Hi Armbian community
I have a Giada DN74 media player and would like to install Armbian on the box.
First I try (through SD card) some community maintained images like the Orange Pi RK3399 or the Firefly RK3399, but none of them worked.
Some google search teach me the Rockchip SoCs have fixed boot order (SPI->eMMC->SD card), and this cause my boot issue.
Then search again how boot from SD card, the only solution which I find is to erase eMMC, so I erase the eMMC using: "rkdeveloptool ef".
Unfortunately the box still not want to boot, so I open the box and try to identify the UART to see what is happening during the boot.
I find a 4 pin connector (see images) which I assume this is the UART console, have a label "MCU_D" (Micro Controller Units Debug?) and have 3,3V on first pin and GND on the last pin. I try to use this connector whit some USB-to-UART (PL2303 and FT232RL) with multiple baud rate (115200, 1500000) without output.
At this point was able still connect the box through USB and recover Android because MaskRom mode work fine.
After some reading on https://opensource.rock-chips.com/wiki_Boot_option I deiced to build u-boot using evb-rk3399_defconfig and flash to the eMMC (which wan was a big mistake).
I assume the box is try to boot from eMMC, but stuck there because is only u-boot on the eMMC nothing else.
Unfortunately still no UART output (maybe is not UART connector) but also no Maskrom mode.
If I understand right jock guide Unbrick Part, the only option to recover the box if I short EMMC CLK pin to GND.
So my question is somebody could help me identify the eMMC CLK pin?
Some extra info:
According the rk3399 hardware design guide, I need to find a 22 ohm resistor near to the CLK pin.
The eMMC is a Kingstone EMMC32G-TX29, and the manual write different CLK frequency's, I am don't know what I need to look.
I have a Fnirsi dst-210 3in1 (sure not the best), which I could use measurements but I do not know how to set the oscilloscope parameters to find the CLK.
