the backlight off just before jumping into the system loader. The system loader quickly initializes the LCD, so you'll see a black screen only for a split second.
However, in linux I cannot do that because it takes significantly longer for the framebuffer driver to kick in, so it's better to leave the LCD on. But here, as opposed to the original firmware, we have the sources. The solution has been just to always switch the backlight off before performing the LCD initialization in the framebuffer driver.
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