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esp8266: Add Python modules for initial configuration.
Main entry point is _boot.py which checks whether FAT FS in flash mountable, and if so, mounts it. Otherwise, it checks if flash is empty, and if so, performs initial module setup: makes FAT FS, configures default AP name, etc. As a last option, if flash is not empty, and could not be mounted, it means filesystem corruption, and warning message with instructions is printed in an infinite loop.
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‎esp8266/scripts/_boot.py‎

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import uos
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import builtins
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from flashbdev import bdev
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try:
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vfs = uos.VfsFat(bdev, "/")
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except OSError:
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import inisetup
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inisetup.check_bootsec()
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uos.VfsFat.mkfs(bdev)
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vfs = uos.VfsFat(bdev, "/")
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inisetup.wifi()

‎esp8266/scripts/flashbdev.py‎

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import esp
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class FlashBdev:
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SEC_SIZE = 4096
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START_SEC = 0xa0000 // SEC_SIZE
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NUM_BLK = 64
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def __init__(self, blocks=NUM_BLK):
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self.blocks = blocks
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def readblocks(self, n, buf):
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print("readblocks(%s, %x(%d))" % (n, id(buf), len(buf)))
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esp.flash_read((n + self.START_SEC) * self.SEC_SIZE, buf)
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def writeblocks(self, n, buf):
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print("writeblocks(%s, %x(%d))" % (n, id(buf), len(buf)))
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assert len(buf) <= self.SEC_SIZE, len(buf)
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esp.flash_erase(n + self.START_SEC)
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esp.flash_write((n + self.START_SEC) * self.SEC_SIZE, buf)
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def ioctl(self, op, arg):
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print("ioctl(%d, %r)" % (op, arg))
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if op == 4: # BP_IOCTL_SEC_COUNT
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return self.blocks
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if op == 5: # BP_IOCTL_SEC_SIZE
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return self.SEC_SIZE
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bdev = FlashBdev()

‎esp8266/scripts/inisetup.py‎

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import uos
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import network
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from flashbdev import bdev
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def wifi():
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import ubinascii
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ap_if = network.WLAN(network.AP_IF)
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ap_if.config(essid=b"MicroPython %s" % ubinascii.hexlify(ap_if.mac()[-3:]))
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def check_bootsec():
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buf = bytearray(bdev.SEC_SIZE)
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bdev.readblocks(0, buf)
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empty = True
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for b in buf:
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if b != 0xff:
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empty = False
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break
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if empty:
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return True
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fs_corrupted()
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def fs_corrupted():
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import time
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while 1:
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print("""\
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FAT filesystem appears to be corrupted. If you had important data there, you
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may want to make a flash snapshot to try to recover it. Otherwise, perform
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factory reprogramming of MicroPython firmware (completely erase flash, followed
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by firmware programming).
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""")
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time.sleep(3)

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