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From: Sylvestre Gallon <ccna.syl@gmail.com>
To: Arnar Mar Sig <antab@freebsd.org>
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Cc: freebsd-arm@freebsd.org
Subject: Re: Atmel at91sam9261-ek support.
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On Tue, Mar 24, 2009 at 1:16 PM, Arnar Mar Sig <antab@freebsd.org> wrote:
>
> On Mar 24, 2009, at 10:10 AM, Sylvestre Gallon wrote:
>
>
> Code is in p4:
> http://perforce.freebsd.org/depotTreeBrowser.cgi?FSPC=//depot/projects/avr32/src/sys/avr32/avr32&HIDEDEL=NO
>
> Note the driver dose not use KVA, instead it uses unmapped memory segment in
> avr32, but that only works for 5 of the 6 chips select so it will be needed
> later on.
Thanks I will take a look on it :)
>
>
> cpu_devs can be in hints, but i dont know about pmap_devmap. on avr32 all
> devices registers can be addressed without mmu lookups.
>
It is not a problem for the pmap_devmap because all at91 have the same
memory mapping :
|----------------------------------------| 0x0000 0000
| Internal Memory Mapping |
|----------------------------------------| 0x1000 0000
| EBI 0 |
|----------------------------------------| 0x2000 0000
| EBI 1 |
|----------------------------------------| 0x3000 0000
| EBI ... |
|----------------------------------------| 0xX000 0000
| Undifined (Abort) |
|----------------------------------------| 0xF000 0000
| Internal peripherals |
|----------------------------------------| 0xFFFF FFFF
So we can have the same devmap for all at91 :
static const struct pmap_devmap at91_devmap[] = {
/*
* Map the on-board devices VA == PA so that we can access them
* with the MMU on or off.
*/
{
AT91_REGS_VA,
AT91_REGS_PA,
AT91_REGS_SIZE,
VM_PROT_READ|VM_PROT_WRITE,
PTE_NOCACHE,
},
{
AT91_MEMS_VA,
AT91_MEMS_PA,
AT91_MEMS_SIZE,
VM_PROT_READ|VM_PROT_WRITE,
PTE_NOCACHE,
},
{
0,
0,
0,
0,
0,
}
};
--
Sylvestre Gallon (http://devsyl.blogspot.com)
Fifth Grade Student @ Epitech & Researcher @ LSE
R&D @ Rathaxes (http://www.rathaxes.org)