esp8266/makeimg.py: Print out info about RAM segments when building fw.
diff --git a/ports/esp8266/makeimg.py b/ports/esp8266/makeimg.py
index a81b2d0..4d31cc0 100644
--- a/ports/esp8266/makeimg.py
+++ b/ports/esp8266/makeimg.py
@@ -2,6 +2,11 @@
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
@@ -18,6 +23,15 @@
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()