MPC8240 PTE setup

Robert Morin rmorin at
Tue Apr 23 05:08:10 EST 2002

Hi Dan,

> > I have based my work on the Linux kernel 2.5.8 ....
> You don't want to use that yet :-)  Use the 2_4_devel kernel.

Ok, I will look to it.

> > ....I can see with my BDI2000 that the
> > MMU is not translating correctly virtual addresses to physical
> > addresses.
> The mmu always translates correctly, your programming of it
> is probably incorrect :-)

This is my problem and I think it's related to the pSOS bootloader
but I have difficulties pointing to the problem.

> > .... I made a patch to use a BAT instead of PTE but
> > this cause only to move the problem further upstream
> What BAT did you change, and to what?

In my file mxhost2_setup.c in function mxhost2_map_io(), I've

    io_block_mapping(0xfdf00000, 0xfdf00000, 0x00100000, _PAGE_IO );

as a work-around and modify also my find_bridge() to prevent using the

> > I have check the parameter passed with ioremap() and it's
> > ok. With the BDI2000, I get this with the phys command:
> >
> > 	phys 0xfdfd0000          (virtual address returned by ioremap)
> >
> > 	PHYS = 0xfffff000	END = 0xffffffff
> > instead of
> > 	PHYS 0xfdf40000 END = 0xfdffffff
> So, you did 'virt = ioremap(0xfdf40000)' and virt == 0xfdfd0000?
> Where did you call ioremap()?  Are you trying to remap the EUMB registers
> again (this is done in mpc10x_common.c for 82xx boards)?

I made my trace inside the mpc10x_common.c to have this result. I am
not making changes in the kernel, I want to keep as is as much as

For the moment, I will move my platform into 2_4_devel to see if
the situation improved.

> 	-- Dan



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