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portal    

AT91 SAM Portal - innovative Atmel ARM based products
Tools, forum, projects and discussion on the ARM architecture from Atmel. A vendor-sponsored ecosystem for ARM developers.
preview: http://www.at91.com  

portal    

Linux4SAM
Welcome to the main starting point for Linux OS on SAM products. Its aim is to centralize information about Linux kernel and open source projects on ATMEL AT91 Smart ARM-based Microcontrollers (aka SAM). Our goal is to be an interface with open source projects that include AT91 support. We do not want to duplicate information but to link as much as possible to good resources available on the Web. Keep an eye on this website as it has...
preview: http://www.linux4sam.org  

portal    

SevenAndNines.com - ARM Portal by IAR (Vendor Portal)
SevensAndNines.com is a user community and a resource site for ARM developers. It has just been launched, and what is avaialble today is only the beginning. We will continue to add contents and resources of all kinds, and we hope that you would like to share your best tips and tricks with all our users.
preview: http://www.sevensandnines.com  

portal    

STM32 circle - Online Community for STM32-Primer Users
The STM32 Primer is designed to provide a complete toolset for STM32 that is fun and easy to use. Give it a try and learn about the features of the STM32 and the powerful ARM Cortex-M3 core. This is a new, and very cool, online community from STMicroelectronics promoting their new product with demos, online tutorials, code, and other cool items to get you 'excited' about STM32.
preview: http://www.stm32circle.com  

linux    

GoboLinux for ARM CPUs
The GoboLinux port for ARM CPUs has been happening with a focus on the armv5te, having the XScale as optimization target. The entire process of development has been done with the Bootstrap tool, described some sections below, which consists on a menu based interface to select and compile packages. All of this is free software and you're heavily encouraged to try it, enhance it and join us with the development of GoboLinux for the embedded. ...
preview: http://gobo.kundor.org  

linux    

L4Linux
L4Linux is a port of Linux to the L4 µ-kernel. L4Linux runs as an L4 server in user-mode, side-by-side with other L4 applications (e.g. real-time components). It is currently running on x86 and ARM and it is binary compatible with the native Linux kernels.
preview: http://www.l4hq.org  

linux    

The ARM Linux Project
ARM Linux is a port of the successful Linux Operating System to ARM processor based machines mainly by Russell King with contributions from others. The following, which is taken from the Linux Kernel README, describes the Linux system well:
preview: http://www.arm.linux.org.uk