I'm trying to get a smaller LCD working on my Win Plus (again, I had it before but was on Jessie I think, old at least).
You need to use the BCM numbers from gpio readall and map to the physical pins the seller usually gives.
For example my screen use pin 18 and 22 for DC and reset, so they map to 68 and 230 for Win Plus (but now I get SPI timing out, at least the pins do "mount" now, when I was trying BCM values for the Lite it's running on - 71 and 2 - I got an error on pins).
(These pinouts used in /etc/modprobe.d/fbtft.conf).
Sorry for bit confused reply, hope it helps.
-- Edit:
I was following the same guide you sent also (and all others I could find, plus the older ones I used before) so I guess you took the same steps -
After raising max frequency - /boot/armbianEnv.txt -> param_spidev_max_freq=16000000 - (I dont think I changed anything else at least) I got rid of errors from dmesg but the screen is still blank (white) on Win.
Edit2:
Tried on another sd card (strectch, earlier was on a bionic build), now I again get the same error, SPI timing out and max_freq didnt help this time. Checking what other settings I could have messed with but I'm pretty sure only other thing I changed was the framebuffer used from 8 to 0 or back.
Edit3 (and last):
I tried the bionic card again, error was back so I dont know why it disappeared. Still no progress beyond this point, if I figure something out I'll update or reply again.