[U-Boot] mpc83xx U-boot questions

[Yuke Tian <ytian@bnl.gov>]

Hi,

Sorry to ask the stupid question. I did study the RTEMS for a while and
am sure the tool set are correct (from ftp://www.rtems.com), otherwise
they will not build RTEMS.  All the tools and development are done in
linux (RHLE5).  I just got this board using U-boot and not sure about
it. David's manual help a lot. Thanks.

Yuke


Jerry Van Baren wrote:
> Yuke Tian wrote:
>> Hi David,
>>
>> Thank you for your kind response. What I am doing is to try to load the
>> RTEMS (a kind of open source real time operating system) image to the
>> board. It has a BSP for this board. All the tools I used are targeting
>> powerpc and tailed for this board.  But the final executable format is
>> .exe. I am not sure if this format is good to download and run on the
>> board using U-boot.  I just happen to know there is a mkimage utility
>> from U-boot.
>
> 1) You need to do a lot of reading: books - see below - and on-line
> documentation such as <http://www.denx.de/wiki/U-Boot/Documentation>.
> Also the RTEMS documentation
>   <http://www.rtems.com/wiki/index.php/Quick_Start>
>   <http://www.rtems.com/onlinedocs.html>
> You have to have some fundamental knowledge before you can ask
> questions that we can answer.
>
> Note that you aren't the first to ask the question you started out
> with, see the README file:
> <http://git.denx.de/?p=u-boot.git;a=blob;f=README;h=ccd839ca25828c2be9d2ac576259b443d0704792;hb=HEAD#l3859>
>
>
> 2) Some (idiot) tools create non-Windows binary executables as .exe
> files.  This is nonstandard in terms of Windows executables and is
> nonstandard in terms non-Windows executables.  As a result, we cannot
> say *anything* about your question WRT your gcc compiler producing a
> .exe file.
>
> If you list/dump/edit the .exe file, are the first three bytes the
> characters "ELF"?  If so, it isn't a Windows executable, but we still
> don't know much about what it *is.*  If it doesn't say "ELF", it may
> be a Windows executable and is useless for your purposes, or it may be
> a raw binary file, but we still don't know much about what it *is.*
>
> 3) Your description of your toolset totally inadequate.  Who made it?
> Where did it come from?  How do you know it is a cross-PPC compiler?
> What version of gcc is it?  What is your host? Windows?
> Windows+cygwin? Linux? BSD? OSX? Solaris?
>
> It sounds like you need to be asking questions of your toolset
> provider (company if commercial), subscribe to the toolset's email
> list, and RTEMS email lists.
>   <http://www.rtems.com/wiki/index.php/RTEMSMailingLists>
>
> Good luck,
> gvb
>
>> Thank you,
>>
>> Yuke
>>
>> David Hawkins wrote:
>>> Hi Yuke,
>>>
>>>> I am new to U-boot. I have a mpc8313erdb board that already has U-boot
>>>> burned in flash. When the board reset, I get into U-boot (with U-boot
>>>> prompt =>).  My questions is: my gcc compiler produce a .exe file,
>>>> can I
>>>> just tftp this file to an address and run it (go) ? Or I need to
>>>> convert
>>>> it to some format (use mkimage) to run it ?
>>>>
>>>> Does the load address and entry address matters ?  Does anyone
>>>> happen to
>>>> know what is the correct load address for this board ?  One more
>>>> question, where do I get the mkimage for this board ?
>>> New to U-Boot and embedded systems, eh?
>>>
>>> If your gcc compiler is producing a .exe file, then
>>> you sound like you are working on a Windows machine,
>>> with say Cygwin. That particular version of gcc is
>>> for the *Windows OS* and the *Intel architecture*.
>>>
>>> The gcc compiler can be built for a specific processor
>>> type and OS. The Denx ELDK has a prebuilt version of
>>> gcc for the PowerPC on the MPC8313 that can be used
>>> to build both U-boot, stand-alone, and Linux
>>> applications. You would typically install the ELDK on
>>> a Linux machine (eg. an Intel-based laptop/desktop).
>>>
>>> You'll probably want to get yourself a copy of
>>>
>>> "Building Embedded Linux Systems", K. Yagmour, O'Reilly.
>>>
>>> and read it to learn some of the basics of embedded
>>> programming, and cross-platform development.
>>>
>>> If you want to run an executable from U-Boot, then you'll
>>> want to read the 'stand-alone applications' section of
>>> the DULG.
>>>
>>> http://www.denx.de/wiki/DULG/WebHome
>>>
>>> But if what you really want is a Linux application, then
>>> U-Boot will be used to boot Linux, and then your application
>>> will run under Linux.
>>>
>>> If you let us know exactly what you want your program to do,
>>> we can suggest the path of least-resistance for you.
>>>
>>> Cheers,
>>> Dave
>>>
>>>
>>>
>>>
>>
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>
>