Jubin Zhong
83c382f436
xz_wrap.sh use $SRCARCH to detect the BCJ filter. However, assigning arm BCJ filter to Thumb-2 kernel is not optimal. In my case, about 5% decrease of image size is observed with armthumb BCJ filter: Test results: hardware: QEMU emulator version 3.1.0 config: vexpress_defconfig with THUMB2_KERNEL & KERNEL_XZ on arm BCJ: 4029808 armthumb BCJ: 3827280 Choose armthumb BCJ filter for Thumb-2 kernel to make smaller images. Signed-off-by: Jubin Zhong <zhongjubin@huawei.com> Link: https://lore.kernel.org/lkml/1637323647-19988-1-git-send-email-zhongjubin@huawei.com/ Change-Id: I23c6e0fd2e54fdc84e78f122d6f4f06e54026696 Signed-off-by: Tao Huang <huangtao@rock-chips.com>
30 lines
653 B
Bash
Executable File
30 lines
653 B
Bash
Executable File
#!/bin/sh
|
|
#
|
|
# This is a wrapper for xz to compress the kernel image using appropriate
|
|
# compression options depending on the architecture.
|
|
#
|
|
# Author: Lasse Collin <lasse.collin@tukaani.org>
|
|
#
|
|
# This file has been put into the public domain.
|
|
# You can do whatever you want with this file.
|
|
#
|
|
|
|
. include/config/auto.conf
|
|
|
|
BCJ=
|
|
LZMA2OPTS=
|
|
|
|
case $SRCARCH in
|
|
x86) BCJ=--x86 ;;
|
|
powerpc) BCJ=--powerpc ;;
|
|
ia64) BCJ=--ia64; LZMA2OPTS=pb=4 ;;
|
|
arm) BCJ=--arm ;;
|
|
sparc) BCJ=--sparc ;;
|
|
esac
|
|
|
|
if [ -n "${CONFIG_THUMB2_KERNEL}" ]; then
|
|
BCJ=--armthumb
|
|
fi
|
|
|
|
exec $XZ --check=crc32 $BCJ --lzma2=$LZMA2OPTS,dict=32MiB
|