epost.deb

I can confirm the 5GHz operation on DQ08 board. Now it's time to have a closer look at the kernel source and the non-matching DTS mess.

Android DTB itself is broken in many ways, mainly because wifi gpios from DTB do not show up in the gpioinfo output. It is more important to put the brcm4335-sdio firmware in /lib/firmware/brcm, which is missing in the armbian repository. iw phy0 info shows support of the 5GHz channels, but i don't have such access points nearby. I will check tomorrow with my dual-band AP.

I have compiled debian trixie image from the repository of @johlnx for Vontar DQ08 4G+64G and flashed it to eMMC, also adjusting the DTB for wifi GPIOs. Wifi works with the brcm4335 firmware (at least in the 2.4GHz band), usb3.0 works too. Bluetooth does not work and there are still many nasty error messages in the 'dmesg' output.

Proprietary DDR and maskrom images from Rockchip Bare metall should provide DDR init replacement code, the only missing part in u-boot.

@jock Is it possible to dump BOOTROM from Linux, or is it hidden/shadowed by ATF ? There is RK3399 dumper code at github, so i am wondering if the same can be done on RK3528.

@jock It looks like a known bug in the rk35xx u-boot code fixed by luckfox-lyra-ultra-yocto