RTEMS on MVME230X

[Eric Valette]

Till Straumann wrote:
> 
> Is there anybody out there running RTEMS on a MVME230X  board (or any
> other powerpc-VME board)?
> 
> I had severe problems with the bootloader: (Eric, are you still
> maintaining this?)
Yep.


>  - the kernel `start.S' code corrupts the residual passed by the
> bootloader (see my last message)

Not here and not for the last guy that tested mvme2307...

>  - the bootloader re-configures the pci devices without considering the
> Tundra-Universe
>      (PCI-VME bridge) 's PCI slave image settings. This means that
> devices can be reconfigured to
>      occupy an address range that is already in use by the Universe,
> i.e. a range where the Universe maps
>      VME addresses.

Note that this is documeneted in the README.MVME2307 :-)

>  - The USE_PPCBUG compiler/assembler switch should take care of
> disabling the MMU.

I gave up trying to use PPCBUG as it does not work with cache on...

> IMO, the bootloader should either not re-configure PCI or it should be
> able to properly set up or disable the Universe. In any case, it should
> at least _print_a_message_ when doing any re-configuration.

We can debate this for years. The debate has already taken place on the
linux-ppc mailling list. The reason for reconfiguring the PCI devices is
to compres the PCI address space so that a single BAT is usable and let
one available for VME address space :-)

Note that the guy how origaly wrote the boot loader even decided to
reconfigure the system using a CHRP map rather than a Prep MAP to have
contiguous memory MAP...


> Also, the user should be advised to manually disable the Universe's PCI
> slave if the reconfiguration is still done.

Again this is documented... So do not complain too much if you do not
read the doc...


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