Added bootloader.

1 files changed, 47 insertions, 0 deletions

diff --git a/dfugen.py b/dfugen.py
new file mode 100755
index 0000000..dc93d1d
--- /dev/null
+++ b/dfugen.py
@@ -0,0 +1,47 @@
+#!/usr/bin/env python
+
+import sys, struct, zlib
+from elftools.elf.elffile import ELFFile
+
+infile = sys.argv[1]
+outfile = sys.argv[2]
+
+e = ELFFile(open(infile))
+
+buf = ''
+
+for segment in sorted(e.iter_segments(), key = lambda x: x.header.p_paddr):
+	if segment.header.p_type != 'PT_LOAD':
+		continue
+	
+	data = segment.data()
+	lma = segment.header.p_paddr
+	
+	# Workaround for LD aligning segments to a larger boundary than 8k.
+	if lma == 0x8000000:
+		lma += 0x2000
+		data = data[0x2000:]
+	
+	# Add padding if necessary.
+	buf += '\0' * (lma - 0x8002000 - len(buf))
+	
+	buf += data
+
+# Align to 64B
+if len(buf) & (64 - 1):
+	buf += '\0' * (64 - (len(buf) & (64 - 1)))
+
+# Add DFU suffix
+buf += struct.pack('<HHHH3sB',
+	0xffff,
+	0x5679,
+	0x1234,
+	0x0100,
+	'UFD',
+	16,
+)
+
+# Calculate CRC.
+buf += struct.pack('<I', ~zlib.crc32(buf) & 0xffffffff)
+
+open(outfile, 'w').write(buf)