* IMAP_ADDR is virtual or physical address?
@ 2006-02-15 21:41 dibacco
2006-02-15 21:36 ` Kumar Gala
0 siblings, 1 reply; 2+ messages in thread
From: dibacco @ 2006-02-15 21:41 UTC (permalink / raw)
To: linuxppc-embedded
I'm wondering if IMAP_ADDR is a virtual address or a physical one. Normal=
ly I see things like this in drivers:
static volatile immap_t *immr =3D (immap_t *) IMAP_ADDR;
It seems therefore a virtual address.
But I can see the same also in some u-boot code where I imagine we are ac=
cessing physical addresses.
Clear my doubt please!!
Bye,
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: IMAP_ADDR is virtual or physical address?
2006-02-15 21:41 IMAP_ADDR is virtual or physical address? dibacco
@ 2006-02-15 21:36 ` Kumar Gala
0 siblings, 0 replies; 2+ messages in thread
From: Kumar Gala @ 2006-02-15 21:36 UTC (permalink / raw)
To: dibacco@inwind.it; +Cc: linuxppc-embedded
On Wed, 15 Feb 2006, dibacco@inwind.it wrote:
> I'm wondering if IMAP_ADDR is a virtual address or a physical one. Normally I see things like this in drivers:
>
> static volatile immap_t *immr = (immap_t *) IMAP_ADDR;
>
> It seems therefore a virtual address.
IMAP_ADDR tends to be a physical address, however its mapped 1:1 in the
kernel via io_block_mapping() on a number of systems to get the 1:1
mapping.
This is somewhat frowned upon, and drivers should really do their own
ioremap() with a physical address for IMAP_ADDR.
>
> But I can see the same also in some u-boot code where I imagine we are accessing physical addresses.
>
> Clear my doubt please!!
In u-boot everything is mapped 1:1 so there is no difference between virt
and phys addrs.
- kumar
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2006-02-15 21:41 IMAP_ADDR is virtual or physical address? dibacco
2006-02-15 21:36 ` Kumar Gala
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