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== About Embedded XINU ==
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= Welcome SIGCSE 2024! =
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To find RISC-V assignments and writeups, see [https://github.com/a1g3/riscv-xinu-hw].  We have instructions for running Embedded Xinu on the Sipeed Nezha below.  Check out "Building an Embedded Xinu Laboratory".  For solutions to homework assignments, please email dennis (dot) brylow (at) marquette.edu or alexander (dot) gebhard (at) marquette.edu.
  
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Embedded XINU is an ongoing research and implementation project in the area of Operating Systems and Embedded Systems.  Its goal is to port the [http://en.wikipedia.org/wiki/XINU XINU Operating System] to the MIPS platform by specifically targeting LinkSys WRT54GL routers, with the hope that it can soon be used as the basis for classes on Operating Systems, Embedded Systems, and Networking classes.
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= Introduction =
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'''Embedded Xinu''' is an ongoing research and implementation project in the area of Operating Systems and Embedded Systems.  Its original goal was to re-implement and port the [[Xinu|Xinu Operating System]] to several embedded MIPS platforms, such as the Linksys [[WRT54GL]] router.  Since then, Embedded Xinu has been ported to other platforms, such as the [[mipsel-qemu|QEMU MIPSel virtual environment]] and the [[Raspberry Pi]]; see the [[list of supported platforms]].  Although Embedded Xinu is still being developed and ported to new platforms, a laboratory environment and curriculum materials are already in use for courses in Operating Systems, Hardware Systems, Embedded Systems, Networking, and Compilers at Marquette University and other colleges/universities.
  
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The Embedded XINU project was conceived and is supervised by Dr. Dennis Brylow and is being conducted by both graduate and undergraduate students in the [http://mscs.mu.edu Math, Statistics, & Computer Science] department of [http://mu.edu/ Marquette University] in Milwaukee, Wisconsin.  The first major phase of work on Embedded XINU took place in the Summer of 2006.
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The Embedded Xinu project was conceived and is supervised by [https://www.cs.mu.edu/~brylow/ Dr. Dennis Brylow] and is being conducted by both graduate and undergraduate students in the [[Systems Laboratory]] in the [https://www.cs.mu.edu/ Computer Science] department of [https://www.mu.edu/ Marquette University] in Milwaukee, Wisconsin.  The first major phase of work on Embedded Xinu began in the Summer of 2006.
  
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== Guides to Replicate Our Work ==
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Our project partners include [https://www.cse.buffalo.edu/~bina/ Dr. Bina Ramamurthy] at University of Buffalo (with whom we shared an [https://www.nsf.gov/pubs/2009/nsf09529/nsf09529.html NSF CCLI] grant), [https://cs.olemiss.edu/~ruth/wiki/doku.php Dr. Paul Ruth] at University of Mississippi, and [https://www.cs.purdue.edu/people/comer Dr. Doug Comer] (father of Xinu) at Purdue University.
  
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In this section we are developing instructions so that other groups can benefit from the work we are doing.  These guides can be followed more or less in order to create a relatively inexpensive platform for a custom operating system.  As our work develops further, there will be more XINU-specific information.
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== Teaching With Embedded Xinu ==
  
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# [[HOWTO:Install OpenWRT|Install OpenWRT]]
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* For curriculum guidance on adopting or adapting Embedded Xinu for undergraduate coursework, see [[Teaching With Xinu]].
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# [[HOWTO:Modify the Linksys hardware|Modify the Linksys hardware]]
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* Workshops have been held regarding teaching with Embedded Xinu.  For example, the [https://www.cs.olemiss.edu/acmse2010/pdf/xinu.pdf Teaching With Embedded Xinu Workshop] at [https://www.cs.olemiss.edu/acmse2010/Home.htm ACMSE 2010] in Oxford, Mississippi (Ole Miss campus) shared ready-made curriculum resources that have been used successfully to teach hardware systems, operating systems, realtime/embedded systems, networking, and compilers with the Embedded Xinu platform at several colleges/universities.
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# [[HOWTO:Connect to a modified router|Connect to a modified router]]
 
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# [[HOWTO:Run your own code|Run your own code]]
 
  
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== Internal Documentation ==
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== Building an Embedded Xinu Laboratory ==
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After this point is our "scratchpad" of information collected mostly during Summer 2006 as research and experimentation was done.  It is possible that there is more detailed information here on a few topics, but it is less organized and not as ready for public consumption.
 
  
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=== Project Outline ===
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In this section we are developing instructions so that other groups can benefit from the work we are doing.  These guides can be followed more or less in order to create a relatively inexpensive platform for a custom operating system.  As our work develops further, there will be more Xinu-specific information.
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* Goals
 
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# '''Infect''' WRT54GL Routers with a XINU kernel
 
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# '''Develop''' XINU to a point where it can '''control''' the router's basic functions
 
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# '''Use''' this platform for a course in '''embedded systems''' and/or '''networking'''
 
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* Hardware (Mod that LinkSys!)
 
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** [[Why we add serial ports|'''Why''' we add serial ports]]
 
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** '''How''' we add serial ports
 
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*** [[Pictures]] of building
 
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*** [[Wiring|Wiring Diagrams]]
 
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*** [[Chips|Chip Diagrams]]
 
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* Software
 
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** [[How to connect]] to a modified router
 
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** Our Project's [[Directory Structure]]
 
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** And then there was light: the [[Common Firmware Environment]]
 
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*** Interacting with the [[CFE Command Line Interface]]
 
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*** Fun freebies in the [[CFE API]]
 
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*** How code can [[Interface with CFE]]
 
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** [[OpenWRT]] (When all else fails, steal it from Linux!)
 
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*** Important [[OpenWRT places of interest]]
 
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** [[XINU]] (an O/S of our own)
 
  
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=== More Research ===
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# Obtain a [[List of supported platforms|supported platform]].
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* TODO: (concrete tasks)
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# (Required if using a Linksys/Asus router) [[HOWTO:Modify the Linksys hardware|Modify the Linksys hardware]] or [[HOWTO:Modify the ASUS hardware|Modify the ASUS hardware]]
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** XINU Tasks
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## [[HOWTO:Connect to a modified router|Connect to a modified router]]
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*** Complete wired NIC driver.
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# [[HOWTO:Build Xinu|Build Xinu]]
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*** Start on wireless NIC driver and "RoboSwitch".
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# [[HOWTO:Deploy Xinu|Deploy Xinu]]
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*** Integrate XINU TCP/IP stack.
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# (Optional) [[HOWTO:Build Backend Pool|Build a pool of backends]]
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* TOTHINK: (abstract goals and wishlists)
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# (Recommended) [[HOWTO:Backup your router|Backup your router's factory configuration]]
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** Learn more about the [[memory structure]] and underlying hardware.
 
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** How should the loader discover hardware parameters if CFE does not implement device enumeration?
 
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** How do we safely access flash memory without bricking the router?
 
  
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== Useful Links ==
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== Other Embedded Xinu Information ==
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* http://www.openwrt.org
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* http://linux.junsun.net/porting-howto/ - Linux MIPS Porting Guide
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* MIPS [[processor]]
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* http://www.version6.net/gallery/WRT54GL - WRT54GL Internals Pics Gallery
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* Main [[memory]]
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* http://en.wikipedia.org/wiki/WRT54G - WRT54G Wiki
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* [[Exception and Interrupt Handling]]
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* http://en.wikipedia.org/wiki/MIPS_architecture - MIPS Architecture
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* [[UART driver]]
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* http://www.redhat.com/docs/manuals/enterprise/RHEL-4-Manual/gnu-linker/ - How To Write Linker Scripts
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* [[TTY driver]]
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* http://www.embedded.com/shared/printableArticle.jhtml;jsessionid=0LLEHS3YT5KWUQSNDBCSKHSCJUMEIJVN?articleID=9900048 - Linux Porting Guide
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* [[Switch driver]]
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* http://courses.cs.vt.edu/~cs2504/spring2006/MIPSDocs/MD00090-2B-MIPS32PRA-AFP-02.50.pdf - MIPS32 Architecture For Programmers
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* [[Networking]]
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* [[Flash memory]]
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* [[Flashing firmware]]
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* [[EJTAG|Enhanced Joint Test Action Group]] debugger
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* [[Standard library]]
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* [[XinuPhone]] Internet telephony
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* [[Router Recovery]] aka "Debricking"
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* [[Development]]
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* [[Contributors]]
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----
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<small><small><small>The Xinu Lab is brought to you in part by [[XMMS|M&M's]].</small></small></small>
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Latest revision as of 23:13, 23 March 2024

Welcome SIGCSE 2024!

To find RISC-V assignments and writeups, see [1]. We have instructions for running Embedded Xinu on the Sipeed Nezha below. Check out "Building an Embedded Xinu Laboratory". For solutions to homework assignments, please email dennis (dot) brylow (at) marquette.edu or alexander (dot) gebhard (at) marquette.edu.

Introduction

Embedded Xinu is an ongoing research and implementation project in the area of Operating Systems and Embedded Systems. Its original goal was to re-implement and port the Xinu Operating System to several embedded MIPS platforms, such as the Linksys WRT54GL router. Since then, Embedded Xinu has been ported to other platforms, such as the QEMU MIPSel virtual environment and the Raspberry Pi; see the list of supported platforms. Although Embedded Xinu is still being developed and ported to new platforms, a laboratory environment and curriculum materials are already in use for courses in Operating Systems, Hardware Systems, Embedded Systems, Networking, and Compilers at Marquette University and other colleges/universities.

The Embedded Xinu project was conceived and is supervised by Dr. Dennis Brylow and is being conducted by both graduate and undergraduate students in the Systems Laboratory in the Computer Science department of Marquette University in Milwaukee, Wisconsin. The first major phase of work on Embedded Xinu began in the Summer of 2006.

Our project partners include Dr. Bina Ramamurthy at University of Buffalo (with whom we shared an NSF CCLI grant), Dr. Paul Ruth at University of Mississippi, and Dr. Doug Comer (father of Xinu) at Purdue University.

Teaching With Embedded Xinu

  • For curriculum guidance on adopting or adapting Embedded Xinu for undergraduate coursework, see Teaching With Xinu.
  • Workshops have been held regarding teaching with Embedded Xinu. For example, the Teaching With Embedded Xinu Workshop at ACMSE 2010 in Oxford, Mississippi (Ole Miss campus) shared ready-made curriculum resources that have been used successfully to teach hardware systems, operating systems, realtime/embedded systems, networking, and compilers with the Embedded Xinu platform at several colleges/universities.

Building an Embedded Xinu Laboratory

In this section we are developing instructions so that other groups can benefit from the work we are doing. These guides can be followed more or less in order to create a relatively inexpensive platform for a custom operating system. As our work develops further, there will be more Xinu-specific information.

  1. Obtain a supported platform.
  2. (Required if using a Linksys/Asus router) Modify the Linksys hardware or Modify the ASUS hardware
    1. Connect to a modified router
  3. Build Xinu
  4. Deploy Xinu
  5. (Optional) Build a pool of backends
  6. (Recommended) Backup your router's factory configuration

Other Embedded Xinu Information

The Xinu Lab is brought to you in part by M&M's.

Retrieved from "https://xinu.cs.mu.edu/index.php?title=Main_Page&oldid=4419"