ARM, Benchmark, File system, FIO, GSoC, RTEMS, Software

Benchmarking RTEMS Filesystems using FIO

Hi, In this post we will explore FIO’s RTEMS port and how it can be used to benchmark RTEMS filesystems and drivers. First, let’s have a quick look at all the RTEMS filesystems: RTEMS FILESYSTEMS RTEMS supports mainly two types of filesystems : Network and Physical fs. Benchmarking support for networking filesystems isn’t yet available. However, nearly every other physical filesystem can be benchmarked and contrasted. Heap based file systems are those which uses malloc() for file…

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ARM, CAM, FreeBSD, mmccam, SDIO, Software

Building FreeBSD’s SDIO driver for BeagleBone Black

Hi all, This post mainly concern with building FreeBSD’s SDIO driver for BeagleBone Black by cross compiling it on AMD platform. I had few unresolved issues with the master branch of current FreeBSD tree. So, for this i used another unofficial branch: https://github.com/kibab/freebsd/tree/mmcam-new . It does have the required KERNCONF file with stable SDIO driver. A lot of steps below are similar to the one given on: https://forums.freebsd.org/threads/cross-compiling-beaglebone-on-amd64.64718/#post-384835  with slight but inevitable changes. Procedure:  Before proceeding you…

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ARM, Software

DECODING ARM

This introductory post aims at discussing a bit about business model of ARM ltd.(that’s right the company behind ARM architectures!!), different ARM architectures for different utilities and most importantly a brief about ARM cortex M , ARM cortex R and ARM cortex A. So, here’s the content: Business model of ARM ltd. ARM Terminology Different ARM Architectures and Families Third party ARM variants ARM cortex M ARM cortex R ARM cortex A ARM Ltd. ARM ltd. was…

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ARM, Software

ARM Instruction Set(Part 2): Types,Operands and Addressing Modes

Types,Operands and  Addressing Modes After a brief introduction of ISA, here in this part of the series we’ll look at: Content:   Types of Operands  Instruction set design Types of Instructions Types of Addressing modes Types of Operands: Operands basically refer to the type of parameter which is passed on to, along with an instruction. It might be a : Register/Memory address Constant/Immediate Consider the following examples: ADD r1,r2,r3;      will add r2 and r3 and store…

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ARM, Software

DIY: Generating Ramp/Sawtooth from PWM

DIY: Generating Ramp/Sawtooth from a PWM signal Lack of any good tutorial to produce a ramp/sawtooth wave from a PWM signal, urged me to make one! This post was in fact a part of one of my recent ongoing project i.e Redesigning the Semiconductor CURVE TRACER, here at CEDT, NSIT. I was to produce a sawtooth wave from a pwm signal using arduino nano and here are my observations: TASK:  To produce a sawtooth wave from PWM signal…

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ARM, Software

ARM Instruction Set(Part 1): Initialization

INTRODUCTION TO INSTRUCTION SETS I recently brought the ARM edition of the book Computer Organization and Design by Patterson and Hennessy from library. Half way through the book, I thought of sharing the content of this book in a more elaborated manner by making a series of tutorials on Arm Instruction Set.So, here’s part one of the series. Content Basic definitions Types of Instruction sets Architecture(ISA) General purpose register architecture Stack architecture Accumulator architecture Basic Definitions  …

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