micropython/ports/mimxrt/modules/_boot.py

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# _boot.py
# Try to mount the filesystem, and format the flash if it doesn't exist.
# Note: the flash requires the programming size to be aligned to 256 bytes.
import os
import sys
import mimxrt
from machine import Pin
bdev = mimxrt.Flash()
try:
vfs = os.VfsLfs2(bdev, progsize=256)
except:
os.VfsLfs2.mkfs(bdev, progsize=256)
vfs = os.VfsLfs2(bdev, progsize=256)
os.mount(vfs, "/flash")
os.chdir("/flash")
sys.path.append("/flash")
# do not mount the SD card if SKIPSD exists.
try:
os.stat("SKIPSD")
except:
try:
from machine import SDCard
sdcard = SDCard(1)
fat = os.VfsFat(sdcard)
os.mount(fat, "/sdcard")
os.chdir("/sdcard")
sys.path.append("/sdcard")
except:
pass # Fail silently