[GIT PULL] omap changes for v2.6.39 merge window
arnd at arndb.de
Wed Apr 6 21:44:44 EDT 2011
On Wednesday 06 April 2011, Catalin Marinas wrote:
> On Wed, 2011-04-06 at 00:19 +0100, Linus Walleij wrote:
> > 2011/4/1 Linus Torvalds <torvalds at linux-foundation.org>:
> > Basically it requires you to get the physical address and size of
> > each peripheral, then at offset -0x10 from the end address (usually
> > at even 4K pages), if you find the magic number 0xB105F00D
> > (ARM has a sense of humour, obviously) you can find something
> > alike the PCI IDs at offset -0x20, manufacturer ID, version number
> > and revision of the hardware.
> I don't think this was ever part of the AMBA specification. It was just
> some convention used within ARM for the PrimeCell peripherals. Other
> AMBA licensees did something else so it's not a reliable mechanism (I
> think ARM gave up on this as well in recent peripherals).
Do you think there is a way to get ARM ltd to make a better effort
at this with a future specification? I suppose it would be extremely
helpful if there was a way to specify more of the required information,
and to require everybody to fill in correct data, in the same way that
architecture compliance gets enforced on the CPU core.
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