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a simple homebrew operating system for the Raspberry Pi
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jeremiahsimonsen/vmwos
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The VMWos -- an operating system by Vincent M. Weaver History: ~~~~~~~~ This project originated from code written for the Spring 2015 ECE598 Advanced Operating System class at the University of Maine. Building: ~~~~~~~~~ You will either need to build natively on an ARM machine or cross compile. Quickstart Debian: apt-get install genromfs gcc-arm-none-eabi To build natively, edit Makefile.inc and make the CROSS variable be empty. Otherwise, edit Makefile.inc to point to your cross compiler. It is possible to build this on OSX and Windows, I should update with instructions. Running "make" should build kernel/kernel.img Installing: ~~~~~~~~~~~ You need a memory key with an existing OS install that you don't care about (raspbian works great). Mount the boot directory on that key, and copy kernel.img to a safe place. Now copy your built kernel/kernel.img overtop of the existing kernel.img Required Hardware: ~~~~~~~~~~~~~~~~~~ Currently VMWos runs on any Raspberry Pi Model A, B, B+ or A+. It will not run on a Raspberry Pi 2 without some changes to the OS (but it should be possible). It will drive an HDMI screen, but has no support for USB input. To get full input/output you will need to buy a USB/Serial adapter and connect to another machine running a terminal program such as minicom. Using: ~~~~~~ It is currently fairly limited. Assuming you have booted properly into the shell, you can run "help" to get a list of supported commands. Compiling user programs: ~~~~~~~~~~~~~~~~~~~~~~~~ See the examples in ./userspace Right now you need to create a binary with -fPIC and use objcopy to create a RAW binary. I can't seem to find a working ARM binflt toolchain. There is a simple C library included ("vlibc") For more information: ~~~~~~~~~~~~~~~~~~~~~ See http://www.deater.net/weave/vmwprod/vmwos Vince Weaver [email protected] 27 February 2016
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