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@jock The schematic is maybe was a wrong example (I just search for rk3399 schematic, and take the first) in this case Leez P710, but I also look at the RK3399_Design_Guide and find a interesting point, UART2 based on the sd card pins!!! I already read a bit regarding the ddrbin_tool.py (which is part of the rkbin), which one could be used to manipulate the rockchip boot loader, but until now I not really understood how this work, then I find this in the Rockpi4 schematic I became enlightened. In the ddrbin_tool_user_guide is the following: * UART info uart id: uart number. 0 for uart0, 1 for uart1, 2 for uart2..., 0xf will disable uart. uart iomux: uart iomux info, 0 for uartn_m0, 1 for uartn_m1, 2 for uartn_m2...(like uart2_m0, uart2_m1,uart2_m2), or 1 for uartn_a, 2 for uartn_b, 3 for uartn_c.(like uar2a, uart2b, uart2c). uart baudrate: uart baudrate should be 115200 or 1500000. I still don't understanding what the iomux (io multiplexing) is, but in theory if I change the uart iomux parameter to 1 then this should means that UART2A is used, which is SD card D0,D1 pins. (Similar concept I see in Amlogic SoCs. ) So I read out the ddrbin parameters from rk3399_ddr_800MHz_v1.27.bin ./tools/ddrbin_tool.py RK3399 -g ddrbin_param.txt ./bin/rk33/rk3399_ddr_800MHz_v1.27.bin then I change the UART parameters in the file ddrbin_param.txt like this: uart id=2 uart iomux=1 uart baudrate=115200 then I write the parameters back ./tools/ddrbin_tool.py RK3399 ddrbin_param.txt ./bin/rk33/rk3399_ddr_800MHz_v1.27.bin Then I build a new loader based on the rk3399_ddr_800MHz_v1.27.bin ./tools/boot_merger ./RKBOOT/RK3399MINIALL_1.27.ini Content of the ./RKBOOT/RK3399MINIALL_1.27.ini [CHIP_NAME] NAME=RK330C [VERSION] MAJOR=1 MINOR=30 [CODE471_OPTION] NUM=1 Path1=bin/rk33/rk3399_ddr_800MHz_v1.27.bin Sleep=1 [CODE472_OPTION] NUM=1 Path1=bin/rk33/rk3399_usbplug_v1.26.bin [LOADER_OPTION] NUM=2 LOADER1=FlashData LOADER2=FlashBoot FlashData=bin/rk33/rk3399_ddr_800MHz_v1.27.bin FlashBoot=bin/rk33/rk3399_miniloader_v1.26.bin [OUTPUT] PATH=rk3399_loader_v1.27.126.bin The result was uploaded in the emmc rkdeveloptool db rk3399_loader_v1.27.126.bin rkdeveloptool ul rk3399_loader_v1.27.126.bin the I connected my microsd sniffer and after some praying I reset the device ... Then the magic is happened 🤩 DDR Version 1.27 20211018 In channel 0 CS = 0 MR0=0x18 MR4=0x1 MR5=0x1 MR8=0x10 MR12=0x72 MR14=0x72 MR18=0x0 MR19=0x0 MR24=0x8 MR25=0x0 channel 1 CS = 0 MR0=0x18 MR4=0x1 MR5=0x1 MR8=0x10 MR12=0x72 MR14=0x72 MR18=0x0 MR19=0x0 MR24=0x8 MR25=0x0 channel 0 training pass! channel 1 training pass! change freq to 416MHz 0,1 Channel 0: LPDDR4,416MHz Bus Width=32 Col=10 Bank=8 Row=16 CS=1 Die Bus-Width=16 Size=2048MB Channel 1: LPDDR4,416MHz Bus Width=32 Col=10 Bank=8 Row=16 CS=1 Die Bus-Width=16 Size=2048MB 256B stride channel 0 CS = 0 MR0=0x18 MR4=0x1 MR5=0x1 MR8=0x10 MR12=0x72 MR14=0x72 MR18=0x0 MR19=0x0 MR24=0x8 MR25=0x0 channel 1 CS = 0 MR0=0x18 MR4=0x1 MR5=0x1 MR8=0x10 MR12=0x72 MR14=0x72 MR18=0x0 MR19=0x0 MR24=0x8 MR25=0x0 channel 0 training pass! channel 1 training pass! channel 0, cs 0, advanced training done channel 1, cs 0, advanced training done change freq to 856MHz 1,0 ch 0 ddrconfig = 0x101, ddrsize = 0x40 ch 1 ddrconfig = 0x101, ddrsize = 0x40 pmugrf_os_reg[2] = 0x32C1F2C1, stride = 0xD ddr_set_rate to 328MHZ ddr_set_rate to 666MHZ ddr_set_rate to 416MHZ, ctl_index 0 ddr_set_rate to 856MHZ, ctl_index 1 support 416 856 328 666 MHz, current 856MHz OUT Boot1 Release Time: May 29 2020 17:36:36, version: 1.26 CPUId = 0x0 ChipType = 0x10, 645 SdmmcInit=2 0 BootCa Yes, is working, I have debug output 😁 this is maybe not the best solution but I could start working running Armbian on this device. The key point was: So thanks again the advise.

@jock Than you for the hints. If I measure on all (except GND) UART Pin 3.3V is not indicate that all resistor in place? Regarding the rk3399 schematic design, there should be some 100 ohm resistors there. To be honest for me was also very difficult to find the MaskRom pins, search something what is not there is a bit challenging. I measure all black SMD item (far as I know they are resistors), but non of them 100 ohm. (The board other side I do not see any missing resistor) Could you please advise me what I need to look? There is 3 point where possible to solder resistor, how to identify which one I need?

@BigDi I was able flash the Image Armbian_26.2.1_Nanopim4v2_trixie_current_6.18.8_minimal.img.xz to the emmc and start Armbian on the device. Interesting that Wifi (Realtek RTL8821CU) is work well but Ethernet not.

Thank you for the update, good to hear there is possible to run Linux on the box. In other hand, little bit is surprising, I try Nanopi M4 image and many other images, but non of work for me. Far as I know Rockchip have fixed boot order (emmc -> sd cadr ... ). Do you have a working Android on emmc and Armbian on sd card? On the weekend I will try also again the SD card boot. To answer your questions: I did not use any DTB at yet I only try rkbin boot loaders which not need to build. I was also able to extract the Android 11 Image there was model name "Giada JHS558" entered, I assume you have older Android version where the vendor use the Excavator Board as basis for the device tree.

Yes, shorting the pins I was switch the device into MaskRom mode and install Android. Now I trying to identify and use the debug console, not much success so far

Take some time but I was able to identify the CLK pin. Shorting the marked pins (CLK and GND in this case) was able to switch MaskRom mode. Note: in early boot stages the eMMC CLK only working in legacy mode (24Mhz).

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.