I have an original, white, 4 GB, Dingoo Digital A320 from China (S.N. A320WH0160373)
with native firmware Version 1.20
I was unable, after many tries, to upgrade to the official 1.22, 1.30 or to other
firmwares with the "DOWN button pressed while starting-up" method, haven't tried the
USB method though as I'm not on Windows but Linux Ubuntu (and I'm fine with 1.20).
Maybe I'll try another time, so I could boot Dingux, but so far programming for the
native Dingoo's OS looks more like I would rather do. I have a number of software
and hardware-hack projects in the back of my head since I got my Dingoo in Dec. 2010.
The "secret message" of my LCD-test-screen is:
Vendor ID: 0x 1be1369.
LCD MODULE: LCM_MODULE_ILI9325
LOADER SUM: 0x 90614d.
OS SUM: 0x a2d83c8.
OS?汾: Sep 25 2009 09:26:15
With the nice and well done CPU-and-Memory-clocks-overclocker APP, I could overclock
safely at 440 MHz (CPU) / 146 MHz (Memory), but 448 and above freezes the A320.
Underclocking, on the the other hand, freezes with this APP with anything bellow 335.
With another dedicated 200 MHz (CPU) APP (wihout any display), I can change the clocks
and now the first APP shows 198 MHz (CPU) / 66 MHz (Memory), and everything works fine
but slow (I use that to slow down fighting games when bosses are too fast for me ;-)
and to save some power while using my A320 as an e-book reader).
I have seen the A320 underclocking-itself without any warning for the user when the
battery power is low.
Also I'll post here a little info about CPU and Memory clocks frequencies:
I found that their values (I think there are dedicated registers for them) are reseted
to default whe quitting an APP (or a SIM) unless: - I am pressing a button constantly
while quitting and navigating the menus (I use the Y button for that because it doesn't
disturb navigation), OR - I am not running on the battery but from USB +5 V power.
P.S. I'd like to say I'm very thankful for the whole effort of the Dingoo community and
I'm a little bit sorry of Dingoo Digital's fate ... long live homebrew and retro games !