AN10389 Getting started uClinux with LPC22xx
Contents
1. 4 root mylinux uClinux gzip dc incoming uClinux dist lpc22xx patch gz patch p0 NXP B V 2007 All rights reserved Application note Rev 01 15 February 2007 5 of 23 NXP Semiconductors AN1 0389 AN10389_1 2 4 2 5 Getting started uClinux with LPC22xx The patch is for the new vendor product item The result 5 root mylinux uClinux dist cd uClinux dist vendors 6 root mylinux vendors cd Philips LPC22xx 7 root mylinux LPC22xx ls 8 config arch config uClibc inittab motb re 9 eontig lLinus 2 6 config vendor Makefile passwd 3 3 Others Since linux 2 6 10 and later version the armnommu and arm architecture are combined user need modify file below uClinux dist vendosr config armnommu config arch line 41 from ARCH armnommu to ARCH arm An overview of the uClinux source code tree is shown in Fig 1 uClinux dist configuration files for buid miscellaneous documents i the older uC libc Documentation uClinux 2 0 uClinux 2 4 uClinux 2 6 Linux 2 6 x init kernel arch fs drivers etc tools for romfs etc the newer uClibc application programs vendors Fig 1 uClinux source code tree Get and install cross toolchain 1 Get ARM ELF toolchain Since the linux 2 6 kernel code uses some new features of newer binutils you need a newer ARM ELF toolchain for kernel compilation than the one on the http www nxp com e2. Apr 27 22 13 linux text 1 rw r r root root 789504 Apr 27 22 13 romfs img root mylinux uClinux dist ls al linux 2 6 x linux rwxr xr x 2 root root 499433 Apr 27 22 11 linux 2 6 x linux rwxr xr x 2 root root 15499433 Apr 27 22 11 linux 2 6 x linux bin If you get the same files you ve the whole kernel and rootfs image The linux bin is the kernel image while the large file linux includes the debugging symbols The romfs img is the file system image linux bin and romfs img are the target images that will be programmed and run in the target board 5 Load image AN10389_1 5 1 5 1 1 Before loading Before loading Linux kernel and file system images let s do some base jobs and know some general knowledge Interrupt vector table For LPC22xx the interrupt vectors can be mapped to different memory space The 4 mapping modes are controlled by the MEMMAP register of LPC22xx boot block internal Flash intenal RAM or external memory For details about mapping The Linux system will generate its own interrupt vector table at the beginning address of SRAM automatically E g 0x8100 0000 So we need to set up a direct link from LPC22xx interrupt vectors to Linux system interrupt vectors User should program some code at internal or external flash and make it direct to Linux interrupt vector table E g CODE32 AREA vectors CODE READONLY ENTRY Reset LDR PC ResetAddr LDR PC UndefinedAddr LDR
3. Vendor User settings is for configuration of applications and libraries configuration for making the romfs img which will be the root file system of the kernel With the final Update Default Vendor settings your changes on the kernel and user application configuration will be saved on the vendors product directory In your developing or debugging stage you can toggle the Kernel Settings and or User Settings only You can go back to main menu with esc key or Exit button and do again for saving dialog And save it NXP B V 2007 All rights reserved Application note Rev 01 15 February 2007 9 of 23 NXP Semiconductors AN1 0389 Getting started uClinux with LPC22xx 3 2 Kernel configuration If you follow the steps in confirm the configuration files above your kernel should get configured Let s have a look at some related configuration items as shown in Fig 6 ysten Type Fig 6 Linux kernel configuration menu In the System Type option the SRAM FLASH base address and size the Oscillator Frequency Fosc should be consistent with your board The ARM Core Clock Fcclk is your target CPU frequency AN10389_1 NXP B V 2007 All rights reserved Application note Rev 01 15 February 2007 10 of 23 NXP Semiconductors AN1 0389 Getting started uClinux with LPC22xx ARM system type Philips LPC22xx gt ks electo Fig 7 System type
4. porting instead of creating NXP B V 2007 All rights reserved Application note Rev 01 15 February 2007 20 of 23 NXP Semiconductors AN1 0389 Getting started uClinux with LPC22xx To develop the Ethernet driver of RTL8019AS which is NE2000 compatible we can find the related source files here uClinux dist linux 2 6 x drivers net ne c 8390 c 8390 h By providing some basic information the SFR startup address interrupt number etc we can get the new RTL8019AS Ethernet driver for our own board 7 2 Develop user applications On how to develop user application program there is a pretty good user guide under the Documentation directory of uClinux source code tree uClinux dist Documentation Adding User Apps HOWTO By following the document step by step we can create and run our first Hello the world program in 1 hour 7 3 Debugging 7 3 1 Debug OS kernel and device driver There are several ways to debug uClinux kernel and device driver program E g 1 AXD MultilCE MultilCE Server AXD ADS Debugger by ARM company running under Windows environment MultilCE ARM Emulator by ARM company parallel port interface to PC and JTAG interface to the board MultilCE Sever driver program for MultiICE running under Windows environment 2 arm elf gdb insight MultilCE gdb server MultilCE MultilCE Server arm elf gdb insight GNU cross debugger for ARM architecture running under Linux enviro
5. warranty that such applications will be suitable for the specified use without further testing or modification 8 3 Trademarks Notice All referenced brands product names service names and trademarks are property of their respective owners NXP B V 2007 All rights reserved Application note Rev 01 15 February 2007 22 of 23 NXP Semiconductors AN10389 Getting started uClinux with LPC22xx 9 Contents 1 Introduction cccseeteeesseeeeeenseeeeenseeeneneeeeeennseneenees 3 1 1 About UCIINUX 200 eeeeeeeeeeeeeeeeeeeeeeneeeseneeeneeeteneeeaees 3 1 2 About LPC22XX ooo eeececceeeesseceeeeeeeeeeeneeeeesseeessseeeees 3 1 3 UCIiNUX for LPC22XxX ce eeeeeeeeeeeeeeeteneeeeeeeteneeeneete 3 2 Setup ENViIrONMEN eeeceseeeeeeeeeseeeeeeeeeseeeeeees 3 2 1 Install Linux on the PC eceeeeeeeseeeeeeeteteeteneetenes 3 2 2 Grab source Code packageS ceceeeeeeeeeeeeeees 4 2 3 Make source code tree eerren 4 2 4 Get and install cross toolchain sceeeeeeeee 6 2 5 Hardware platform seseeeeesneeeeesseeeeeeneeeeeenees 6 3 System CONFIQUIATION cceceseeeseeseeeeeteeeeeeees 7 3 1 Distribution Configuration cececeeseseseeeeees 7 3 2 Kernel Configuration cccceeseseeeeeseteneeeeneers 10 3 3 Application library configuration 14 4 Build iMAage eseeteeessseeeeesseeeeensseeeenseeeeensseeeennees 14 4 1 Makerien reiini n ea ER E 14 4 2 The r SU
6. AN1 0389 AN10389_1 Getting started uClinux with LPC22xx drwxr xr x 28 root root 4096 Apr 27 20 32 rw r r 1000 users 18007 Apr 8 09 13 COPYING drwxr xr x 3 1000 users 4096 Apr 8 09 13 Documentation rw r r 1000 users 9305 Apr 8 09 13 Makefile Yw r r 1000 users 4934 Apr 8 09 13 README rw r r 1000 users 1743 Apr 8 09 13 SOURCE drwxr xr x 2 1000 users 4096 Apr 15 15 19 bin drwxr xr x 3 1000 users 4096 Apr 8 09 27 config lt the configuration files for userland and etc drwxr xr x 11 1000 users 4096 Apr 8 09 27 freeswan lt IPsec implementation drwxr xr x 68 1000 users 4096 Apr 8 09 23 glibc lt Yes the GNU C library drwxr xr x 18 1000 users 4096 Apr 8 09 28 lib lt many libraries ported to uClinux include uC libc 5 1000 users 4096 Apr 8 09 27 linux 2 0 x lt uClinux 2 0 x kernel drwxr xr x 16 1000 users 4096 Apr 8 09 27 linux 2 4 x lt uClinux 2 4 x kernel drwxr xr x 18 1000 users 4096 Apr 8 09 27 linux 2 6 x lt uClinux 2 6 x kernel drwxr xr x 3 1000 users 4096 Apr 8 09 26 tools lt utilities for romfs install and etc drwxr xr x 17 1000 users 4096 Apr 8 09 27 uClibc lt the uClibc from uclibc org Differ to uC libc drwxr xr x 174 1000 users 4096 Apr 8 09 27 user lt the userland The applications that is ported drwxr xr x 44 1000 users 4096 Apr 8 09 27 vendors lt the configuration files for each vendor models drwxr xr x 2 Make a new linux 2 6 x kernel fr
7. AN10389 Getting started uClinux with LPC22xx Rev 01 15 February 2007 Document information Application note Info Content Keywords uClinux ARM LPC22xx Abstract This application note describes how to use uClinux on NXP s LPC22xx series ARM MCU setup Linux environment system configuration build and load image files as well as simple introduction on uClinux development founded by Philips NXP Semiconductors AN1 0389 Getting started uClinux with LPC22xx Revision history Rev Date Description 01 20070215 Initial version Contact information For additional information please visit http Avww nxp com For sales office addresses please send an email to salesaddresses nxp com AN10389_1 NXP B V 2007 All rights reserved Application note Rev 01 15 February 2007 2 of 23 NXP Semiconductors AN1 0389 Getting started uClinux with LPC22xx 1 Introduction 1 1 1 2 1 3 About uClinux uClinux Micro C Linux is a Linux derivative intended for microcontrollers without Memory Management Unit MMU It s free and open source software under GNU Public License uClinux as an operation system includes Linux kernel releases for 2 0 2 4 and 2 6 as well as a collection of user applications libraries and tool chains The uClinux is much much smaller than Linux kernel while retaining the main advantages of Linux OS stability superior network capability and excellent
8. ItS cccccceeeeeeceeeeeeeeeeeeseceaeeeeeeeeeseeneeeees 14 5 Load iMage ssssssssusssnnnnnnnnnnennnnnnnnnnnnnnnnnnnnnnnnnnna 15 5 1 Before loading eeeseeeeeeneeeeeenneeeeeeeeeeseeeeeeeas 15 5 1 1 Interrupt vector table oe eee eeeeseeeeeeneeeeeeeee 15 5 1 2 100 0 0 re 16 5 2 Load to RAM isis kiitos 16 5 3 Load TO tlaSh posses tes eseina pads daceeedeecennseeceesvacn cece 17 5 4 Memory layout eeeeeceeeseeeeeenneeeeeneeeeeeneeeeeeas 17 6 Start Up UCIINUX ccccceseeeseeesseeeeseeeseeeeeseeeeeees 17 6 1 Run uClinux on the b0ard eeceseeeeeeeeeeeeneees 17 6 2 UCIINUX startup PLOCESS cee eeeeeeeeeeeeeeeeteeeeneees 20 7 UCIINUX development seeceeceseeeeeetenseeeeeteees 20 7 1 Develop device drivers escenes 20 7 2 Develop user applications s 21 7 3 DGDUGQING iscinscebisseecatasecsaduesttessipeegssondsunasdeaesited 21 7 3 1 Debug OS kernel and device driver 205 21 7 3 2 Debug application program esseere 21 8 Legal information cssssessseeeessseeeensseeneenees 22 8 1 PD STIIMIONS aeaee a 22 8 2 DiSCIAIMELS 22 ccccceeeeeeeeeeenneeeeeeeeeseetteeeeeeeteees 22 8 3 TRAQGIMANKS iiinis niriana oraria 22 9 COMOMS aia cscs cst cvecces cacesceceseecnececeectaseececessessecesss 23 founded by Please be aware that important notices concerning this document and the product s described herein have been included in the section Legal information NX
9. P B V 2007 All rights reserved For more information please visit http www nxp com For sales office addresses email to salesaddresses nxp com Date of release 15 February 2007 Document identifier AN10389_1
10. PC SWI_Addr LDR PC PrefetchAddr LDR PC DataAbortAddr DCD Oxb9205f80 LDR PC IRQ Addr LDR PC FIQ_ Addr ResetAddr DCD ResetInit UndefinedAddr DCD 0x81000004 SWI_Addr DCD 0x81000008 PrefetchAddr DCD 0x8100000c DataAbortAddr DCD 0x81000010 Nouse DCD 0 IRQ_Addr DCD 0x81000018 FIQ_Addr DCD 0x8100001c NXP B V 2007 All rights reserved Application note Rev 01 15 February 2007 15 of 23 NXP Semiconductors AN1 0389 AN10389_1 5 2 Getting started uClinux with LPC22xx Bootloader Bootloader is an independent part from OS kernel which will do necessary jobs before kernel booting Necessary system initialization Load uClinux images to specific position Jump to kernel start and run Bootloader is the very first program launched before uClinux kernel startup Besides the above basic functions a bootloader can be designed with more capabilities as Transfer kernel parameters from bootloader to kernel Download image files from PC to board Program board flash Initialize some peripheral devices for better debugging UART Ethernet interface etc Etc A user can design his or her own bootloader to implement basic function or to port some powerful bootloaders e g U Boot blob vivi lilo etc Here is a popular U boot website for reference which is a combination of PPCBoot and ARMBoot and is quite suitable for PowerPC and ARM CPU families http www nxp com external sourceforge proje
11. _1 Application note Rev 01 15 February 2007 13 of 23 NXP Semiconductors AN1 0389 Getting started uClinux with LPC22xx Fig 11 File systems menu econd extended fs support 3 3 Application library configuration On this menu you don t need fix anything for now Look around the configurations and simply exit and save Only a kindly prompt that you can see an item Miscellaneous Applications gt hello When you try to develop an application program hello it will appear here To toggle it will make it to be executable command of your uClinux system 4 Build image AN10389_1 4 1 4 2 Make We are ready to make the whole bunch Simply type root mylinux uClinux dist make For linux 2 4 x you should do make dep before make But linux 2 6 x don t need to It will compile the whole kernel and uClibc user applications and make the image files The results You should get the files in the image directory like root mylinux uClinux dist ls al images total 3036 drwxr xr x 2 root root 4096 Apr 27 22 13 NXP B V 2007 All rights reserved Application note Rev 01 15 February 2007 14 of 23 NXP Semiconductors AN1 0389 Getting started uClinux with LPC22xx drwxr xr x 17 1000 users 4096 Apr 27 22 13 rw r r 1 root root 1540272 Apr 27 22 13 image bin rwxr xr x 1 root root 45912 Apr 27 22 13 linux data rwxr xr x 1 root root 704856
12. ase refer the LPC22xx user manual To program external flash we can adopt below methods By parallel flash programmer hardware for off board programming By Jtag interface and Wringler or In Circuit Emulator By Ethernet interface By USB interface For the latter 3 methods there will have related software running on PC and connect PC with board by corresponding interface The software would be different according to your flash vendor and part no Memory layout The generated image files as well as bootloader will be programmed to board flash Bootloader will lead the system and start up from board flash Then the uClnux kernel can be started from flash directly or copied to RAM area for better speed performance Usually the memory size needed for uClinux system is as e Minima Flash 2 MB RAM 2 MB Minima means that only the uClinux kernel and necessary root file system can run If the images are compressed to flash the minimum flash size can be less to 512 kB e Typical Flash 4 MB RAM 4 MB A Typical system can include more than 1 file system Ethernet driver LCD driver and some commonly used device drivers For video audio or some complicated systems they can take more memory space 6 Start up uClinux AN10389_1 6 1 Run uClinux on the board If you have written the bootloader as well as uClinux kernel and file system images into the flash you are ready to run uClinux on your boa
13. cations 11 root mylinux uClinux dist make menuconfig Distribution configuration At the first Main Menu Select the Vendor Product Selection as shown in Fig 3 NXP B V 2007 All rights reserved Application note Rev 01 15 February 2007 7 of 23 NXP Semiconductors AN1 0389 Getting started uClinux with LPC22xx Vendor Product Selection gt z ki a Select Fig 3 Main menu Select Philips for the Vendor and LPC22xx for the Philips Products see Fig 4 VentoS On BeFeQTEON Select the Vendor you wish to target W Fig 4 Vendor product selection menu AN10389_1 NXP B V 2007 All rights reserved Application note Rev 01 15 February 2007 8 of 23 NXP Semiconductors AN1 0389 Getting started uClinux with LPC22xx You can go back to main menu with esc key or Exit button At the Main Menu Select the Kernel Library Defaults Selection And Select linux 2 6 x for the Kernel Version and uClibc for the Libc version And toggle the whole menus shown in Fig 5 Fig 5 Kernel library defaults selection menu pdate Default Vendor Settings AN10389_1 With the first default all settings the configuration files in the vendors directory is loaded With the second Customize kernel settings we can edit the kernel configuration The third Customize
14. cts u boot We can also download a uClinux bootloader for LPC22xx by a German developer http www nxp com external ulrichradig Load to RAM Usually in the debugging stage the kernel and fs will be loaded to external SRAM Some registers should be initialized before loading e g PINSEL BCFG MEMMAP etc Load uClinux kernel and fs image to specified address Jump to kernel start address and run Here using the ADS environment as example Open System Views gt Command Line Interface in the AXD debugger and type ob d ess config ini in the window Below is the content of config ini file setmem 0xE002C000 0x80000005 32 setmem 0xE002C014 0x0f814924 32 setmem OxFFEO0000 0x2000aeef 32 setmem OxFFEO0004 0x20007c67 32 setmem OxFFEO0008 0x1l000ffef 32 setmem OxFFEO000c O0x0000ffef 32 setmem OxEO1FC040 0x01 8 lb d ess linux bin 0x81008000 lb d ess romfs img 0x81200000 pc 0x81008000 xr NXP B V 2007 All rights reserved Application note Rev 01 15 February 2007 16 of 23 NXP Semiconductors AN1 0389 Getting started uClinux with LPC22xx 5 3 Load to flash 5 4 After the debugging stage we need manage to program the bootloader and uClinux images to flash uClinux kernel and fs images must be programmed to external flash The bootloader can be written either into internal or external flash There are three ways to program LPC22xx internal flash ISP IAP and parallel programmer For details ple
15. ed development a PC Linux environment is necessary To setup Linux environment there are 3 ways 1 Setup Linux on PC Buying distribution CD R or downloading Linux images from website e g Red Hat Linux 9 0 on http Awww nxp com external redhat and then install Linux on your PC according to its installation guide step by step By configuring you can get a dual boot system Windows and Linux Please be sure there is enough memory space on your PC beforehand NXP B V 2007 All rights reserved Application note Rev 01 15 February 2007 3 of 23 NXP Semiconductors AN1 0389 AN10389_1 2 2 2 3 Getting started uClinux with LPC22xx This way is suitable for single users 2 Telnet to Linux server through intranet To setup a Linux server is a good way for group users The telnet utility Cuteftp secureCRT etc can be obtained from internet free 3 Using Cygwin Cygwin is a Linux like environment for Windows which can be downloaded from Cygwin s website located at http Awww nxp com external cygwin It can be used in small application development or quick verification Usually Cygwin is not recommended for formal uClinux Linux development Grab source code packages To begin your first step on uClinux development below is the list that you have to grab on your Linux PC 1 uClinux distribution The easiest way to get started with uClinux is to download a copy of uClinux dist from the uClinux org si
16. file system support For more about uClinux refer to its official website via http www nxp com external uclinux About LPC22xx The 16 bit 32 bit LPC2000 family is based on a 1 8 V ARM7TDMI S core operating at up to 60 MHz together with a wide range of peripherals including multiple serial interfaces 10 bit ADC and external bus options LPC22xx series have configurable external memory interface with up to four banks each up to 16 MB and 8 16 32 bit data width With their 144 pin package low power consumption various 32 bit timers 8 channel 10 bit ADC PWM channels and up to 9 external interrupt pins these microcontrollers are particularly suitable for industrial control medical systems access control and point of sale Number of available GPIOs ranges from 76 with external memory through 112 pins single chip For more about the LPC22xx refer to the microcontrollers section of the NXP website http www nxp com products microcontrollers uClinux for LPC22xx Since its release in 1998 uClinux has supported wide range of CPU architectures as M68K ARM PowerPC V850 etc LPC22xx is based on supported ARM7 processor While with up to 64 MB external memory available LPC22xx can fit for the relative big memory requirement of uClinux 2 MB at least Note that LPC21xx series can t run uClinux since its limited internal memory size 2 Setup environment AN10389_1 2 1 Install Linux on the PC To begin uClinux bas
17. have no liability for the consequences of use of such information 8 2 Disclaimers General Information in this document is believed to be accurate and reliable However NXP Semiconductors does not give any representations or warranties expressed or implied as to the accuracy or completeness of such information and shall have no liability for the consequences of use of such information Right to make changes NXP Semiconductors reserves the right to make changes to information published in this document including without limitation specifications and product descriptions at any time and without notice This document supersedes and replaces all information supplied prior to the publication hereof AN10389_1 Suitability for use NXP Semiconductors products are not designed authorized or warranted to be suitable for use in medical military aircraft space or life support equipment nor in applications where failure or malfunction of a NXP Semiconductors product can reasonably be expected to result in personal injury death or severe property or environmental damage NXP Semiconductors accepts no liability for inclusion and or use of NXP Semiconductors products in such equipment or applications and therefore such inclusion and or use is for the customer s own risk Applications Applications that are described herein for any of these products are for illustrative purposes only NXP Semiconductors makes no representation or
18. ication note Rev 01 15 February 2007 NXP B V 2007 All rights reserved 19 of 23 NXP Semiconductors AN1 0389 Getting started uClinux with LPC22xx 6 2 uClinux startup process Fig 12 can give you a rough idea about uClinux internal startup process for your reference Check processor id OK Jump to C code start_kernel Print Linux version info Interrupt init Load device drivers Mount file systems Start init process Start Shell Enter into Idle state wait for new command Error Start Dead loop System initialization PLL SP MEMMAP etc Decompress Image Load Image Jump to uClinux kernel and transfer parameters BootLoader Kernel Fig 12 uClinux start up process 7 uClinux development AN10389_1 7 1 This section gives a brief introduction on how to develop device driver how to develop user applications and how to do debugging based on the established uClinux development platform Develop device drivers To develop user specific device drivers here are some references e Documents uClinux dist linux 2 6 x Documentation driver model e Classical book Linux Device Driver the 2 edition by O REILLY Actually the more handy way is to find some similar or related device drivers under the source code directory uClinux dist linux 2 6 x drivers Especially when there exist compatible device drivers the development would become quite laborsaving It becomes
19. led ttySO at MMIO 0x0 irq 6 is a 16550A ttyS1 at MMIO 0x0 irq 7 is a 16550A RAMDISK driver initialized 16 RAM disks of 4096K size 1024 blocksize loop loaded max 8 devices RAMDISK romfs filesystem found at block 0 RAMDISK Loading 948 blocks 1 disk into ram disk done VFS Mounted root romfs filesystem readonly Freeing init memory 48K Shell invoked to run file etc rc Command hostname Philips LPC2294 Command bin expand etc ramfs img dev raml Command mount t proc proc proc Command mount t ext2 dev raml var Command mkdir var tmp Command mkdir var log Command mkdir var run Command mkdir var lock Command mkdir var empty Command cat etc motd Welcome to Plo ooON EIN Z 7 Plot tt tet t4 Ill LEN _ _ For further information check http www nxp com external uclinux Command ifconfig lo 127 0 0 1 Command route add net 127 0 0 0 netmask 255 255 255 0 lo Command dhcpcd amp 13 Command sh Sash command shell version 1 1 1 gt Reading command line Bad file descriptor pid 14 failed 256 Execution Finished Exiting AN10389_1 NXP B V 2007 All rights reserved Application note Rev 01 15 February 2007 18 of 23 NXP Semiconductors AN10389 AN10389_1 init Sash command shell gt ls la drwxr xr x 0 0 drwxr xr x 0 0 drwxr xr x 0 0 drwxr xr x 0 0 drwxr xr x 0 0 drwxr xr x 0 0 drwxr xr x 0 0 drwxr xr x 0 0 dr xr x
20. menu Too pN oi Default Big Endian node 5 lt Select gt Fig 8 LPC22xx options menu AN10389_1 NXP B V 2007 All rights reserved Application note Rev 01 15 February 2007 11 of 23 NXP Semiconductors AN1 0389 Getting started uClinux with LPC22xx In the following General Setup option please note the kernel command string Fig 9 The initial ramdisk base address and size can be changed according to your romfs img size root dev ram0 initrd 0x81200000 1000K console ttyS0 Default kernel Fig 9 General setup menu For the serial and console support please enter into the option Character device gt Serial drivers see Fig 10 The UART of NXP LPC22xx is 16c550 compatible so toggle two following items for serial and console input output AN10389_1 NXP B V 2007 All rights reserved Application note Rev 01 15 February 2007 12 of 23 AN10389 Getting started uClinux with LPC22xx NXP Semiconductors 8250 16550 and compatible serial support Fig 10 Serial drivers menu For file systems options the romfs read only acts as the root file system which is necessary see Fig 11 whereas the ext2 is read writable but it consumes significant memory space You can determine to select ext2 or not or even other file systems according to your memory size and your application NXP B V 2007 All rights reserved AN10389
21. nment arm elf insight is the GUI version of arm elf gdb MultilCE gdb server a server for ADS tools to debug GNU program free provided by ARM company and running under Windows environment MultilCE same as above MultilCE Server same as above But until now it seems there is no perfect method for source code awareness Usually it should be assisted by printk the original debugging method for Linux kernel debugging For using printk the serial UART interface should be initialized in the bootloader previously 7 3 2 Debug application program Debugging uClinux application program is relatively easier than kernel debugging By using arm elf gdb and arm elf gdb server as a stuck on the user board the user program can be debugged under PC Linux environment Actually user can debug application program under PC Linux environment first and then download to the board for further verification AN10389_1 NXP B V 2007 All rights reserved Application note Rev 01 15 February 2007 21 of 23 NXP Semiconductors AN10389 8 Legal information Getting started uClinux with LPC22xx 8 1 Definitions Draft The document is a draft version only The content is still under internal review and subject to formal approval which may result in modifications or additions NXP Semiconductors does not give any representations or warranties as to the accuracy or completeness of information included herein and shall
22. om the scratch The kernel version of linux 2 6 x directory in the 20040408 distribution is linux 2 6 2 uc0 We need another kernel with newer kernel version for uClinux ARM 2 6 here root mylinux uClinux dist tar jxvf incoming linux 2 6 11 8 tar bz2 Now we have got the whole linux 2 6 11 8 codes and need to patch the kernel with the Samsung patch root mylinux uClinux dist gzip dc incoming linux 2 6 11 8 hsc0 patch gz patch p0 3 Add NXP LPC22xx patch You should have had two compressed files for LPC22xx 3 1 LPC22xx patch against Linux kernel The patch is against linux 2 6 11 8 kernel plus the Samsung patch 1 root mylinux uClinux dist gzip dc incoming linux 2 6 11 8 lpc22xx patch gz patch p0 You should see the codes that are patched in some directories that contains lpc22xx string You can use the directory name linux 2 6 11 8 for your uClinux 2 6 kernel directory without further operation However recommend to use the kernel directory name to linux 2 6 x because it is more convenient So you don t need the linux 2 6 x directory which is included in the uClinux dist 2 root mylinux uClinux dist rm rf linux 2 6 x And we rename the newer patched kernel directory to linux 2 6 x 3 root mylinux uClinux dist mv linux 2 6 11 8 linux 2 6 x 3 2 LPC22xx patch against uClinux distribution Patch the file uClinux dist lpc22xx patch gz root mylinux uClinux dist cd
23. r x 18 0 0 lrwxrwxrwx 0 0 lrwxrwxrwx 0 0 drwxr xr x 0 0 drwxr xr x 7 0 0 gt ps PID PORT STAT SIZE SHARED CPU a S 163K OK 7 3 2 S OK OK 0 0 3 S OK OK 0 0 4 S OK OK 0 0 5 S OK OK 0 0 6 S OK OK 0 0 8 5 OK OK 0 0 7 S OK OK 0 0 15 R 102K OK 11 8 gt cat proc meminfo MemTotal 6968 MemF ree 4648 Buffers 1076 Cached 400 SwapCached 0 Active 1160 Inactive 300 HighTotal 0 HighFree 0 LowTotal 6968 LowFree 4648 SwapTotal 0 SwapFree 0 Dirty 0 Writeback 0 Mapped 0 Slab 700 Committed_AS 0 PageTables 0 VmallocTotal 4194303 VmallocUsed 0 VmallocChunk 4194303 gt cd var var gt cd lucy var lucy gt hello kB kB kB kB kB kB kB kB kB kB kB kB kB kB kB kB kB kB kB kB kB kB ke Hello Philips kKkKKK Hello LPC22xx Welcome using uClinux for Philips LPC22xx Booting to single user mode version 1 1 1 OK Ke RK KR Ke 32 Jan 32 Jan 32 Jan 32 Jan 32 Jan 32 Jan 32 Jan 32 Jan 0 Jan 4 Jan 8 Jan 32 Jan 1024 Jan COMMAND sbin init ksoftirqd 0 events 0 kblockd 0 pdflush pdflush aio 0 kswapd0 bin sh Getting started uClinux with LPC22xx KKK bin dev etc home lib mnt proc sbin gt bin tmp gt var tmp usr var Under the uClinux shell you can type some Linux command to check the effect E g Is ps cat cd etc And you can run your first Hello the World program in the shell too Appl
24. rd e Connect the board UARTO with PC COM port by serial cable e Open a serial terminal on the PC and set its parameters as 9600 8n1n e Power on the board NXP B V 2007 All rights reserved Application note Rev 01 15 February 2007 17 of 23 NXP Semiconductors AN1 0389 Getting started uClinux with LPC22xx Below is the example running process It may be a little different according to your system Linux version 2 6 11 8 ucLPC root localhost localdomain gcc version 2 95 3 2 0010315 release Tue Nov 16 09 19 46 CST 2004 CPU Philips LPC22xx 22000000 revision 0 ARMvundefined unknown Machine LPC2294 PHILIPS ELECTRONICS Co Ltd On node 0 totalpages 2048 DMA zone 0 pages LIFO batch 1 Normal zone 2048 pages LIFO batch 1 HighMem zone 0 pages LIFO batch 1 Built 1 zonelists Kernel command line root dev ram0 initrd 0x81200000 1000K console ttyS0 PID hash table entries 64 order 6 512 bytes Memory 8MB 8MB total Memory 5896 KB available 994K code 133K data 48K init Calibrating delay loop 3 57 BogoMIPS Dentry cache hash table entries 1024 order 0 4096 bytes Inode cache hash table entries 1024 order 0 4096 bytes Mount cache hash table entries 512 order 0 4096 bytes checking if image is initramfs it isn t ungzip failed looks like an ini trd Freeing initrd memory 1000K POSIX conformance testing by UNIFIX Serial 8250 16550 driver Revision 1 90 2 ports IRQ sharing disab
25. te via http www nxp com external uclinuxdist 2 uClinux 2 6 Kernel You could find the latest uClinux ARM kernel patch at http www nxp com external opensrcsamsung At the download section you ll find the link of the original kernel package and the latest linux 2 6 x patch under the kernel directory of the Public Linux Archive http www nxp com external kernel pub 3 NXP LPC22xx patch From NXP s support engineers or download from maillist of http www nxp com external uclinux you could get the uClinux patch and kernel patch against linux 2 6 x plus the above patch for LPC22xx http www nxp com external mailman 2005 June Name uClinux Philips LPC22xx tar gz For updating info please pay attention to the maillist of uClinux official website Make source code tree After gathering all files for first compilation on this guide the downloaded files are gathered on incoming we should make up them together 1 Untar the uClinux distribution On a directory which has enough free available space gt 2 GB untar the uClinux distribution root mylinux tar zxvf incoming uClinux dist 20040408 tar gz Let s look around what we have on the uClinux dist directory root mylinux cd uClinux dist root mylinux uClinux dist ls al total 104 drwxr xr x 15 1000 users 4096 Apr 8 09 27 NXP B V 2007 All rights reserved Application note Rev 01 15 February 2007 4 of 23 NXP Semiconductors
26. xternal uclinux website You could find the latest toolchain at the same place as the kernel and patch download section above under the Toolchains section http www nxp com external opensrcsamsung download 2 Install the toolchain At the root directory execute the arm elf tools 20040427 sh like 10 root mylinux bin sh incoming arm elf tools 20040427 sh Hardware platform The hardware tools needed NXP B V 2007 All rights reserved Application note Rev 01 15 February 2007 6 of 23 NXP Semiconductors AN1 0389 Getting started uClinux with LPC22xx e LPC22xx development board and power supply for the board e n Circuit emulator e g Multi ICE by ARM company e A PC with serial port and parallel or USB port for Emulator e A serial cable Besides the above necessary equipment network cable and or USB cable and others may be needed according to system requirement A uClinux development system is shown in Fig 2 Ba interface In Circuit Emulator g LPC22xx board GNU tools Linux and ADS WinXP Power Supply G t Serial Connection Fig 2 Hardware platform for uClinux development 3 System configuration 3 1 AN10389_1 System configuration is to configurate the uClinux system options customize functionality and make the image file size variable meanwhile We need setup the configuration for kernel file systems and user appli
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