修改内核logo

1.将我们准备好的 logo-linux.png 图片拷贝到drivers/video/logo 这个目录下

2.我们需要把 png 格式的图片转换成 ppm 格式，安装sudo apt-get install netpbm这个工具

3.创建linux_logo_png_to_ppm.sh脚本将png图片转换成ppm格式，脚本内容如下：

#!/bin/sh
rm logo_linux_clut224.c
rm logo_linux_clut224.opngtopnm logo-linux.png > logo-linux.pnm
pnmquant 224 logo-linux.pnm > logo-linux224.pnm
pnmtoplainpnm logo-linux224.pnm > logo_linux_clut224.ppm

chmod 777 linux_logo_png_to_ppm.sh

./linux_logo_png_to_ppm.sh

回到linux源码的根目录重新编译源码

make zImgae -j8

如果重新跑内核没有显示Logo：

1.图片尺寸超过了屏幕的分辨

2.检查设备树的LCD

增加开机进度条

linux内核启动的时候首先显示开机Logo，当"init"进程创建完成后，Linux从内核态切换到用户态，init程序通过/etc/inittab文件进行配置,进而执行/etc/init.d/rcS脚本，然后执行/etc/init.d/下的所有脚本开启相应的服务与功能。在执行执行/etc/init.d/下脚本开启服务的时候可能会比较耗时，因此在此阶段增加一个进度条可提示当前服务的开启情况。

1.下载 psplash 源码并解压

下载psplash：gitclone git://git.yoctoproject.org/psplash
tar -vxf psplash.tar.gz

psplash-poky.png和psplash-bar.png分别是显示的Logo和进度条

2.安装下面的库，否则编译会报错

sudo apt-get install libgdk-pixbuf2.0-dev

3.制作 autogen.sh 脚本，用于生成 Makefile,autogen.sh脚本内容如下

    #!/bin/bashaclocalautoheaderautomake --add-missingautoconf

chmod 777 autogen.sh

4.将logo-linux.png图片复制到psplash目录下

5.编写auto_generate.sh脚本一键自动生成paplash和psplash-write可执行文件，auto_generate.sh脚本内容如下

#!/bin/sh
rm psplash
rm psplash-write
cp logo-linux.png psplash-poky.png -f
./make-image-header.sh psplash-poky.png POKY
./make-image-header.sh psplash-bar.png BAR
./autogen.sh
./configure --host=arm-linux-gnueabihf
make

1.首先是删除psplash和psplash-write

2.将logo-linux.png重命名为psplash-poky.png

3../configure是配置交叉编译工具链

chmod 777 auto_generate.sh

./auto_generate.sh

最后将编译生成的 psplash 和 psplash-write 文件拷贝到开发板文件系统/usr/bin 目录下。

6.新建psplash.sh 脚本，并将其拷贝到开发板文件系统的/etc/init.d/目录下，psplash.sh 脚本内容如下

#!/bin/sh### BEGIN INIT INFO# Provides: psplash# Required-Start:# Required-Stop:# Default-Start: S# Default-Stop:### END INIT INFOread CMDLINE < /proc/cmdlinefor x in $CMDLINE; docase $x inpsplash=false)echo "Boot splashscreen disabled"exit 0;;;esacdoneexport TMPDIR=/mnt/.psplashmount tmpfs -t tmpfs $TMPDIR -o,size=40krotation=0if [ -e /etc/rotation ]; thenread rotation < /etc/rotationfi/usr/bin/psplash --angle $rotation &

chmod 777 psplash.sh

脚本最后执行psplash程序，传参当前屏幕的角度，psplash运行起来后刷Logo图片，创建管道文件阻塞等待psplash-write程序向管道文件中写入进度条更新命令参数

7.linux启动顺序执行/etc/inittab-->/etc/init.d/rcS。rcS内容如下

#!/bin/sh
#
# rcS       Call all S??* scripts in /etc/rcS.d in
#       numerical/alphabetical order.
#
# Version:  @(#)/etc/init.d/rcS  2.76  19-Apr-1999  miquels@cistron.nl
#PATH=/sbin:/bin:/usr/sbin:/usr/bin
runlevel=S
prevlevel=N
umask 022
export PATH runlevel prevlevel# Make sure proc is mounted
#
[ -d "/proc/1" ] || mount /proc#
#   Source defaults.
#
. /etc/default/rcS#
#   Trap CTRL-C &c only in this shell so we can interrupt subprocesses.
#
trap ":" INT QUIT TSTP#
#   Call all parts in order.
#
exec /etc/init.d/rc S

最后执行了/etc/init.d/下的rc脚本文件，传参S，rc文件内容如下

#!/bin/sh
#
# rc        This file is responsible for starting/stopping
#       services when the runlevel changes.
#
#       Optimization feature:
#       A startup script is _not_ run when the service was
#       running in the previous runlevel and it wasn't stopped
#       in the runlevel transition (most Debian services don't
#       have K?? links in rc{1,2,3,4,5} )
#
# Author:   Miquel van Smoorenburg <miquels@cistron.nl>
#       Bruce Perens <Bruce@Pixar.com>
#
# Version:  @(#)rc  2.78  07-Nov-1999  miquels@cistron.nl
#. /etc/default/rcS
export VERBOSEstartup_progress() {step=$(($step + $step_change))if [ "$num_steps" != "0" ]; thenprogress=$((($step * $progress_size / $num_steps) + $first_step))elseprogress=$progress_sizefiecho "PROGRESS is $progress $runlevel $first_step + ($step of $num_steps) $step_change $progress_size"if type psplash-write >/dev/null 2>&1; thenTMPDIR=/mnt/.psplash psplash-write "PROGRESS $progress" || truefi#if [ -e /mnt/.psplash/psplash_fifo ]; then#    echo "PROGRESS $progress" > /mnt/.psplash/psplash_fifo#fi
}#
# Start script or program.
#
startup() {# Handle verbosity[ "$VERBOSE" = very ] && echo "INIT: Running $@..."case "$1" in*.sh)# Source shell script for speed.(trap - INT QUIT TSTPscriptname=$1shift. $scriptname);;*)"$@";;esacstartup_progress
}# Ignore CTRL-C only in this shell, so we can interrupt subprocesses.trap ":" INT QUIT TSTP# Set onlcr to avoid staircase effect.stty onlcr 0>&1# Limit stack size for startup scripts[ "$STACK_SIZE" == "" ] || ulimit -S -s $STACK_SIZE# Now find out what the current and what the previous runlevel are.runlevel=$RUNLEVEL# Get first argument. Set new runlevel to this argument.[ "$1" != "" ] && runlevel=$1if [ "$runlevel" = "" ]thenecho "Usage: $0 <runlevel>" >&2exit 1fiprevious=$PREVLEVEL[ "$previous" = "" ] && previous=Nexport runlevel previous# Is there an rc directory for this new runlevel?if [ -d /etc/rc$runlevel.d ]then# Find out where in the progress bar the initramfs got to.PROGRESS_STATE=0#if [ -f /dev/.initramfs/progress_state ]; then#    . /dev/.initramfs/progress_state#fi# Split the remaining portion of the progress bar into thirdsprogress_size=$(((100 - $PROGRESS_STATE) / 3))case "$runlevel" in0|6)# Count down from -100 to 0 and use the entire barfirst_step=-100progress_size=100step_change=1;;S)# Begin where the initramfs left off and use 2/3# of the remaining spacefirst_step=progress_sizeprogress_size=$(($progress_size * 3))step_change=1;;*)# Begin where rcS left off and use the final 1/3 of# the space (by leaving progress_size unchanged)first_step=$(($progress_size * 2 + $PROGRESS_STATE))step_change=1;;esacnum_steps=0for s in /etc/rc$runlevel.d/[SK]*; docase "${s##/etc/rc$runlevel.d/S??}" ingdm|xdm|kdm|reboot|halt)break;;esac#遍历脚本的数量num_steps=$(($num_steps + 1))donestep=0# First, run the KILL scripts.if [ $previous != N ]thenfor i in /etc/rc$runlevel.d/K[0-9][0-9]*do# Check if the script is there.[ ! -f $i ] && continue# Stop the service.startup $i stopdonefi# Now run the START scripts for this runlevel.for i in /etc/rc$runlevel.d/S*do[ ! -f $i ] && continueif [ $previous != N ] && [ $previous != S ]then## Find start script in previous runlevel and# stop script in this runlevel.#suffix=${i#/etc/rc$runlevel.d/S[0-9][0-9]}stop=/etc/rc$runlevel.d/K[0-9][0-9]$suffixprevious_start=/etc/rc$previous.d/S[0-9][0-9]$suffix## If there is a start script in the previous level# and _no_ stop script in this level, we don't# have to re-start the service.#[ -f $previous_start ] && [ ! -f $stop ] && continueficase "$runlevel" in0|6)startup $i stop;;*)startup $i start;;esacdonefi#Uncomment to cause psplash to exit manually, otherwise it exits when it sees a VC switch
if [ "x$runlevel" != "xS" ] && [ ! -x /etc/rc${runlevel}.d/S??xserver-nodm ]; thenif type psplash-write >/dev/null 2>&1; thenTMPDIR=/mnt/.psplash psplash-write "QUIT" || trueumount -l /mnt/.psplashfi
fi

chmod 777 rc

rc脚本启动/etc/rcS.d下的所有脚本文件并更新进度条显示

1.将进度条分成3份

2.遍历/etc/rcS.d/目录下的Sxx脚本文件数量

3.从三分之一的地方开始走进度条，留三分之二来提示脚本的执行进度，每执行完一个脚本步进1，所有脚本执行完毕进度条走到尽头100%。

num_steps=10 脚本文件的数量
first_step=100/3=33 从三分之一的地方开始递增
progress_size=100/3*2=66 将三分之二的进度条分割为num_steps来走进度

progress=$((($step * $progress_size / $num_steps) + $first_step))
progress=$((($step * 66 / 10) + 33))

每执行一个脚本step++

如果需要从0%开始走进度到100%,修改first_step=0,progress_size=100

/etc/rcS.d/目录下的Sxx脚本其实都是/etc/init.d/目录下的软链接

按照Sxx文件的xx由小到大顺序执行脚本开启相应的服务

总结：psplash.sh脚本把psplash程序运行起来后，创建一个管道文件，阻塞等待rc脚本中通过psplash-write程序向管道中写入更新进度条的命令参数。

关于psplash是否显示提示文字和logo显示的位置可在psplash-config.h中配置

/**  pslash - a lightweight framebuffer splashscreen for embedded devices.**  Copyright (c) 2014 MenloSystems GmbH*  Author: Olaf Mandel <o.mandel@menlosystems.com>**  This program is free software; you can redistribute it and/or modify*  it under the terms of the GNU General Public License as published by*  the Free Software Foundation; either version 2, or (at your option)*  any later version.**  This program is distributed in the hope that it will be useful,*  but WITHOUT ANY WARRANTY; without even the implied warranty of*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the*  GNU General Public License for more details.**/#ifndef _HAVE_PSPLASH_CONFIG_H
#define _HAVE_PSPLASH_CONFIG_H/* Text to output on program start; if undefined, output nothing */
#define PSPLASH_STARTUP_MSG ""/* Bool indicating if the image is fullscreen, as opposed to split screen */
#define PSPLASH_IMG_FULLSCREEN 0/* Position of the image split from top edge, numerator of fraction */
#define PSPLASH_IMG_SPLIT_NUMERATOR 5/* Position of the image split from top edge, denominator of fraction */
#define PSPLASH_IMG_SPLIT_DENOMINATOR 6#endif

关于psplash进度条的颜色可在psplash-colors.h中配置

/**  pslash - a lightweight framebuffer splashscreen for embedded devices.**  Copyright (c) 2012 sleep(5) ltd*  Author: Tomas Frydrych <tomas@sleepfive.com>**  This program is free software; you can redistribute it and/or modify*  it under the terms of the GNU General Public License as published by*  the Free Software Foundation; either version 2, or (at your option)*  any later version.**  This program is distributed in the hope that it will be useful,*  but WITHOUT ANY WARRANTY; without even the implied warranty of*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the*  GNU General Public License for more details.**/#ifndef _HAVE_PSPLASH_COLORS_H
#define _HAVE_PSPLASH_COLORS_H/* This is the overall background color */
#define PSPLASH_BACKGROUND_COLOR 0xec,0xec,0xe1/* This is the color of any text output */
#define PSPLASH_TEXT_COLOR 0x6d,0x6d,0x70/* This is the color of the progress bar indicator */
#define PSPLASH_BAR_COLOR 0x6d,0x6d,0x70/* This is the color of the progress bar background */
#define PSPLASH_BAR_BACKGROUND_COLOR 0xec,0xec,0xe1#endif

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linux修改内核logo和增加开机进度条

修改内核logo

增加开机进度条

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