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237c519ac4
All Flash sans firmware at the beginning and 16K SDK param block at the end is used for filesystem (and that's calculated depending on the Flash size).
69 lines
2.0 KiB
Python
69 lines
2.0 KiB
Python
import esp
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class FlashBdev:
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SEC_SIZE = 4096
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START_SEC = 0x89000 // SEC_SIZE
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NUM_BLK = 0x73
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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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def set_bl_flash_size(real_size):
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if real_size == 256*1024:
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code = 1
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elif real_size == 512*1024:
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code = 0
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elif real_size == 1024*1024:
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code = 2
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elif real_size == 2048*1024:
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code = 3
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elif real_size == 4096*1024:
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code = 4
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else:
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code = 2
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buf = bytearray(4096)
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esp.flash_read(0, buf)
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buf[3] = (buf[3] & 0xf) | (code << 4)
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esp.flash_erase(0)
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esp.flash_write(0, buf)
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# If bootloader size ID doesn't correspond to real Flash size,
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# fix bootloader value and reboot.
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size = esp.flash_id() >> 16
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# Check that it looks like realistic power of 2 for flash sizes
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# commonly used with esp8266
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if 22 >= size >= 18:
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size = 1 << size
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if size != esp.flash_size():
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import machine
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import time
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print("Bootloader Flash size appear to have been set incorrectly, trying to fix")
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set_bl_flash_size(size)
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machine.reset()
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while 1: time.sleep(1)
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size = esp.flash_size()
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if size < 1024*1024:
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bdev = None
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else:
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# 16K at the flash end is reserved for SDK params storage
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bdev = FlashBdev((size - 16384) // FlashBdev.SEC_SIZE - FlashBdev.START_SEC)
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