From: Matthew Wilcox <willy@thepuffingroup.com>
To: Grant Grundler <grundler@cup.hp.com>
Cc: parisc-linux@thepuffingroup.com
Subject: Re: [parisc-linux] PDC calls on the C3000
Date: Mon, 17 Jan 2000 13:34:21 -0500 [thread overview]
Message-ID: <20000117133421.O11300@thepuffingroup.com> (raw)
In-Reply-To: <200001171802.KAA18011@milano.cup.hp.com>; from Grant Grundler on Mon, Jan 17, 2000 at 10:02:59AM -0800
On Mon, Jan 17, 2000 at 10:02:59AM -0800, Grant Grundler wrote:
> I'm thinking the inconsistency is possibly a firmware "bug" where either
> the C360 or C3000 isn't behaving "right". Can anyone comment on what
> the expected behavior is?
I would class it as a bug, but I just needed a workaround for the
next month or two :-) BTW, the same thing happens on mkp's J5000.
> > 0xffff'ffff'c0xx'xxxx
> > becomes
> > 0x0000'0000'00xx'xxxx
> > and now PDC is happy, and so am I.
>
> This is where the hair on the back of my neck went up.
> The problem is on L-class and N-class machine we have
> I/O and memory addresses which are > 4GB. And PDC will really
> be confused on those platforms.
That won't be a problem. The tophys macro is used to convert kernel
virtual addresses into physical addresses. The kernel isn't going to
take more than 1GB of ram for its data segment :-)
We're not applying this macro to any other data type, don't worry.
next prev parent reply other threads:[~2000-01-17 19:37 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-01-17 15:57 [parisc-linux] PDC calls on the C3000 Matthew Wilcox
2000-01-17 18:02 ` Grant Grundler
2000-01-17 18:34 ` Matthew Wilcox [this message]
2000-01-17 18:48 ` Alex deVries
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