From: David Howells <dhowells@redhat.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: dhowells@redhat.com, Andrew Morton <akpm@linux-foundation.org>,
torvalds@linux-foundation.org, linux-kernel@vger.kernel.org,
linux-am33-list@redhat.com
Subject: Re: [PATCH 5/6] MN10300: Add the MN10300/AM33 architecture to the kernel [try #5]
Date: Mon, 12 Nov 2007 12:19:04 +0000 [thread overview]
Message-ID: <4094.1194869944@redhat.com> (raw)
In-Reply-To: <20071111164244.52a17203@the-village.bc.nu>
Alan Cox <alan@lxorguk.ukuu.org.uk> wrote:
> > Some are part of the CPU core and affect things like CPU core itself, CPU
> > caches, MMU/TLB and exceptions/interrupts. Others are on-silicon devices
> > such as the serial ports, the bus controller, the SDRAM controller.
>
> How are they addressed - as CPU registers or as memory/IO space ?
Well, they're all accessed as memory locations within a special range of
addresses (all of 0xCxxxxxxx and 0xDxxxxxxx). This includes the magic CPU
registers. This is hard coded by the CPU before the MMU gets its hands on the
addresses, AFAIK.
I also wondered what about the boot wrapper (the kernel decompressor): Is that
permitted to use readb() and co?
David
next prev parent reply other threads:[~2007-11-12 12:19 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-09 15:34 [PATCH 0/6] MN10300: Add the MN10300 architecture to Linux kernel [try #5] David Howells
2007-11-09 15:34 ` [PATCH 1/6] Suppress A.OUT library support if !CONFIG_BINFMT_AOUT " David Howells
2007-11-11 2:14 ` Andrew Morton
2007-11-12 15:34 ` David Howells
2007-11-12 19:53 ` Andrew Morton
2007-11-12 22:50 ` SL Baur
2007-11-12 23:14 ` David Howells
2007-11-13 3:09 ` SL Baur
2007-11-13 10:57 ` David Howells
2007-11-13 11:18 ` Andrew Morton
2007-11-13 12:46 ` Peter Zijlstra
2007-11-13 20:40 ` Matt Mackall
2007-11-13 20:46 ` Peter Zijlstra
2007-11-11 11:25 ` Adrian Bunk
2007-11-11 13:59 ` David Howells
2007-11-11 14:22 ` Adrian Bunk
2007-11-11 15:03 ` David Howells
2007-11-11 15:19 ` Adrian Bunk
2007-11-11 15:46 ` Andi Kleen
2007-11-11 16:05 ` Adrian Bunk
2007-11-11 16:31 ` David Howells
2007-12-03 15:15 ` David Howells
2007-12-03 16:00 ` Ralf Baechle
2007-12-03 16:17 ` Adrian Bunk
2007-11-09 15:34 ` [PATCH 2/6] MTD: Add support for the SST 39VF1601 flash chip " David Howells
2007-11-09 22:34 ` David Woodhouse
2007-11-09 15:34 ` [PATCH 3/6] USB: net2280 can't have a function called show_registers() " David Howells
2007-11-09 15:34 ` [PATCH 4/6] MN10300: Allocate serial port UART IDs for on-chip serial ports " David Howells
2007-11-09 15:35 ` [PATCH 6/6] MN10300: Add MTD flash support for the ASB2303 board " David Howells
2007-11-10 4:05 ` David Woodhouse
2007-11-11 14:01 ` David Howells
[not found] ` <20071109153458.20803.10594.stgit@warthog.procyon.org.uk>
2007-11-10 3:53 ` [PATCH 5/6] MN10300: Add the MN10300/AM33 architecture to the kernel " Andrew Morton
2007-11-10 12:18 ` David Howells
2007-11-10 19:43 ` Andrew Morton
2007-11-10 20:02 ` Alan Cox
2007-11-11 14:32 ` David Howells
2007-11-12 7:44 ` Adrian Bunk
2007-11-10 20:09 ` Alan Cox
2007-11-11 14:48 ` David Howells
2007-11-11 15:18 ` Alan Cox
2007-11-11 16:36 ` David Howells
2007-11-11 16:42 ` Alan Cox
2007-11-12 12:19 ` David Howells [this message]
2007-11-11 15:07 ` David Howells
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