From: Dan Malek <dan@embeddededge.com>
To: Jim Rowe <rowejames@acmsystems.com>
Cc: linuxppc-embedded@lists.linuxppc.org
Subject: Re: MPC8250 + PCMCIA + airo_cs card + IO Port mapping problem?
Date: Thu, 22 May 2003 00:33:51 -0400 [thread overview]
Message-ID: <3ECC532F.1080008@embeddededge.com> (raw)
In-Reply-To: 1053557921.16972.149.camel@kneedragger
Jim Rowe wrote:
>>From what I can see - and please correct me if I'm wrong, the way that
> Linux translates the Port IO to the memory mapped IO is through the outb
> and outw macros, which add an offset of _IO_BASE. How do I determine the
> correct value of _IO_BASE?
The value of _IO_BASE depends upon how you configure and map the host PCI
bridge on the 8250.
> ... I looked in m8260_setup.c and found
The 8260 doesn't have a PCI bridge, so these mappings aren't appropriate
for your board. The 0xf0000000 is needed to get to the IMMR space, but
those accesses don't (shouldn't) be using in/out macros. The 0xe0000000
space is generally used for flash prom, external devices, local sdram
and so on.
There are a variety of configuration options for the PCI bridge and all of
the other I/O in your system and the mapping using either BATs or page
tables. It depends upon the address ranges of all of the I/O in your
system and their physical space allocation.
-- Dan
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2003-05-22 4:33 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-05-21 22:58 MPC8250 + PCMCIA + airo_cs card + IO Port mapping problem? Jim Rowe
2003-05-22 4:33 ` Dan Malek [this message]
2003-05-22 19:29 ` Jim Rowe
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