구차니의 잡동사니 모음

FreeRTOS+TCP

FreeRTOS+FAT

[링크 : http://www.freertos.org/FreeRTOS-Labs/index.shtml]

    [링크 : http://www.freertos.org/FreeRTOS-Labs/RTOS_labs_download.html?0]

FreeRTOS+Nabto

FreeRTOS+FAT SL

FreeRTOS+UDP

FreeRTOS+CLI

FreeRTOS+Trace

FreeRTOS+IO

[링크 : http://www.freertos.org/FreeRTOS-Plus/]

freeRTOS를 써볼일이 생길것 같아서 조사중..

[링크 : http://webnautes.tistory.com/595]

[링크 : http://webnautes.tistory.com/category/임베디드/freeRTOS%28arduino%29]

rt linux ?

[링크 : http://www.pebblebay.com/raspberry-pi-embedded]

[링크 : http://docs.emlid.com/Downloads/Real-time-Linux-RPi2/]

    [링크 : http://embedded-computing.com/articles/getting-raspberry-rtos-ready-embedded-systems/]

FreeRTOS Ported to Raspberry Pi

[링크 : https://github.com/jameswalmsley/RaspberryPi-FreeRTOS]

    [링크 : http://www.osrtos.com/rtos/freertos]

ChibiOS/RT

[링크 : http://www.chibios.org/]

[링크 : http://sourceforge.net/projects/chibios/files/] GPL version

    [링크 : http://www.stevebate.net/chibios-rpi/GettingStarted.html]

ARM9 시리즈 이지만.. FP 연산이 불가능한 녀석이 바로 Xscale

그래서 꽤나 더 느리게 느껴진거였나..

아무튼 XScale에서는 eCos에서 사용하는 부트로더인 redboot를 기본으로 채택하고 있어서

redboot + linux 조합이었던 것.

eCos는 RTOS

PXA255에는 CF와 USB Client가 내장

The XScale architecture is based on the ARMv5TE ISA without the floating point instructions.

RedBoot — open-source bootloader, the standard boot firmware shipped with XScale boards

[링크 : https://en.wikipedia.org/wiki/XScale]

RedBoot (an acronym for Red Hat Embedded Debug and Bootstrap firmware) is an open source application that uses the eCos real-time operating system Hardware Abstraction Layer to provide bootstrap firmware for embedded systems. 

[링크 : https://en.wikipedia.org/wiki/RedBoot]

The Embedded Configurable Operating System (eCos) is a free and open source real-time operating system intended for embedded systems and applications which need only one process with multiple threads.

[링크 : https://en.wikipedia.org/wiki/ECos]

ppt 에 추가된 내용으로

부팅 시간이

linux 2.6.7 - 437.11

uclinux 2.6.7 - 415.16

으로 22초 정도 단축된다.

context switching 에 소요되는 시간인

linux - avg 110us

uclinux - avg 20us

에 비하면... 의외로 미미한 수준?

MMU 지원을 받지 못해 소스를 수정해야 하는 오버헤드를 생각하면

그리 큰 성능향상이라고 하긴 그럴 듯..

[링크 : http://bit.sparcs.org/~gangster/publication/uc_linux_fall.ppt]

[링크 : http://opensrc.sec.samsung.com/document/uc-linux-04_sait.pdf]

BIN30과 obj/sample.*은

버전과 프로젝트에 맞춰 넣어주어야 한다.

C:/Keil/ARM/BIN30/fromelf.exe --output obj/sample.bin --bin obj/sample.axf

[링크 : https://e2e.ti.com/support/microcontrollers/stellaris_arm/f/471/t/45884]

[링크 : http://micrium.com/rtos/ucosii/overview/]

[링크 : https://www.csie.ntu.edu.tw/~d6526009/ucOS2/Chapter-1.pdf]

+

[링크 : http://repilria.tistory.com/382]

[링크 : http://stackoverflow.com/questions/2396430/how-to-use-lock-in-openmp]

[링크 : https://computing.llnl.gov/tutorials/openMP/#OMP_SET_LOCK]

[링크 : http://www.mathcs.emory.edu/~cheung/Courses/355/Syllabus/91-pthreads/openMP.html]

What is uClinux?

The original uClinux was a derivative of Linux 2.0 kernel intended for microcontrollers without Memory Management Units (MMUs). However, the Linux/Microcontroller Project has grown both in brand recognition and coverage of processor architectures. Today's uClinux as an operating system includes Linux kernel releases for 2.0 2.4 and 2.6 as well as a collection of user applications, libraries and tool chains.

[링크 : http://www.uclinux.org/description/]

[링크 : http://www.uclinux.org/]

[링크 : http://www.uclinux.org/pub/uClinux/]

[링크 : http://sourceforge.net/projects/uclinux/]

[링크 : https://wiki.kldp.org/wiki.php/WhyIsMallocDifferentUnderUclinux]

[링크 : http://goo.gl/pzUmg] atmega1284p uclinux

+

[링크 : https://wiki.kldp.org/wiki.php/%B8%AE%B4%AA%BD%BA%C4%BF%B3%CE#s-5]

FreeRTOS is designed to be small and simple. The kernel itself consists of only three or four C files. To make the code readable, easy to port, and maintainable, it is written mostly in C, but there are a few assembly functions included where needed (mostly in architecture-specific scheduler routines).

Supported architectures

ARM architecture

 ARM7

 ARM9

 ARM Cortex-M0

 ARM Cortex-M0+

 ARM Cortex-M3

 ARM Cortex-M4

 ARM Cortex-A

Atmel

 Atmel AVR

 AVR32

 SAM3

 SAM4

 SAM7

 SAM9

 SAM D20

 SAM L21

Intel

 x86

 8052

[링크 : https://en.wikipedia.org/wiki/FreeRTOS]

[링크 : http://www.freertos.org/]

[링크 : http://sourceforge.net/projects/freertos/]

Linux support

The mainline Linux kernel gained support for OpenRISC in version 3.1.[17] The implementation merged in this release is the 32-bit OpenRISC 1000 family (or1k).[18] Previously OpenRISC 1000 architecture, but this has now been superseded by the mainline port.

RTOS support

A number of real-time operating systems have been ported to OpenRISC, including RTEMS, FreeRTOS and eCos.

QEMU support

Since version 1.2 [19] QEMU supports emulating OpenRISC platforms.

[링크 : https://en.wikipedia.org/wiki/OpenRISC]

[링크 : http://openrisc.io/]