Tuya XR806 RT-WT501 flashed with OpenXR806 via phoenixMC, no AP or logs?

Hello,

I know it's for a different board, but if you don't mind I'll ask here. its a RT-WT501. I have access to the board and it has XR806af2e. I was able to flash it with

OpenXR806_1.18.287.img

but it does not start any AP or I can't get any logs with

minicom

under ubintu. Can you advice how to troubleshoot further?

Are you sure there is no bootlog? Was there bootlog before you flashed OBK? Do you have firmware copy?

probably one of those pesky DCDC-powered types. Maybe we need a variant for those. I still don't have a DCDC-capable XR806 test device.

What do you mean by DCDC? A voltage converter? Any more information on that?

we've seen it in a couple of XR806s. @jmkrzyszt was playing with a build. The factory boot log gives away the DCDC/LDO type

https://www.elektroda.com/rtvforum/topic4115856.html#21746224

or maybe it's an xtal variant: https://www.elektroda.com/rtvforum/topic4115856.html#21779853 - as highlighted by @insmod

We have a couple of DCDC dumps that I haven't been able to test. The Avatto smart watering device was DCDC and its image (the OTA file from Tuya which includes bootloader) is what killed my 1st XR806 5v dev board,

https://www.elektroda.com/rtvforum/topic4064188.html

Added after 1 [minutes]:

https://github.com/openshwprojects/OpenBK7231T_App/pull/1893

Added after 3 [minutes]:

divadiow wrote:

or maybe it's an xtal variant

maybe not

I have another device, but still can't find a way to dump its firmware. The device is using 4xAA batteries and it must produce 3.3v from them. The valve inside is 3v. Also few labels around the pins for 3.3v...

I'd definitely make a point of nailing a backup first so you have a way back should OpenXR806 not work out. Might even have the KV still intact on your first device, so take a backup of that too.

https://www.elektroda.com/rtvforum/topic4115856.html

I was able to dump something with:

phoenixMC -c /dev/ttyUSB0 -b 921600 -D read -A 0x00000000 -L 0x00200000

and it is attached.

ah very good.

did you happen to capture debug boot log too - plain-text terminal log.

I'll cautiously flash your backup to WXU module to see if it boots

Added after 22 [minutes]:

I was able to capture logs (from beginning hopefully):

mkrum001 wrote:

I was able to capture logs (from beginning hopefully):

sadly not the very beginning, the bit that includes the power info as seen in the log I posted.

My power info seen in boot log should not be assumed to be the same as yours will show on real device.

Did you manage to safely power your first device to see if you get any boot log from OpenXR806 at all? Might be an idea to try RX and TX pads for log output

Added after 42 [minutes]:

I think we should probably have 3 variants to cover the XR806s power options

-INT LDO (current OpenXR806)
-INT DCDC
-EXT PWR

Added after 27 [minutes]:

seems EXT PWR can cover lots of different board implementations, for example:

external fixed 1.8 V rail
external switchable 1.8 V / 2.5 V rail
external LDO
external buck
PMIC-controlled rail
GPIO-controlled voltage select
inverted/non-inverted control logic
different settle delays
different pins used for switching

so that would be tricky. I wonder if we're ever likely to encounter any