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micropython/ports/esp8266/makeimg.py
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import sys | |
import struct | |
import hashlib | |
# This region at the start of flash contains a small header and then segments | |
# containing .text, .data and .rodata, and so must be large enough to hold all | |
# of this. This data is loaded to the appropriate places in RAM by the ROM | |
# bootloader at boot. After this in flash comes .irom0.text, which must begin | |
# on a flash erase-page boundary. | |
SEGS_MAX_SIZE = 0x9000 | |
assert len(sys.argv) == 4 | |
md5 = hashlib.md5() | |
with open(sys.argv[3], "wb") as fout: | |
with open(sys.argv[1], "rb") as f: | |
data_flash = f.read() | |
fout.write(data_flash) | |
# First 4 bytes include flash size, etc. which may be changed | |
# by esptool.py, etc. | |
md5.update(data_flash[4:]) | |
print("flash ", len(data_flash)) | |
# Print info about segments in this first part of flash | |
num_segs = struct.unpack_from("<BBBBI", data_flash, 0)[1] | |
offset = 8 | |
for seg_num in range(num_segs): | |
seg_name = [".text", ".data", ".rodata"][seg_num] | |
seg_offset, seg_size = struct.unpack_from("<II", data_flash, offset) | |
print(" {:7} {} at 0x{:x}".format(seg_name, seg_size, seg_offset)) | |
offset += 8 + seg_size | |
with open(sys.argv[2], "rb") as f: | |
data_rom = f.read() | |
pad = b"\xff" * (SEGS_MAX_SIZE - len(data_flash)) | |
assert len(pad) >= 4 | |
fout.write(pad[:-4]) | |
md5.update(pad[:-4]) | |
len_data = struct.pack("I", SEGS_MAX_SIZE + len(data_rom)) | |
fout.write(len_data) | |
md5.update(len_data) | |
print("padding ", len(pad)) | |
fout.write(data_rom) | |
md5.update(data_rom) | |
print("irom0text", len(data_rom)) | |
fout.write(md5.digest()) | |
print("total ", SEGS_MAX_SIZE + len(data_rom)) | |
print("md5 ", md5.hexdigest()) |