User manual

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3 Linux Operating System
The SBC8140 has a complete Linux system (with 4.3” LCD support)
preinstalled in its on-board NAND Flash. This chapter contains several
sections to introduce the Linux system of the SBC8140 in detail, including
the structure of the embedded Linux system, software features, system
development process, driver introduction and development, and system
updating.
Note:
 Some instructions have been proceeded by an icon “” to prevent confusion
caused by the long instructions that occupy more than one line.
 Ubuntu Linux is used in this document. If you do not have a Linux system on
your PC, please refer to Installing an Ubuntu Linux.
3.1 Structure of the Embedded Linux System
The following figure shows the structure of the embedded Linux system:
Figure 12: Embedded Linux System
 x-loader: First-level booting program; after the kit is powered on,
the program is copied from the ROM in CPU to RAM and executed so
as to initialize the CPU and copy u-boot to RAM, and then u-boot
takes control over the system,