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patman: Correct lz4 compression parameters

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>
Simon Glass 3 years ago
parent
commit
6deff872cf
1 changed files with 2 additions and 1 deletions
  1. 2 1
      tools/patman/tools.py

+ 2 - 1
tools/patman/tools.py

@@ -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)