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patman: Correct lz4 compression parameters

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At present on large files, lz4 uses a larger block size (e.g. 256KB) than
the 64KB supported by the U-Boot decompression implementation. Also it is
optimised for maximum compression speed, producing larger output than we
would like.

Update the parameters to correct these problems.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2021-01-06 21:35:11 -07:00
parent 9fc6ebd8fe
commit 6deff872cf
1 changed files with 2 additions and 1 deletions
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3
tools/patman/tools.py
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@ -476,7 +476,8 @@ def Compress(indata, algo, with_header=True):
fname = GetOutputFilename('%s.comp.tmp' % algo)
WriteFile(fname, indata)
if algo == 'lz4':
data = Run('lz4', '--no-frame-crc', '-c', fname, binary=True)
data = Run('lz4', '--no-frame-crc', '-B4', '-5', '-c', fname,
binary=True)
# cbfstool uses a very old version of lzma
elif algo == 'lzma':
outfname = GetOutputFilename('%s.comp.otmp' % algo)