Embedded Linux S3C2440 – USB Gadget Drivers

Summary Tested on Embedded Linux S3C2440 target board to be configured as USB device, like USB mass storage and serial cable, the test result was successful. And tried to test S3C2440 board as USB Host, I didn’t get successful result. Basics S3C2440 supports 2-port USB host interface as follows, – OHCI Rev 1.0 compatible. – […]

Embedded Linux S3C2440 – Partitions an FileSytem (YAFFS2)

Summary Tested embedded Linux S3C2440 for partitions and YAFFS2 FileSystem with successful result. Embedded Linux S3C2440 booted up on Linux kernel with YAFFS2 FileSystem support and root_yaffs root file image downloaded to a partition of NAND flash. S3C2440 NAND flash 4 partition The NAND flash of S3C2440 board has been divided into 4 partitions. The […]

Embedded Linux S3C2440 – QEMU and Graphic

Summary Tested QEMU and Graphic application on Embedded Linux S3C2440. QEMU is open-source software, can be run on Windows and Linux host, it is software based emulator and instruction set simulator to be used to simulate the embedded processors. QEMU supports the emulation of several target architectures like ARM, PowerPC, x86. QT for embedded linux […]

Embedded Linux S3C2440 Profiling

Summary OProfile is a profiling system can do profiling on all parts of a running system from the kernel to shared libraries and to binaries. It can work in the background, collecting information at a low overhead, it is ideal for profiling the entire system to determine the bottle necks in a real running system. […]

Embedded Linux S3C2440 – Multi-thread Scheduling

Summary Test the debugging of the Multi-thread Scheduling on embedded Linux S3C2440, both in All-stop mode and Non-stop mode. GDB supports multi-thread application debugging, and there are two modes of controlling the execution of the program with GDB dubugger. All-stop mode is the default mode, when the thread of the program stops (at a break […]

Embedded Linux S3C2440 – Kernel Debugging

Summary Conduct Kernel debugging test on Embedded Linux S3C2440 by using KGDB. KGDB has been integrated into Linux kernel from version 2.6.15, it requires a serial connection to the development host. It is a cross GDB running on the development host workstation. Refer to earlier blog entry Embedded Linux S3C2440 – Kernel Module, all the […]

Embedded Linux S3C2440 – Kernel Module

Summary Embedded Linux device driver is part of Linux kernel, application will use Linux device driver to interact with Linux Kernel. You can compile the driver into the kernel or you can compile the driver into module, load and use the module. Application programs have a main() function, where Linux drivers have macro module_init to […]

Embedded Linux S3C2440 Networking

Summary Embedded S3C2440 Mini2440 system has limited amount of storage available on the board for the application code. We can use the network interface to provide and expansion to the file system by mounting a network file system to the board. And we con use telnet network interface to login into embedded S3C2440 Mini2440 board. […]

Embedded Linux S3C2440 Application Development and Debugging

Summary Write your own application and include the application into the final image to be downloaded into the S3C2440 board, and you can debug the application by using GDB. User Application Below is the simple user application, print a string, and reverse the string and print again. #include <stdio.h> #include <string.h> #include <stdlib.h> void my_print(char […]

Embedded Linux S3C2440 Build and Boot an Image

Summary Tried to build and boot zImage on Embedded Linux S3C2440. Install Buildroot I tried to compile and install the latest Buildroot by downloading at https://buildroot.org/ , ‘buildroot-2018.02.9.tar.bz2’, the compiling and installation was successful, and change the /etc/profile to below, PATH=$PATH:/home/iot/buildroot-2018.02.9/output/host/usr/bin TARGET_DIR=/home/iot/buildroot-2018.02.9/output/target Note: you cannot use root to compile Buildroot. But the compiling for busybox […]

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