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Detect if DTB is placed in second area of Android boot image (!1828)

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postmarketOS/pmaports!700 adds a new "deviceinfo_bootimg_dtb_second"
option that places the DTB in the "second" area of the Android boot
image.

Attempt to detect this automatically by checking the extracted
second binary for the FDT magic (0xd00dfeed).
This commit is contained in:
lambdadroid 2019-10-25 17:07:08 +02:00
parent cf9d648ac9
commit 67b080b158
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GPG key ID: 5AE7F5513E0885CB
6 changed files with 32 additions and 3 deletions
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9
pmb/parse/bootimg.py
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@ -21,6 +21,14 @@ import logging
import pmb
def is_dtb(path):
if not os.path.isfile(path):
return False
with open(path, 'rb') as f:
# Check FDT magic identifier (0xd00dfeed)
return f.read(4) == b'\xd0\x0d\xfe\xed'
def bootimg(args, path):
if not os.path.exists(path):
raise RuntimeError("Could not find file '" + path + "'")
@ -77,6 +85,7 @@ def bootimg(args, path):
output["cmdline"] = f.read().replace('\n', '')
output["qcdt"] = ("true" if os.path.isfile(bootimg_path + "-dt") and
os.path.getsize(bootimg_path + "-dt") > 0 else "false")
output["dtb_second"] = ("true" if is_dtb(bootimg_path + "-second") else "false")
# Cleanup
pmb.chroot.root(args, ["rm", "-r", temp_path])