From: Simon Glass <sjg@chromium.org>
Date: Thu, 7 Jan 2021 04:35:11 +0000 (-0700)
Subject: patman: Correct lz4 compression parameters
X-Git-Url: http://git.dujemihanovic.xyz/?a=commitdiff_plain;h=6deff872cf7ac25bf3d67066b57e7831cd560e5b;p=u-boot.git

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>
---

diff --git a/tools/patman/tools.py b/tools/patman/tools.py
index d8e01a3e60..10997e4386 100644
--- a/tools/patman/tools.py
+++ b/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)