At present, embedded processors based on ARM cores in embedded systems have become the mainstream in the market. With the wide application of ARM technology, the establishment of embedded operating system for ARM architecture has become a hot topic of current research. S3C2410 is a 16/32-bit embedded processor developed by SAMSUNG based on ARM920T processor core. It runs at more than 200 M. It has rich on-chip resources such as MMU and cache. It is the largest shipment based on ARM920T core. A chip. At present, there are many embedded operating systems, such as Tor2nado's VxWork, Microsoft's Windows CE and so on. A large number of developers choose Linux, because its source code is open and can be easily modified to be ported to its own target platform system. And it turns out that the effect is satisfactory. The combination of the two will surely create a world in the world of embedded systems.
Migration of Linux operating system2.1 The meaning of transplantation
In order for standard Linux to work on ARM embedded processors, it is necessary to go through the process of porting (porTIng). The so-called porting is to allow a set of software to function properly on a selected set of hardware platforms, that is, to make appropriate modifications to the platform dependent parts. The kernel source arch subdirectory contains all the core code associated with the platform architecture. Each of its subdirectories represents one of the supported architectures, and arm is a subdirectory of our chosen processor architecture. Our transplant work is mainly concentrated in this directory.
2.2 specific implementation of transplantation
If we have built a complete cross-compilation platform, the migration can begin (using the most widely used linux-2.4 as an example, under /usr/SRC/linux-2.4.18).
/ Makefile
A project often contains a lot of files and is placed in multiple directories according to certain rules. The Makefile is used to specify compilation rules, such as which ones need to be compiled and which ones to compile first. What I have to do here is:
Specify the target platform ARCH := $(shell uname -m | sed -es/i.86/i386/ -es/sun4u/sparc64/ -es/arm.*/arm/ -es/sa110/arm/)
Set to ARCH :=arm
Specify cross compiler CROSS_COMPILE =
Set to CROSS_COMPILE =arm-linux-
/arch/arm/Makefile
The startup code is generated through this file. Since the 2.4 kernel does not have support for the S3C2410, add the following code yourself.
Ifeq ((CONFIG_ARCH_ S3C2410), y)
TEXTADDR = xxx
MACHINE = s3c2410
Endif
TEXTADDR is the virtual start address of the kernel [6], and is also the final running address of the kernel, usually set to PAGE_OFFSET +0x8000, combined according to the actual situation [2].
/arch/arm/config.in
Config.in is the configuration file that determines what we see in the configuration menu. Add the $CONFIG_ARCH_S3C2410 suboption [5] yourself.
If ["$CONFIG_ARCH_S3C2410" = "y" ]; then
Comment'Archimedes/A5000 ImplementaTIons'
Dep_bool 'SMDK (MERI TECH BOARD) '
CONFIG _S3C2410_SMDK//
$CONFIG_ARCH_S3C2410
//other
Fi
In if [ "$CONFIG_FOOTBRIDGE_HOST" = "y" -o
......
"$CONFIG_ARCH_SA1100" = "y" ]; then
Define_bool CONFIG_ISA y
Else
Define_bool CONFIG_ISA n
Fi
Add "$CONFIG_ARCH_s3c2410" = "y"-o as appropriate.
/arch/arm/boot/Makefile
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