1. Web UI & System Configuration Design
RDC R321x/R323x
Web UI & System Configuration Design
March. 23, draft version 0.99
RDC Semiconductor Co., Ltd. All Rights Reserved.

2. Architecture – Linux Boot Up
Linux Kernel Boot Up & Initialization
Configuration data stored
in the Flash
Get & Check configuration in Flash
Yes, Found
No, not found
Get default configuration in Filesystem
Default configuration data
stored in the RAMDisk
Read configuration data, then initial & enable application

3. System Configuration & Flash Format
0x000000
Linux Kernel
0x1F0000
Configuration Database
0x200000
Ram Disk
(File System)
0x3E0000
Redboot
0x3FFFFF
Address define in the //linux2425/drivers/mtd/maps/physmap.c

4. Get/Store Configuration in the Flash
Get the configuration
Read data from the flash (MTD block 2)
cat /dev/mtdblock/2 > /tmp/config.tar.gz
Decompress the data & check the format
tar -zxvf /tmp/config.tar.gz
if [ -r /tmp/configuration/sysinfo.conf] ….
Store the configuration
Compress the configuration data into a file
tar -cvzf /tmp/config.tar.gz /tmp/configuration
Store the file to the flash (MTD block 2)
cat /tmp/config.tar.gz > /dev/mtdblock/2

5. System Configuration - File Lists
sysinfo.conf
lan.conf
wan.conf
wireless.conf
manage.conf
Put in the /tmp/configuration directory
Demo & show configuration file
. /tmp/configuration : run time configuration data base
. /http/config.tar.gz : default configuration file

6. System Configuration - Data Structure
Example : lan.conf
# start eth1 Tag to define start
DHCP_SERVER=ON  Variable, Value
IPADDR=
SUBNETMASK=
# end eth1 Tag to define end

7. Linux Boot Up – Start Service
inittab (/etc)
rcS (/etc/init.d)
RDC’s application entry point
Get & check configuration file
Invoke individual process
S50StartService (/etc/init.d)
getmac.sh (/etc/app)
getlan.sh …
nat.sh …
Process Functions
Read the variable, value pair
Apply and enable the configuration
( Demo and explain the program: S50StartService & getmac.sh )

8. Web UI – Http daemon start up
Linux boot up initialization
Startup http daemon
S50StartService(/etc/init.d) will start up the thttp daemon (/http)
### Start Http Daemon ####
chmod 755 /http/webroot  r+x attribute
chmod 644 /http/webroot/*.htm  r attribute, no x
chmod 755 /http/webroot/*.cgi  r+x attribute
/http/thttpd -C /http/thttpd.conf

9. Web UI – thttp.conf logfile=/tmp/thttpd.log  Must be assigned
Put in the /http directory
user=root
cgipat=**.cgi
logfile=/tmp/thttpd.log  Must be assigned
pidfile=/tmp/thttpd.pid
port=80
Globalpasswd
dir=/http/webroot  Html path
nochroot

10. Web UI – Show html Http daemon receive html request Run time
Configuration Database
(/tmp/configuration)
RDC’s CGI function
Get the run time
configuration data
Patch & output
( Demo lan_eth1.cgi & lan_eth1.htm )

11. Web UI – Post and Save configuration
Http Daemon receive POST request
Run time
Configuration Database
(/tmp/configuration)
RDC’s CGI function
Call proccgi - Get the value to
enviroment parameter
Get the value and save to
run time configuration space
( Demo lan_eth1.cgi & lan_eth1.htm )

12. Files List - Review
S50StartService (/etc/init.d/)  RDC main entry point in Linux system boot up
/etc/app  Get & apply configuration function directory
/etc/http
config.tar.gz  Default configuration file
thttpd, thttpd.conf  Http daemon
/etc/http/configuration  Original default configuration file lists
(No compressed, no used in the run time code ,can be removed to save memory)
/etc/http/webroot HTML & CGI root files
/tmp
thttpd.log, thttpd.pid  Http daemon log files
config.tar.gz  From the flash or default configuration file
/tmp/configuration  Run time configuration data base
brctl,iptables,iwpriv  Put in the /etc/app directory
proccgi  Put in the /sbin directory

13. Web Firmware Upgrade
A tar-ball file include upgrade.lst and all image file( bzImage, redboot.bin, root_fs_i386.ext2.gz).
upgrade.lst control what image will be upgrade
upgrade.lst contents
# start upgrade_files
KERNEL_IMAGE=bzImage
ROOT_IMAGE=root_fs_i386.ext2.gz
REDBOOT_IMAGE=redboot.bin
# end upgrade_files

14. Next version Improvement
Support Javascript on html, let user configure it more friendly
Add on functions
DHCP Client in the Wan site
DHCP Server in the Lan site
Wireless WEP security support
FTP/Samba IDE/USB storage access

15. Q & A

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