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Embedded and Microcontrollers
Embedded Forum ARM on AVR: "Building the worst Linux PC ever"
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  • avr
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Related

ARM on AVR: "Building the worst Linux PC ever"

fustini
fustini over 13 years ago

A co-worker pasted this link into IRC this morning which put a big smile on my face:

 

Building the worst Linux PC ever

http://hackaday.com/2012/03/28/building-the-worst-linux-pc-ever/

 

the best course of action was emulating an ARM processor on an AVR. We’re not sure if we’re dealing with genius or madness here, but it did prove to be a valuable learning exercise in writing a modular ARM emulator.

 

http://dmitry.co/images/board2.jpg

 

Here's a speed-up video of it booting:

 

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How fast is it? [Dmitry] tells us it takes two hours to boot up to a bash prompt, and four more to load up Ubuntu and login. If you want a Megahertz rating, good luck; the effective clock speed is about 6.5 kilohertz.

 

Aside from ARM emulation, I found the use of an old SIMM very intriguing.  I've wanted more memory (not storage) in the past for an AVR project.  I've used Microchip's SPI SRAM chips, but they are still pretty paltry.  I didn't really consider that parallel DRAM would be possible to interface.

 

Anyone done any similarly masochistic projects that deserve a tip of the hat?

 

Cheers,

Drew

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  • YT2095
    YT2095 over 13 years ago +1
    When I first saw this, I thought about those STM32F4 Discovery boards, quite a few people have them and yet there is very little ever done with them (that I can find anyway), even though they are very…
  • Anonymous-58970
    Anonymous-58970 over 13 years ago

    i Wanted to do that with a arduino but i have a CHIP KIT MAX32 i wanted to put inputs like av video , sound, micro sd , keyboard and mouse with minimum parts to build it with COREBOOT hope this info will help a little

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  • fustini
    fustini over 13 years ago in reply to Anonymous-58970

    Interesting idea.  Although a different architecture than this project, I think the Max32 would be much more capable as it is 32-bit 80MHz.  I don't think it has a MMU, so I'm guessing similar trick would need to be done like with this project.

     

    Cheers,

    Drew

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  • Anonymous-58970
    Anonymous-58970 over 13 years ago in reply to fustini

    atm im trying to build the code for the interface the interface mouse and keyboard is on the web for arduinos the coreboot kinda tricky sense im still new to arduino

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  • Anonymous-58970
    Anonymous-58970 over 13 years ago in reply to fustini

    i found this

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  • fustini
    fustini over 13 years ago in reply to Anonymous-58970

    Ah ok.  It looks like there is a PS2 keyboard library and also a PS2 mouse library, and you are able to read from the respective objects.  Are the example Arduino sketches with the libraries not compiling?

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  • YT2095
    YT2095 over 13 years ago

    When I first saw this, I thought about those STM32F4 Discovery boards, quite a few people have them and yet there is very little ever done with them (that I can find anyway), even though they are very cheap (about a tenner).

    they have plenty GPIO and even an on board OTG USB connector (even though it`s one of those dreadful Micro A type connectors).

    and then build the lot into an old 1980s dumb terminal image

     

    edited to add: whilst soldering and thinking about things, it sprung to mind what a wonderful example of Turing Completeness/Equivalence this project is.

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  • Anonymous-58970
    Anonymous-58970 over 13 years ago in reply to YT2095

    Yea i hate those big usb types the uno32 and Max32 are mini usb im buy a arduino uno from radioshack im thinking of  making a PCB CNC set up to fab my own PCB i have some NXP mcu that need a board it will be like a arduino format  i have 4 nxp MCU lpc series

     

     

     

    IF IT DOABLE LULZ

     

    Message was edited by: Pablo Garcia

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