259 lines
7.8 KiB
Python
259 lines
7.8 KiB
Python
# Update Mboot or MicroPython from a .dfu.gz file on the board's filesystem
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# MIT license; Copyright (c) 2019-2022 Damien P. George
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from micropython import const
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import struct, time
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import uzlib, machine, stm
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# Constants to be used with update_mpy
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VFS_FAT = 1
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VFS_LFS1 = 2
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VFS_LFS2 = 3
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# Constants for creating mboot elements.
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_ELEM_TYPE_END = const(1)
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_ELEM_TYPE_MOUNT = const(2)
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_ELEM_TYPE_FSLOAD = const(3)
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_ELEM_TYPE_STATUS = const(4)
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def check_mem_contains(addr, buf):
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mem8 = stm.mem8
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r = range(len(buf))
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for off in r:
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if mem8[addr + off] != buf[off]:
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return False
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return True
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def dfu_read(filename):
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from binascii import crc32
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f = open(filename, "rb")
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hdr = f.read(3)
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f.seek(0)
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if hdr == b"Dfu":
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pass
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elif hdr == b"\x1f\x8b\x08":
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f = uzlib.DecompIO(f, 16 + 15)
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else:
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print("Invalid firmware", filename)
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return None
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crc = 0
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elems = []
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hdr = f.read(11)
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crc = crc32(hdr, crc)
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sig, ver, size, num_targ = struct.unpack("<5sBIB", hdr)
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file_offset = 11
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for i in range(num_targ):
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hdr = f.read(274)
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crc = crc32(hdr, crc)
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sig, alt, has_name, name, t_size, num_elem = struct.unpack("<6sBi255sII", hdr)
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file_offset += 274
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file_offset_t = file_offset
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for j in range(num_elem):
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hdr = f.read(8)
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crc = crc32(hdr, crc)
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addr, e_size = struct.unpack("<II", hdr)
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data = f.read(e_size)
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crc = crc32(data, crc)
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elems.append((addr, data))
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file_offset += 8 + e_size
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if t_size != file_offset - file_offset_t:
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print("corrupt DFU", t_size, file_offset - file_offset_t)
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return None
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if size != file_offset:
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print("corrupt DFU", size, file_offset)
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return None
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hdr = f.read(16)
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crc = crc32(hdr[:-4], crc)
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hdr = struct.unpack("<HHHH3sBI", hdr)
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crc = ~crc & 0xFFFFFFFF
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if crc != hdr[-1]:
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print("CRC failed", crc, hdr[-1])
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return None
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return elems
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class Flash:
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_FLASH_KEY1 = 0x45670123
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_FLASH_KEY2 = 0xCDEF89AB
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def __init__(self):
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import os, uctypes
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self.addressof = uctypes.addressof
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# Detect MCU.
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machine = os.uname().machine
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if "STM32F4" in machine or "STM32F7" in machine:
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dev_id = stm.mem32[0xE004_2000] & 0xFFF
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elif "STM32H7" in machine:
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dev_id = stm.mem32[0x5C00_1000] & 0xFFF
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else:
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dev_id = 0
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# Configure flash parameters based on MCU.
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if dev_id in (0x413, 0x419, 0x431, 0x451, 0x452):
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# 0x413: STM32F405/407, STM32F415/417
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# 0x419: STM32F42x/43x
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# 0x431: STM32F411
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# 0x451: STM32F76x/77x
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# 0x452: STM32F72x/73x
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self._keyr = stm.FLASH + stm.FLASH_KEYR
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self._sr = stm.FLASH + stm.FLASH_SR
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self._sr_busy = 1 << 16
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self._cr = stm.FLASH + stm.FLASH_CR
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self._cr_lock = 1 << 31
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self._cr_init_erase = lambda s: 2 << 8 | s << 3 | 1 << 1 # PSIZE=32-bits, SNB, SER
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self._cr_start_erase = 1 << 16 # STRT
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self._cr_init_write = 2 << 8 | 1 << 0 # PSIZE=32-bits, PG
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self._cr_flush = None
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self._write_multiple = 4
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if dev_id == 0x451 and stm.mem32[0x1FFF_0008] & 1 << 13: # check nDBANK
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# STM32F76x/77x in single-bank mode
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self.sector0_size = 32 * 1024
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else:
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self.sector0_size = 16 * 1024
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elif dev_id == 0x450:
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# 0x450: STM32H742, STM32H743/753, STM32H750
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self._keyr = stm.FLASH + stm.FLASH_KEYR1
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self._sr = stm.FLASH + stm.FLASH_SR1
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self._sr_busy = 1 << 2 # QW1
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self._cr = stm.FLASH + stm.FLASH_CR1
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self._cr_lock = 1 << 0 # LOCK1
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self._cr_init_erase = lambda s: s << 8 | 3 << 4 | 1 << 2 # SNB1, PSIZE1=64-bits, SER1
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self._cr_start_erase = 1 << 7 # START1
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self._cr_init_write = 3 << 4 | 1 << 1 # PSIZE1=64-bits, PG1=1
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self._cr_flush = 1 << 6 # FW1=1
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self._write_multiple = 16
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self.sector0_size = 128 * 1024
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else:
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raise Exception(f"unknown MCU {machine} DEV_ID=0x{dev_id:x}")
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def wait_not_busy(self):
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while stm.mem32[self._sr] & self._sr_busy:
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machine.idle()
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def unlock(self):
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if stm.mem32[self._cr] & self._cr_lock:
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stm.mem32[self._keyr] = self._FLASH_KEY1
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stm.mem32[self._keyr] = self._FLASH_KEY2
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def lock(self):
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stm.mem32[self._cr] = self._cr_lock
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def erase_sector(self, sector):
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assert 0 <= sector <= 7
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self.wait_not_busy()
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stm.mem32[self._cr] = self._cr_init_erase(sector)
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stm.mem32[self._cr] |= self._cr_start_erase
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self.wait_not_busy()
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stm.mem32[self._cr] = 0
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# This method is optimised for speed, to reduce the time data is being written.
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def write(self, addr, buf):
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assert len(buf) % 4 == 0
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mem32 = stm.mem32
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buf_addr = self.addressof(buf)
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r = range(0, len(buf), 4)
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self.wait_not_busy()
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mem32[self._cr] = self._cr_init_write
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for off in r:
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mem32[addr + off] = mem32[buf_addr + off]
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if off % self._write_multiple == 0:
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while mem32[self._sr] & self._sr_busy:
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pass
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if self._cr_flush is not None:
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mem32[self._cr] |= self._cr_flush
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self.wait_not_busy()
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mem32[self._cr] = 0
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def update_mboot(filename):
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print("Loading file", filename)
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mboot_fw = dfu_read(filename)
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if mboot_fw is None:
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return
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if len(mboot_fw) != 1:
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assert 0
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mboot_addr, mboot_fw = mboot_fw[0]
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if mboot_addr != 0x08000000:
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assert 0
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print("Found Mboot data with size %u." % len(mboot_fw))
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chk = check_mem_contains(mboot_addr, mboot_fw)
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if chk:
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print("Supplied version of Mboot is already on device.")
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return
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print("Programming Mboot, do not turn off!")
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time.sleep_ms(50)
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flash = Flash()
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irq = machine.disable_irq()
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flash.unlock()
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flash.erase_sector(0)
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if len(mboot_fw) > flash.sector0_size:
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flash.erase_sector(1)
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flash.write(mboot_addr, mboot_fw)
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flash.lock()
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machine.enable_irq(irq)
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print("New Mboot programmed.")
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if check_mem_contains(mboot_addr, mboot_fw):
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print("Verification of new Mboot succeeded.")
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else:
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print("Verification of new Mboot FAILED! Try rerunning.")
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print("Programming finished, can now reset or turn off.")
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def _create_element(kind, body):
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return bytes([kind, len(body)]) + body
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def update_mpy(filename, fs_base, fs_len, fs_type=VFS_FAT, fs_blocksize=0, status_addr=None):
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# Check firmware is of .dfu or .dfu.gz type
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try:
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with open(filename, "rb") as f:
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hdr = uzlib.DecompIO(f, 16 + 15).read(6)
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except Exception:
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with open(filename, "rb") as f:
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hdr = f.read(6)
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if hdr != b"DfuSe\x01":
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print("Firmware must be a .dfu(.gz) file.")
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return
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if fs_type in (VFS_LFS1, VFS_LFS2) and not fs_blocksize:
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raise Exception("littlefs requires fs_blocksize parameter")
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mount_point = 1
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elems = _create_element(
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_ELEM_TYPE_MOUNT,
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struct.pack("<BBLLL", mount_point, fs_type, fs_base, fs_len, fs_blocksize),
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)
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elems += _create_element(
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_ELEM_TYPE_FSLOAD, struct.pack("<B", mount_point) + bytes(filename, "ascii")
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)
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if status_addr is not None:
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# mboot will write 0 to status_addr on succes, or a negative number on failure
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machine.mem32[status_addr] = 1
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elems += _create_element(_ELEM_TYPE_STATUS, struct.pack("<L", status_addr))
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elems += _create_element(_ELEM_TYPE_END, b"")
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machine.bootloader(elems)
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