Tutorial: Device Driver Programming in MINIX 3

[Niek Linnenbank]

Hi all,

I wrote a tutorial on programming device drivers in MINIX 3. Ever
since I started
with MINIX and operating systems, I really missed a tutorial like
this, so I hope I can make somebody happy with it :-) It can be found
in the developers guide on the wiki:

http://wiki.minix3.org/en/DevelopersGuide/DriverProgramming

Regards,

Niek

[Althaf K Backer]

Wow, nice work, Niek you are filling the gap that Minix currently
have , excellent work , expecting like this more from you :)
Thanking you for this effort. :)

Althaf

[Arun Thomas]

Very impressive work, Niek. Thanks a lot.

Arun

[Debjit Biswas]

Now that's the document I have been waiting for. Nice work :-)

[Iggo]

Great Niek!

Thank you very much!!

[Evgeniy Ivanov]

Great work!

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Evgeniy Ivanov

[m r]

nice...

[javadimon]

It's just great!
Thank's.

[jonyii]

Very useful in deed.

[tota]

Very impressive work, Niek. Thanks!

I have question. "Example 4: RS232 Serial Port" - When it will be
written?
RS-232 it is very important!

Tota

[Julian G. D.]

WoWW, thanks a lot!
This is the document I've been looking for.
Who wants to write a usb device driver with me?

[Julian G. D.]

Yes, will you write that Example?

[Alex Vedenev]

Great work, Niek!
Thank you very much!
I will study this guide and learn how to write drivers. Now it should be easier.

среда, 2 декабря 2009 г., 6:11:21 UTC+6 пользователь Niek Linnenbank написал:

[Patrick Mc(avery]

I am grateful too.

I don't know that much about writing drivers... Do you think it is
easier to write drivers for Minix then let's say BSD. I was thinking
that since the drivers are in userland it might be.

Thanks

[Niek Linnenbank]

Good to hear my tutorial is useful to you.

Writing a userland driver could indeed help make the task easier, especially in MINIX. If you make a serious mistake

while developing (happens more often than you think), you won't crash your entire machine, but only your driver.

On the other hand, with a userland driver you still need to know C well and study any relevant hardware documentation.

I can also recommend you to use Qemu (http://wiki.qemu.org) for learning how to write drivers. Qemu allows you to

inspect the emulated device and debug your kernel with GDB.

Regards,

Niek

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Niek Linnenbank

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BLOG: http://nieklinnenbank.wordpress.com/
FUN:    http://www.FreeNOS.org/

[vengat babu]

hi sir
     I'm currently working on developing a reasonably sized kernel module in minix os.I need to develop and run a kernel in that os. but m not familiar with minix.please help to achieve the target. send me the complete command with procedure....thank you.!!!! I'm eagerly waiting for your priceless reply..
                                                                      

[vengat babu]

[vengat babu]

[vengat babu]

[Nicholas Heath]

This is very well written. Thanks!

[Haïssam Razouk]

Hello,

Thanks a lot for this great tutorial ! Very clear and understandable, though I'm a newbie and I'll work more on this.

I had a simple question -maybe it's more a simple disambiguation-.

On OSDev, it is stated :

For example, if code does "while(update_in_progress_flag != clear)" and then starts reading all the time and date registers, then the update could begin immediately after the "Update in progress" flag was checked and the code could still read dodgy/inconsistent values.

But in your code, we only have :

 /*
  68      * Wait until the Update In Progress (UIP) flag is clear, meaning
  69      * that the RTC registers are in a stable state.
  70      */
  71     while (!(cmos_read_byte(RTC_STATUS_A) & RTC_UIP))
  72     {
  73         ;
  74     }

Does it mean that the code is partly unstable, as stated on OSDev ?

If it is so, it could be a good exercise to rewrite it and enhance it.

Thanks a lot for your time and work !

Haïssam.

[Niek Linnenbank]

You're welcome. Im glad you like the tutorial.

It is possible you are right. I wrote this tutorial long ago, so I forgot about the details already.

Niek

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[David van Moolenbroek]

Hey Haïssam,

On Saturday, November 1, 2014 6:16:14 PM UTC+1, Haïssam Razouk wrote:

Does it mean that the code is partly unstable, as stated on OSDev ?

Great observation; you're absolutely right. In fact, MINIX3 is not a hard-realtime OS, and thus no guarantees are given about scheduling of processes (including drivers). As such, the UIP flag is not useful for getting a stable RTC value at all. One solution would be the interrupt-based approach mentioned on the same OSDev page [1]; another would consist of retrieving the RTC values multiple times and doing something "smart" based on the differences if any.

Contributions to driver programming wiki page are certainly welcome!

Regards,
David

[1] http://wiki.osdev.org/CMOS

[Juan Carlos Ferrel]

Hello, I am using Minix 3.2.1 and I am trying to follow the example but in my machine does not work there is a lot of indefinites 

Thanks

[Yassmina Eddarkaoui]

hi, I want, you make a tutoriel that explain how install Minx3 with Ubuntu, please.

[David van Moolenbroek]

Hi,

On Wednesday, March 18, 2015 at 7:15:40 AM UTC+1, Yassmina Eddarkaoui wrote:

hi, I want, you make a tutoriel that explain how install Minx3 with Ubuntu, please.

Please don't hijack threads to ask unrelated questions. There already is a page that contains what you are looking for:

http://wiki.minix3.org/doku.php?id=developersguide:crosscompiling

Regards,
David

[johnswolter]

...& as I briefly look @ ...

" /*
68 * Wait until the Update In Progress (UIP) flag is clear, meaning
69 * that the RTC registers are in a stable state.
70 */
71 while (!(cmos_read_byte(RTC_STATUS_A) & RTC_UIP))
72 {
73 ;
74 }
"

....I'm thinking it looks like an infinite looo...op.

[johnswolter]

Thank you for mentioning http://wiki.osdev.org. Appears to be a great resource for writing not only drivers but entire operating systems.

[Yassmina Eddarkaoui]

Thanks for your help, I am just a beginner on MINIX3

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