mirror of
https://github.com/lingble/meta-tegra.git
synced 2025-10-29 19:42:41 +00:00
802f7d985c
with a function for concatenating DTBOs onto DTBs. Signed-off-by: Matt Madison <matt@madison.systems>
50 lines
1.7 KiB
Python
50 lines
1.7 KiB
Python
def concat_dtb_overlays(dtbfile, overlays, outfile, d):
|
|
"""
|
|
Produce an output DTB file that has zero or more
|
|
overlay DTBs concatenated to it, for processing by
|
|
NVIDIA's OverlayManager UEFI driver.
|
|
|
|
Source DTB and overlay files can reside either under
|
|
${EXTERNAL_KERNEL_DEVICETREE} or in ${DEPLOY_DIR_IMAGE}.
|
|
|
|
dtbfile: Main DTB file
|
|
overlays: space-separated list of zero or more DTBO files
|
|
outfile: name of output file
|
|
d: recipe context
|
|
"""
|
|
import os
|
|
import bb.utils
|
|
|
|
def find_file_under(fname, rootdir):
|
|
for dirname, _, f in os.walk(rootdir):
|
|
if fname in f:
|
|
return os.path.join(dirname, fname)
|
|
return None
|
|
|
|
def locate_dtb_files(dtbnames):
|
|
result = []
|
|
extern_root = d.getVar('EXTERNAL_KERNEL_DEVICETREE')
|
|
imgdeploydir = d.getVar('DEPLOY_DIR_IMAGE')
|
|
for dtb in dtbnames:
|
|
if os.path.isabs(dtb):
|
|
result.append(dtb)
|
|
continue
|
|
if extern_root:
|
|
dtbpath = find_file_under(dtb, extern_root)
|
|
if dtbpath:
|
|
result.append(dtbpath)
|
|
continue
|
|
result.append(os.path.join(imgdeploydir, dtb))
|
|
return result
|
|
|
|
infiles = locate_dtb_files([dtbfile] + overlays.split())
|
|
bb.note("Creating concatenated device tree: ", outfile)
|
|
with open(outfile, "wb") as outf:
|
|
for infile in infiles:
|
|
# the overlay manager expects all DTBOs to start
|
|
# on a 4K page boundary
|
|
outf.write(bytearray(int((outf.tell() + 4095) / 4096) * 4096))
|
|
bb.note(" Adding: ", infile)
|
|
with open(infile, "rb") as inf:
|
|
outf.write(inf.read())
|