From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Cc: Linux/PPC Development <linuxppc-dev@ozlabs.org>
Subject: Re: Broken PCI on Sequoia
Date: Sat, 31 Jan 2009 08:30:24 +1100 [thread overview]
Message-ID: <1233351024.18767.32.camel@pasglop> (raw)
In-Reply-To: <1233349323.18767.31.camel@pasglop>
> For that sort of 4xx PHB (ie, the PCI 2.x ones, not the PCI-X nor the
> PCI-E), we only know how to program 32-bit of PLB address. IE. The old
> code would have cropped the plb_addr when writing to the register, the
> new code complains.
>
> I suspect some implementation support a register to put the "high" part
> of the PLB address, and that it already contains 1, so the old code
> would have worked by chance, the new code doesn't because it bails out.
Hrm... from the doco it's also one 32-bit register... I'm starting to
think that those guys always assume the top 1 bit is set or something
like that ...
The doc is unclear. Maybe somebody form AMCC can confirm ?
Cheers,
Ben.
next prev parent reply other threads:[~2009-01-30 21:30 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-29 17:37 Broken PCI on Sequoia Geert Uytterhoeven
2009-01-29 22:11 ` Benjamin Herrenschmidt
2009-01-30 0:18 ` Josh Boyer
2009-01-30 2:08 ` Benjamin Herrenschmidt
2009-01-30 12:35 ` Geert Uytterhoeven
2009-01-30 21:02 ` Benjamin Herrenschmidt
2009-01-30 21:30 ` Benjamin Herrenschmidt [this message]
2009-01-31 1:19 ` Feng Kan
2009-01-31 4:42 ` Benjamin Herrenschmidt
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