show micropython welcome on boot (esp8266 + 1306)

boot.py

# This file is executed on every boot (including wake-boot from deepsleep)
#import esp
#esp.osdebug(None)
import uos, machine
#uos.dupterm(None, 1) # disable REPL on UART(0)
import gc

from machine import Pin, I2C
import ssd1306

# using default address 0x3C
i2c = I2C(sda=Pin(5), scl=Pin(4))
display = ssd1306.SSD1306_I2C(128, 64, i2c)

display.fill(0)
display.fill_rect(0, 0, 32, 32, 1)
display.fill_rect(2, 2, 28, 28, 0)
display.vline(9, 8, 22, 1)
display.vline(16, 2, 22, 1)
display.vline(23, 8, 22, 1)
display.fill_rect(26, 24, 2, 4, 1)
display.text('MicroPython', 40, 0, 1)
display.text('v1.19.1', 40, 12, 1)
display.text('1306@128x64', 40, 24, 1)
display.show()

#import webrepl
#webrepl.start()
gc.collect()