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EM-1240-LX User’s Manual Software Package
3-2
EM-1240-LX Software Architecture
The pre-installed µClinux Operating System used by the EM-1240-LX follows the standard
µClinux architecture, making programs that follow the POSIX standard easily ported to the
EM-1240-LX by using the GNU Tool Chain provided by
www.uClinux.org. In addition to the
Standard POSIX API, device drivers for the buzzer, and UART for the serial ports are also
included.
The EM-1240-LX’s Flash ROM has more than one smaller partition, which contain the Boot
Loader, Linux Kernel & Root (/) File System Image, and User Directory partitions.
For most applications, users often spend a lot time maintaining the operating system and
modifying the system configuration. In order to save on the total cost of development and
maintenance, the EM-1240-LX is specially design to partition a “User Directory” for storing the
user’s system configuration parameters.
The EM-1240-LX has a built-in
mechanism that prevents system crashes,
helping preserve system reliability. The
procedure is as follows.
When the Linux kernel boots up, the
kernel mounts the root file system and
then enables services and daemons. The
kernel also looks for the system
configuration parameters via rc or inittab.
Normally, the kernel uses the User
Directory to boot up the system. The
kernel will only use the default
configuration _etc & _home when the
User Directory crashes.
The EM-1240-LX uses ROMFS for the Linux kernel image, Root File System, and Protected
configuration, and uses JFFS2 for the User Directory.