[ECOS] Redboot for MBX

[Barton Meeks <bartonm2002 at yahoo dot com>]

Anyone built a Redboot ROM for the MBX board recently?
I've used a MBX Redboot image that I downloaded off
the web, and I didn't have problems on my board, but I
can't get my build of Redboot to work.

I've tried to create Redboot images for both the
32-bit and 8-bit flash devices.

I'm creating Redboot as follows:

ecosconfig new mbx redboot
ecosconfig import redboot_ROM_40.ecm  /* I have 40MHz
board*/
ecosconfig tree
(modify ecos.ecc for 32-bit flash, if needed)
make

Using the 8-bit image, my first problem was
immediately after writing to the MSR to enable address
translation; I got a machine check at the 'sync' in
vectors.S:

        # Enable MMU so we can safely enable caches.
        lwi     r3,CYG_MSR   # interrupts enabled
later
        sync
        mtmsr   r3
        sync

Not knowing much about MMU setup, I turned off this
section by undefining CYGHWR_HAL_POWERPC_ENABLE_MMU.
Then I got a machine check at address 0xfffffffc when
cyg_hal_invoke_constructors was called a few lines
later.

Anyone have recent luck with building a Redboot ROM
for the MBX? My goal is to get a recent Redboot into
the 32-bit flash, because I have to remove the 8-bit
flash to use hardware plugged into bus connector on
the board.

And while I'm at it, where can I find more about the
compatibility of old Redboots with recent eCos
applications? Virtual vector compatibility? I remember
reading something about it, but I can't find it now.




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