From: Bjorn Helgaas <bjorn.helgaas@hp.com>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Russell King <rmk@arm.linux.org.uk>,
Linux Kernel list <linux-kernel@vger.kernel.org>
Subject: Re: uart_match_port() question
Date: Wed, 7 Dec 2005 16:36:33 -0700 [thread overview]
Message-ID: <200512071636.33901.bjorn.helgaas@hp.com> (raw)
In-Reply-To: <1133997226.7168.93.camel@gaston>
On Wednesday 07 December 2005 4:13 pm, Benjamin Herrenschmidt wrote:
> ... Part of the problem here is for example PIO. There is no such
> thing as PIO on a PowerPC, it's purely a PCI abstraction, thus inX/outX
> will only work once the PCI host briges have been discovered and their
> IO space mapped (setup_arch() time, but I definitely want my early
> console earlier).
ia64 has a similar problem, but it's a bit easier because firmware
configures and tells us about the legacy (0-64K) I/O port space.
So we do have to look up the MMIO base where those I/O ports get
mapped, but that's basically the first thing in setup_arch(). We
don't do much before that, so it hasn't been worthwhile to make
the console work earlier.
next prev parent reply other threads:[~2005-12-07 23:36 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-11-27 0:21 uart_match_port() question Benjamin Herrenschmidt
2005-11-28 11:30 ` Russell King
2005-11-28 11:36 ` Benjamin Herrenschmidt
2005-12-07 22:15 ` Bjorn Helgaas
2005-12-07 23:13 ` Benjamin Herrenschmidt
2005-12-07 23:36 ` Bjorn Helgaas [this message]
2005-12-08 0:17 ` Benjamin Herrenschmidt
2005-12-08 16:26 ` Bjorn Helgaas
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