Just to be sure I repeated this process on an Rpi 3 - I works as I would
expect.

Can you please try again on a freshly written sd of 3.21 using the first
part of my instructions to get output on the TFT screen before moving on
to Jivelite. The process should take less than 1 hour.

You need to append this to sd card FAT partition cmdline.txt

Code:
--------------------
     fbcon=map:10 fbcon=font:ProFont6x11 logo.nologo
--------------------


And change the following lines in config.txt

Code:
--------------------
    framebuffer_width=480
  framebuffer_height=320
  
  [ALL]
  #----------------------------------------------------
  dtparam=i2c=on,spi=on,i2s=on
  
dtoverlay=ads7846,speed=1000000,penirq=17,penirq_pull=2,swapxy=1,xmin=200,xmax=3900,ymin=200,ymax=3900,pmax=255,xohms=60
  
  
--------------------


and add the following to the end of /mnt/opt bootlocal.sh

Code:
--------------------
    #pCPstop------
  
  modprobe flexfb  width=320  height=480  regwidth=16 
init=-1,0xb0,0x0,-1,0x11,-2,250,-1,0x3A,0x55,-1,0xC2,0x44,-1,0xC5,0x00,0x00,0x00,0x00,-1,0xE0,0x0F,0x1F,0x1C,0x0C,0x0F,0x08,0x48,0x98,0x37,0x0A,0x13,0x04,0x11,0x0D,0x00,-1,0xE1,0x0F,0x32,0x2E,0x0B,0x0D,0x05,0x47,0x75,0x37,0x06,0x10,0x03,0x24,0x20,0x00,-1,0xE2,0x0F,0x32,0x2E,0x0B,0x0D,0x05,0x47,0x75,0x37,0x06,0x10,0x03,0x24,0x20,0x00,-1,0x36,0x28,-1,0x11,-1,0x29,-3
  modprobe fbtft_device debug=3 rotate=90 name=flexfb speed=16000000 
gpios=reset:25,dc:24
  
--------------------


Do let me know how you get on ...


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