From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Arnd Bergmann <arnd@arndb.de>
Cc: linuxppc-dev@ozlabs.org, Carl Love <cel@us.ibm.com>
Subject: Re: Help with an MMIO register read function
Date: Sat, 11 Nov 2006 12:46:46 +1100 [thread overview]
Message-ID: <1163209606.4982.201.camel@localhost.localdomain> (raw)
In-Reply-To: <200611110010.28788.arnd@arndb.de>
On Sat, 2006-11-11 at 00:10 +0100, Arnd Bergmann wrote:
> On Friday 10 November 2006 23:57, Carl Love wrote:
> > I expect the SBI values to be 0x2000000 not 0x200000000. The L2 debug
> > value should be 0x6 not 0x600000000000000. It seems like the bits are
> > there but shifted from where I would expect them to be. Anyone have any
> > thoughts as to what is wrong?
>
> Hmm, maybe you confused the bit order in the specification? IBM
> counts the MSB as bit 0, while everyone else counts the LSB as
> bit 0.
I think in this case the problem is that he's using readq() which
byteswaps.
Ben.
next prev parent reply other threads:[~2006-11-11 1:46 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-10 22:57 Help with an MMIO register read function Carl Love
2006-11-10 23:10 ` Arnd Bergmann
2006-11-11 1:46 ` Benjamin Herrenschmidt [this message]
2006-11-13 17:06 ` Carl Love
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