[U-Boot-Users] Need help booting an unsupported OS on ARM

[Rod Landers]

Thanks Wolfgang,

That only seems logical.  I'm not exactly sure why I didn't think of
checking out Linux for examples.

-Rod


On Sun, 13 Feb 2005 01:15:12 +0100, Wolfgang Denk <wd at denx.de> wrote:
> In message <2da76b6505021215452596cc8a at mail.gmail.com> you wrote:
> > I am trying to use U-Boot to start up a home grown OS.  How can I make
> > my OS a little more U-Boot friendly, or visa-versa?  The specific
> 
> You can do both, but in general you don't have to.
> 
> The most trivial thing is to start your OS using the "go"  command  -
> assuming that the OS does not require to receive any information from
> the  boot loader. Or, assuming the OS uses ELF files, you can use the
> "bootelf" copmmand, too.
> 
> > problem I'm having is that when I issue a SWI on the arm, the U-Boot
> > interrupt routines get used instead of mine.
> 
> Your OS is expected  to  install  it's  own  interrupt  handlers,  of
> course.
> 
> > I can see why that is happening because the vectors in the flash
> > address point to the U-Boot routines, but I'm wondering if there is a
> 
> This is only before relocation.
> 
> > way to set a secondary jump so that my routines are used.
> 
> You may want to peek for example at the  Linux  kernel  code  how  to
> install your own interrupt handlers.
> 
> Best regards,
> 
> Wolfgang Denk
> 
> --
> Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
> Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
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>