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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):
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"""
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Produce an output DTB file that has zero or more
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overlay DTBs concatenated to it, for processing by
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NVIDIA's OverlayManager UEFI driver.
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Source DTB and overlay files can reside either under
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${EXTERNAL_KERNEL_DEVICETREE} or in ${DEPLOY_DIR_IMAGE}.
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dtbfile: Main DTB file
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overlays: space-separated list of zero or more DTBO files
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outfile: name of output file
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d: recipe context
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"""
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import os
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import bb.utils
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def find_file_under(fname, rootdir):
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for dirname, _, f in os.walk(rootdir):
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if fname in f:
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return os.path.join(dirname, fname)
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return None
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def locate_dtb_files(dtbnames):
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result = []
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extern_root = d.getVar('EXTERNAL_KERNEL_DEVICETREE')
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imgdeploydir = d.getVar('DEPLOY_DIR_IMAGE')
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for dtb in dtbnames:
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if os.path.isabs(dtb):
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result.append(dtb)
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continue
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if extern_root:
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dtbpath = find_file_under(dtb, extern_root)
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if dtbpath:
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result.append(dtbpath)
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continue
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result.append(os.path.join(imgdeploydir, dtb))
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return result
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infiles = locate_dtb_files([dtbfile] + overlays.split())
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bb.note("Creating concatenated device tree: ", outfile)
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with open(outfile, "wb") as outf:
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for infile in infiles:
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# the overlay manager expects all DTBOs to start
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# on a 4K page boundary
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outf.write(bytearray(int((outf.tell() + 4095) / 4096) * 4096))
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bb.note(" Adding: ", infile)
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with open(infile, "rb") as inf:
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outf.write(inf.read())
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