From: Bjorn Helgaas <bjorn.helgaas@hp.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: evt@texelsoft.com,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-ide@vger.kernel.org
Subject: Re: CSB5 IDE does not fully support native mode??
Date: Thu, 26 May 2005 10:55:38 -0600 [thread overview]
Message-ID: <200505261055.38137.bjorn.helgaas@hp.com> (raw)
In-Reply-To: <1117117463.5743.149.camel@localhost.localdomain>
On Thursday 26 May 2005 8:24 am, Alan Cox wrote:
> In order to keep the legacy world from falling to bits IDE and VGA have
> some ugly hacks in the PCI spec.
>
> In legacy mode an IDE device appears at the "old" standard IDE addresses
> and uses an external IRQ pin wired to the ISA IRQ lines (14 or 15). In
> native mode it behaves like a PCI device, honouring the PCI bars and
> using the PCI INT lines.
This has been niggling in my mind for a while -- in legacy mode,
the device should use IRQ 14/15. But I think we still call
pci_enable_device(), which sets up IRQ routing according to
the usual PCI rules. Should we be using pci_enable_device()
at all in legacy mode?
next prev parent reply other threads:[~2005-05-26 16:55 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-05-24 20:26 evt
2005-05-26 14:24 ` Alan Cox
2005-05-26 16:55 ` Bjorn Helgaas [this message]
2005-05-26 17:22 ` Alan Cox
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