Pulled out my soldering iron, soldered a reset button and a switch to boot into recovery on the PCB and connected my UG802 clone/revision to my TV. Nothing. lsusb. Crap, it boots in flash mode. Let’s try reflashing the whole bloody thing. Well that works so the NAND is not defective or anything. Reboot. Nothing, lsusb still reports the device is in flash mode. So I removed all my soldering efforts which I really regretted because it was quite nicely done given my poor soldering skills and tried again. Still nothing. Arrrggghhhh. Enjoyed a cold Warsteiner and let it rest.
Today I brought the device with me to the office. Hooked it up to a Windows machine, ran the ROM flash tool from Finless’ custom ROM package for this device and powered it up. I was greeted with the most ugly Android boot animation I had ever seen. But at least the device works again so thanks Finless!
So now I can move on again. I had Jack1 running on it so it should be possible to turn this device into a very cheap, yet powerful alternative to do real-time, low-latency audio. Compared to the Raspberry Pi JACK already consumed way less CPU (12% on the RPi compared to 2% on the RK3066 device with the same JACK settings) and I noticed the device has some more IRQ’s so if I could get all of those threaded that should give me some more flexibility to get everything working in a more stable way. I did have to disable WiFi otherwise the whole USB stack crashed after starting JACK. Also tried with an external WiFi dongle, same issue. I can even generate xruns when pressing keys on an attached keyboard. So it’d be really nice if I had serial console access to this thing. But I’ll figure that out too. And maybe the USB part of the kernel can be tweaked to improve things on the USB level.
