Kernel Porting

1
Kernel Porting

• Lecture 7

2
? ?

• ??????? ?? ??
• Kernel Porting Overview
• ARM Patch
• Xscale Patch
• PXA255-PRO3 Board Patch
• Kernel Configuration Compiling
• Kernel fusing Testing

3
???? ??? ?? ?? ?? 1 ????
4
???? ??? ?? ?? ?? 2 ??(Google)
5
???? ??? ?? ?? ?? 3 Paradigm Shift
Linux
Win CE
Ports
Tool-chain
Networks
GUI
Mobile
Network
GUI
Networks
ex) ???, ??? ????
ex) ? ?????, ??
6
Kernel Porting Overview (1)

• Kernel Porting
• ??? ??? ?? ?? ??? ???? ?? ? ?? ??? ?? ???? ??
• ?? ??
• H/W-dependent
• CPU porting
• Board porting
• H/W-independent
• Linux kernel? ?? ??
• ?? ? ??
• ?? ?? ??? ????
• ?? ??

Application
H/W-indep.
Linux Kernel
H/W-dep.
Hardware
7
Kernel Porting Overview (2)

• Kernel Porting ??

8
ARM Core Patch (1)

• Linux kernel ??
• http//www.kernel.org/
• ??? ??? ??? ??? ??? ????? ?????? ????
• ? linux-2.6.21.tar.gz
• linux-2.4.19.tar.gz
• ARM Core Patch ??
• ARM core patch? ARM??? ???? ??? ?? 2.6? ?? ? ??
  ???? ??
• ??? ?? 2.4(e.g, linux-2.4.19)? ?? ??
• http//www.arm.uk.linux.org/
• ??? ????? ??? ??? ARM core patch ??? ?????? (e.g,
  patch-2.4.19-rmk4.gz)

9
ARM Core Patch (2)

• ARM Core Patch ??
• pwd
• /home/pxa255-pro3/kernel
• ls
• linux-2.4.19.tar.gz patch-2.4.19-rmk4.gz
• tar xvfz linux-2.4.19.tar.gz
• cd /home/pxa255-pro3/kernel/linux-2.4.19
• zcat ../patch-2.4.19-rmk4.gz patch p1
• (or
• gunzip d ../patch-2.4.19-rmk4.gz
• patch p1 lt patch-2.4.19-rmk4 )

10
Xscale Patch (1)

• Xscale Patch ???
• ?? ???? ???? CPU Xscale PXA255 processor
• ??? processor? SoC processor? ARM core ??? ??
  ???? ????? ??, ??? ???? I/O ??? ??
• ???? ???? ?? kernel patch? ??
• Xscale Patch ??
• ?? processor? ?? patch? ?? ?????? ?? ??
• Xscale patch? nico?? ????? ??
• ftp//ftp.arm.uk.linux.org/pub/linux/arm/people/ni
  co/v.2.4
• ??? ????? ??? ??? Xscale patch ??? ?????? (e.g,
  diff-2.4.19-rmk4-pxa2.gz)

11
Xscale Patch (2)

• Xscale Patch ??
• pwd
• /home/pxa255-pro3/kernel
• ls
• diff-2.4.19-rmk4-pxa2.gz linux-2.4.19
• linux-2.4.19.tar.gz patch-2.4.19-rmk4.gz
• cd /home/pxa255-pro3/kernel/linux-2.4.19
• zcat ../diff-2.4.19-rmk4-pxa2.gz patch p1
• (or
• gunzip d ../diff-2.4.19-rmk4-pxa2.gz
• patch p1 lt diff-2.4.19-rmk4-pxa2 )

12
PXA255-PRO3 Board Patch (1)

• Board Patch ??
• ?? ???? ???? ?? I/O ?? ? ?????? ?? kernel patch
• ?
• Board description
• Ethernet I/F
• LCD display
• USB
• PCMCIA, CF, SD I/F etc.
• ?? ?? ?????? ??

13
PXA255-PRO3 Board Patch (2)

• Board Patch ??
• ??? ???? ??? CD-ROM?? ?? board patch ??? ???? ??
• ? diff-2.4.19-rmk4-pro3.gz
• Board Patch ??
• pwd
• /home/pxa255-pro3/kernel
• cd /home/pxa255-pro3/kernel/linux-2.4.19
• zcat ../diff-2.4.19-rmk4-pro3.gz patch p1
• (or
• gunzip d ../diff-2.4.19-rmk4-pro3.gz
• patch p1 lt diff-2.4.19-rmk4-pro3 )

14
Kenel Compiling (1)

• Kernel image making
• Kenel Configuration ? Kernel Compiling
• Kernel Configuration
• ?? ??? ??? linux kernel? ??, ?? ?? ? ???? ??
• ? ?? ??? ???? linux kernel ??? ??
• ?? ??? ?? ???, ???? ??, module? ????? ??
• ?? ?? make menuconfig
• Kernel Compiling
• ?? ??? ?? ?? ??? ????? ?? ???? ??
• ?? ?? make dep
• make zImage

15
Kenel Compiling (2)

• Kernel image making ??
• pwd
• /home/pxa255-pro3/kernel
• cd /home/pxa255-pro3/kernel/linux-2.4.19
• make pro3_config // default configuration ??
• // ?? ??? ?? ???? ?? ? ??
• make oldconfig
• (or make menuconfig // default config.? ????? ?
  ?.)
• make clean // make distclean
• make dep
• make zImage

16
Kenel Fusing

• Kernel Fusing
• ??? ??? ?? ???? u-boot bootloader ????? ?? ?? ???
  ??? ???? ????
• ?? ??? ??-5 ??? ??

17
PXA255-PRO3 Board ?? (1)

• PXA255-PRO3 Board Patch ??
• ?? ???? ?? ??? linux-2.4.21??, ?? ?? kernel patch
  compiling? ????.
• Step 1 ?? ?? ??
• http//www.kernel.org/ ????? ?? ??
  linux-2.6.21.tar.gz? ??????
• ?? ?? ??? ????
• tar xvfz linux-2.6.21.tar.gz
• Step 2 PXA255-PRO3 board patch ??
• PXA255-PRO3 board patch ?? diff-2.6.21-pxa255-pro3
  .gz? ????

18
PXA255-PRO3 Board ?? (2)

• PXA255-PRO3 Board Patch ?? (contn)
• Step 3 Board patch ??
• cd /pxa255-pro3/kernel/linux-2.6.21
• ls ../diff-2.6.21-pxa255-pro3.gz
• diff-2.6.21-pxa255-pro3.gz
• zcat ../ diff-2.6.21-pxa255-pro3.gz patch
  p1
• Step 4 Kernel compiling
• pwd
• /home/pxa255-pro3/kernel/linux-2.6.21
• make pro3_defconfig
• make oldconfig
• make uImage

19
PXA255-PRO3 Board ?? (3)

• PXA255-PRO3 Board Patch ?? (contn)
• Step 5 Kernel image ?? ?? ??
• ?? board patch??? ?? ??? ?? ?? ????
  /tftpboot/pxa255_pro3/uImage-2.6.21-pro3? ????
• ls ???? ?? ??? ?? ???? ????
• ls al /tftpboot/pxa255_pro3
• Step 6 Kernel fusing
• ?? ??? ???? u-boot? command mode? ????
• ?? ??? ???? ?? ??? ?? ? ????
• PRO3gt printenv
• ??? ????
• PRO3gt run linuxf

20
?? Menuconfig flow
make pro3_defconfig
make menuconfig
cd include ln -sf asm-arm asm
lxdialog compile
script/Menuconfig
arch/arm/config.in
.config ?
no
arch/arm/defconfig
yes
lxdialog
Configuration
.tmpconfig , .tmpconfig.h
mv .tmpconfig.h include/linux/autoconf.h
exit
mv .tmpconfig .config
21
?? Patch file ???

• Patch file
• Patch file? ? ???? ?????? ???? ????? ????? diff?
  ?? ???? ??? ??.
• ????? ?????? ???? ???? ??.
• ??? ??, Version up ?? ??

22
?? Patch file ???(cont)

• diff ???

hello.c
hello2.c
include ltstdio.hgt int main(void)
printf("hello world!!!\n") return 0
include ltstdio.hgt int main(void)
printf("hello world!!!\n") printf("hello
bedguy!!!\n") return 0
root_at_bedguy /root diff -uNr hello.c hello2.c gt
hello.patch root_at_bedguy /root cat
hello.patch --- hello.c Thu Aug 30 140805
2001 hello2.c Thu Aug 30 140654 2001 _at__at_
-2,6 2,7 _at__at_ int main(void)
printf("hello world!!!\n") printf("hello
bedguy!!!\n") return 0
root_at_bedguy /root
Org file
New file
Patch file
23
?? Patch file ???(cont)

• Patch ??
• -p option
• p1 - ??? ???? ? ??? Patch ??(?? ???? ??)
• p0 ? ?? ???????? ??(?? ?? ??)

root_at_bedguy /root cat hello.patch patch
-p0 root_at_bedguy /root cat hello.c include
ltstdio.hgt int main(void)
printf("hello world!!!\n")
printf("hello bedguy!!!\n") return 0
root_at_bedguy /root
24
?? Link

• http//www.arm.linux.org.uk/ The ARM Linux
  Project
• http//www.netwinder.org/ netwinder
• http//handhelds.org/ IPAQ ??
• http//www.cs.cmu.edu/wearable/software/ The
  Wearable Group
• http//www.lart.tudelft.nl The LART Pages
• http//www.kelp.or.kr/ Korea Embedded Linux
  Project
• http//www.kesl.org/ Korea Embedded System og
  Linux
• http//www.huins.com/ Huins, Co.
• http//linux.flyduck.com/ Kernel site
• http//kernelkorea.org/ Linux kernel
• http//www.linuxro.com/ ecos porting
• http//pcmcia-cs.sourceforge.net/ Linux PCMCIA
  Information Page
• http//ftp.arm.linux.org.uk/ The ARM Linux
  Project FTP
• http//www.kr.ibm.com/developerworks/ ?? ??
• http//www.freechal.com/embedded/ ???? ??? ???
  ??
• http//www.fsf.org/ gnu homepage
• http//www.phystech.com/download/ server demon
  program