[U-Boot-Users] Running uC/OS-II on top of u-boot

[M C]

I'll try to stub out some of the porting functions and run the OS as a basic standalone app. Thanks!

> Date: Mon, 28 Apr 2008 14:16:59 -0700
> From: dwh at ovro.caltech.edu
> To: onyxtape at hotmail.com
> CC: u-boot-users at lists.sourceforge.net
> Subject: Re: [U-Boot-Users] Running uC/OS-II on top of u-boot
>
> Hi,
>
>> We have a PowerPC 440 EP (from a AMCC Yosemite evaluation kit)
>> and we are in the process of evaluating OSes for it. The
>> industrial strength ones (like vxWorks) are too much
>> feature-wise and money-wise, so we're hoping to try out uC/OS-II.
>>
>> If someone has tried to do this before, I have a few questions:
>>
>> - How do you configure it to run on top of u-boot? What commands are used?
>>
>> - Can the porting layer of uC/OS-II use some of the u-boot functions for PCI
>> and ethernet access?
>>
>> - Are there any existing instructions on how to build (or create a makefile)
>> uC/OS-II using the compilers supplied by the ELDK? I keep getting a failure
>> to "find entry symbol _start", even if I include the gcc libraries,
>> crtbegin.o, etc.
>>
>> I appreciate any help that I can get with my questions. Thanks!
>
> I have a Yosemite board, but haven't tried running uCOS-II
> on it.
>
> I would suggest creating a uCOS-II port that starts out life
> as a U-Boot stand-alone application.
>
> This way U-Boot sets up the processor, so your uCOS-II port
> doesn't have to deal with that.
>
> In the U-Boot stand-alone application, you would create the
> first uCOS-II task and initialize it. The other tasks
> would be in the same image loaded by U-Boot.
>
> You might even get away with using U-Boots console routines,
> however, since they're polled, you might want to create your
> own. If you do use them, you might want to use a mutex to
> protect the console routine use in multiple tasks.
>
> This scheme is analogous to starting uCOS-II from DOS in
> the Labrosse book. It should be possible to exit from uCOS-II
> back to the U-Boot console too.
>
> Cheers,
> Dave

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