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

I have used the knife blade (not the tip) to pry the top cover at one of the corners.

The DQ08 board has working serial console @1500000bps, where one can see the u-boot and kernel log. Can't wait for wiping this android spyware from eMMC and installing Debian 🤩 U-Boot SPL board init U-Boot SPL 2017.09-g0fbedd0675-230404 #zyf (Apr 11 2023 - 09:25:18) ... U-Boot 2017.09 (Aug 08 2023 - 02:31:42 +0800) Model: Rockchip RK3528 Evaluation Board Bootdev(atags): mmc 0 MMC0: HS400 Enhanced Strobe, 200Mhz PartType: EFI Android 13.0, Build 2023.3, v2 boot mode: None Device is: UNLOCKED DTB: rk-kernel.dtb Model: Rockchip RK3528 DEMO1 LP4 V10 Board ... Hit key to stop autoboot('CTRL+C'): 0 ANDROID: reboot reason: "(none)" Vboot=0, AVB images, AVB verify read_is_device_unlocked() ops returned that device is UNLOCKED avb_slot_verify.c:763: ERROR: vbmeta: Error verifying vbmeta image: OK_NOT_SIGNED ... Booting Linux on physical CPU 0x0000000000 [0x410fd034]M Linux version 5.10.157 (user@epyc) (Android (8490178, based on r450784d) clang version 14.0.6 (https://android.googlesource.com/toolchain/llvm-project 4c603efb0cca074e9238af8b4106c30add4418f6), LLD 14.0.6) #1 SMP PREEMPT Mon Aug 7 22:09:04 CST Machine model[[0m: Rockchip RK3528 DEMO1 LP4 V10 Board ... wlan_platdata_parse_dt: wifi_chip_type = rtl8822cs wlan_platdata_parse_dt: 5nable wifi power control. wlan_platdata_parse_dt: wifi power controled by gpio. wlan_platdata_parse_dt: WIFI,poweren_gpio = 106 flags = 0. wlan_platdata_parse_dt: WIFI,host_wake_irq = 107, flags = 0. bluetooth_platdata_parse_dt: get property: uart_rts_gpios = 98. bluetooth_platdata_parse_dt: get property: BT,reset_gpio = 114. bluetooth_platdata_parse_dt: get property: BT,wake_host_irq = 113. ... mmc0: new ultra high speed SDR104 SDIO card at address 0001 mmc2: new HS440 Enhanced strobe MMC card at address 0001 mmcblk2: mmc2:0001 95"000 58.7 GiB dhd_os_open_image: /vendor/etc/firmware/fw_bcm4335b0_ag.bin (607578 bytes) open success dhd_os_open_image: /vendor/etc/firmware/nvram_bcm4335.txt (2675 bytes) open success NVRAM version: SEMCO B62_G3_VID:3388 (4335B0) - FW171.24.16_03/19 dhdsdio_write_vars: Download, Upload and coopare of NVRAM succeeded.