Linux-FBK 750-860 Tips

Data sheet 750-860 – data sheet 750-863

Done on Slackware 12.2. Information Source: Manual. The iso image is available at the Embedded-Linux page of the wago website (registration necessary).

su -
mount -o loop Linux_V3_20070403.iso /mnt/tmp #mount the BSP Cdrom Iso Image
cd /mnt/tmp/linux/toolchain
./install.sh
exit

This installs the following files and dirs (subdirs not listed; tested with find -mmin / -cmin):

/usr/bin/mkimage (via mkimage-0.3.0-1.i386.rpm)
/usr/local/bin/arm-uclinux-elf-*
/usr/local/arm-uclinux-tools
/tftpboot
/tagetfs

Additionally the following line is appended to /etc/sudoers

%users ALL = NOPASSWD: /bin/mknod

Installation as normal user!

cd /mnt/tmp/linux/sources
./install.sh

This installs the following files and dirs (subdirs not listed; tested with find -mmin / -cmin):

/$HOME/uclinux-dist (1.3 GB)
/tftpboot/jffs2.img
/tftpboot/linux.flashme

cd $HOME/uclinux-dist
make menuconfig # and exit without save!
make

This also creates new jffs2.img and linux.flashme files in /tftpboot

Note that the manual states to call make menuconfig. But in my case it changed noting in uclinux-dist, so i think it is unnecessary.

1. Set the date/time in UTC with date MMDDhhmm[[CC]YY].
   (According to the manual 4.3.2 date sets the realtimeclock, but this is not true.)
2. Save the system time to the hardware clock: hwclock –systohc
3. Afer a reboot a call to date should print the correct local time.

Sources:

1. Manual
2. DENX U-Boot and Linux Guide (DULG) → 5.9. U-Boot Command Line Interface

This guide is based on the manual → 5.10 File System and Linux Kernel Update

1. Boot, log in as root and set the date/time (see above)
2. Reboot and enter uboot ¹⁾; LFBK # appears
3. Type printenv to check the environment variables and correct the ipaddresses of the FBK and the server if required:

   setenv ipaddr 192.168.xxx.yyy
   setenv serverip 192.168.xxx.zzz

4. Compare all other variables with the actual manual and correct them if required. Especially check update-rootfs, update-kernel & update-ub. (E.g. printenv update-kernel)
5. Type saveenv to save the modifications into the flash.
6. Start TFTP on your development machine with /tftpboot as TFTP source directory (uncomment and modify the line in /etc/inetd.conf accordingly; make /etc/rc.d/rc.inetd runnable and start it with /etc/rc.d/rc.inetd restart)
7. Only necessary if „Compile all“ (see above) hasn't been done: Mount the toolchain.iso and copy linux.flashme and jffs2.img to /tftpboot
8. Update:

   run update-kernel
   run update-rootfs

   Dont use a managed Hub; if you encounter problems with your hub or switch, use a crosslink cable!

9. To see the boot messages and to get a login shell on the serial connection after the update to kernel 2.6 the little switch on the right side of the serial connector has to be set to the upper position!

The FBK freezes with this message: BUG: soft lockup detected on CPU#0!

Download the patch from the Wago service and apply the patch according to the help file. Afterwards you again have to compile all, update the target system and configure the webserver.

May affect Unix domain sockets!

Example App: „sbtimer“

• mkdir ~/uclinux-dist/user/sbtimer
• touch ~/uclinux-dist/user/sbtimer/sbtimer.c
• write a main() in sbtimer.c
• Add sbtimer to the dir_y variable in ~/uclinux-dist/user/Makefile
• Create ~/uclinux-dist/user/sbtimer/Makefile.
• Cd to ~/uclinux-dist and call make user.
• Upload sbtimer with FTP to the target

EXEC = sbtimer
 
all: install
 
# This adds an implicit rule for generating $(EXEC).o from $(EXEC).c:
$(EXEC): $(EXEC).o
	$(CC) $(LDFLAGS) -o $@ $(EXEC).o $(LDLIBS)
	cp $(EXEC) /targetfs/
 
romfs:
	$(ROMFSINST) /bin/$(EXEC)
 
clean:
	-rm -f $(EXEC) *.elf *.gdb *.o
 
install: $(EXEC)
	lftp -c "open root:wago@wago; cd bin; put $(EXEC); chmod a+x $(EXEC)"

$(CFLAGS) ²⁾ contains as the first -I-switch the path $HOME/uClinux/lib/uClibc/include, which points to $HOME/uClinux/uClibc/include. Here are all common header files.

Auch asm/types.h wird hier gefunden, jedoch löst das der asm-Symlink tatsächlich nach ~/uClinux/linux-2.4.x/include/asm/types.h auf.

The default Boa installation on the 750-860 serves CSS files with the mime type text/html instead of text/css. This my lead to problems especially when HTML document type „strict“ is used. Go around this by adding the line

AddType text/css css

to /etc/boa/boa.conf

Note: The path to the mime.types file in boa.conf is wrong: /etc/mime.types instead of /etc/boa/mime.types. But even wiht the correct path, the mime.types file seems to be ignored.

Error- and access logging does not work. If the according directive in boa.conf ist activated, eg ErrorLog, the server refuses to start.

Two cron apps are coming with wago uclinux-dist: cron and vixie-cron. cron ist smaller so I use this one.

Add cron to the dir_y variable in ~/uclinux-dist/user/Makfile, compile and install it on the target.

Example: The following 2 files are necessary to make the digital output 4.0 change its state every minute:

cat /etc/config/crontab
#
*  *  *  *  *  root  /bin/beckis

cat /bin/beckis
#!/bin/msh
kbusdemo -n 4.0
sleep 2
kbusdemo -o 4.0

Start cron at PO. Where to add the cron start command? In /etc/startwago? Lock at Manual!

• /proc/driver/kbus/pab gibt Auskunft über die gesteckten IO-Module und deren Byte-Adressen
• kbusdemo liegt in entgegen dem Manual in user/wagokbusdemo

• Allgemeine Wago-Produkte-Doku / Links to Data Sheet & Manual
• Wago stellt eine Support-Cd, diese wird im Folgendem CD_Linux_Controller genannt
• Telnet und Ftp-Zugang mit root/wago
• Ip-Adresse ändern mit wagoset
• Bootstrap: /etc/inittab startet ua. /etc/startwago startet ua. /bin/mb_tcp (modbus)

• NFS benutzen

• Ist eine Austauschplattform (Wiki, Forum, FAQ's) zum 750-860 im Internet vorhanden?
• Compiler: Woher kommen die Datentypen __u16, __u8, ...
• c++-code mit /usr/local/bin/arm-elf-g++ verwendbar? Mit welchen Paramtern aufzurufen?