FAQS

Build kernel, show "IO-Domain Checklist" Dialog

kernel new dts file "arch/arm64/boot/dts/rockchip/rk3568-firefly-aioj-
DEMO.dts"and when build kernel, will show dialog

Perform the following operations first

   cp arch/arm64/boot/dts/rockchip/.rk3568-firefly-aioj.dtb.dts.tmp.domain arch/arm64/boot/dts/rockchip/.rk3568-firefly-aioj-DEMO.dtb.dts.tmp.domain

Do not change the IO-Domain. Otherwise, IO may be damaged in the worst
case.

Changes in kernel/buildroot configuration doesn't take effect after
compiling

After changing configuration through "make menuconfig", compiling with
"build.sh" and burning into device, the changes doesn't take effect.
Then you check the configuration and find out that the previous
changes have disappeared.

That's because the changes are only saved in temporary file ".config".
While compiling, "build.sh" will overwrite ".config" with
configuration file.

So changes need to be saved in configuration file:

   make ARCH=arm64 savedefconfig
   mv defconfig arch/arm64/configs/firefly_linux_defconfig

Then use "build.sh" to compile.

How to adjust HDMI output resolution manually ?

In addition to adjusting the resolution in
"Setting->Display->HDMI->Resolution", we could also use command below
to switch 4K resoultion and flash screen:

   # 4k60:
   setprop persist.sys.resolution.main 3840x2160@60 
   # Set sys.display.timeline base on the default num to plus one for updating resolution
   setprop sys.display.timeline 1

The 3.5mm headphone jack is connected to the national standard
headphone abnormal?

At present, Core-3568J only supports the American standard type of
headphones(CTIA). For the national standard type of headphones(OMTP),
the hardware is not compatible, and there will be the phenomenon of
dual sound channels in both the left and right channels.

What should I do if the boot is abnormal and restarts cyclically?

It may be that the power supply current is not enough. Please use a
power supply with a voltage of 12V and a current of 2.5A~3A.

What is the default username and password for Ubuntu?

Username: firefly

Password: firefly

Switch super user sudo -s

Write number tool to write SN, MAC address

Note:

 If the eMMC erase operation is performed on the development board,
the previously written data will also be cleared.

Windows way

Install RKDevInfoWriteTool  Download link

Select "RPMB" in Settings of RKDevInfoWriteTool

Configure "SN", "WIFI MAC", "LAN MAC", "BT MAC", etc. in the Settings
of RKDevInfoWriteTool as needed

The development board enters loader mode

RKDevInfoWriteTool performs write or read operations

For specific operations, please refer to the PDF document
"RKDevInfoWriteTool User Guide" under the RKDevInfoWriteTool
installation directory.

Linux way

How to write the number of the development board itself

Buildroot enable BR2_PACKAGE_VENDOR_STORAGE

Read and write operations through the vendor_storage command  Download
link  SN  vendor_storage -w VENDOR_SN_ID -t string -i cad895bedb8ee15f
vendor_storage -r VENDOR_SN_ID -t hex -i /dev/null  LAN MAC
vendor_storage -w VENDOR_LAN_MAC_ID -t string -i AABBCCDDEEFF
vendor_storage -r VENDOR_LAN_MAC_ID -t hex -i /dev/null    Others can
be operated according to the prompt of `vendor_storage -h`.

For how to read the application, please refer to the
"vendor_storage_read" function in
"buildroot/package/rockchip/vendor_storage/vendor_storage.c".

On Ubuntu system, if there is no sound after plugging in headphones,
what should I do?

"Menu" -> "Multimedia" -> "PulseAudio Volume Control" ->
"Configuration" -> Select the sound card that is working and turn off
the other sound card.

How to make the system crawl LOG under Android?

1、"Settings (settings)" -> "About tablet (about tablet)" -> Click 7
times "Build number (version number)"

2、"Settings (settings)" ->"System(system)"->"Advanced(advanced)"->
"Developer options (Developer options)" -> "Android LogSave". After
the function is turned on, the log will be generated under the root
directory of the system "/data/vendor/logs", which includes the system
logcat and kernel kmsg.

Problems encountered in compiling boot.img of Android

The system will boot in recovery mode without using "BOOT_IMG" to
compile kernel, specify a boot.img like "BOOT_IMG=../rockdev/Image-
rk3568_firefly_aioj/boot.img" when compiling kernel, the boot.img will
update in directory "SDK/kernel" after compilation.

   make ARCH=arm64 BOOT_IMG=../rockdev/Image-rk3568_firefly_aioj/boot.img rk3568-firefly-aioj.img -j8

If "rockdev" is not available, please compile the SDK completely
first, and refer to

Public Compile

.