From: Adrian Cox <apc@agelectronics.co.uk>
To: Andrew_Klosterman@3com.com
Cc: linuxppc-dev@lists.linuxppc.org
Subject: Re: What is being setup in chrp_setup_pci_ptrs()?
Date: Tue, 10 Aug 1999 09:41:24 +0100 [thread overview]
Message-ID: <37AFE5B4.A8599342@agelectronics.co.uk> (raw)
In-Reply-To: 882567C9.000F1D9D.00@hqoutbound.ops.3com.com
Andrew_Klosterman@3com.com wrote:
> In the function chrp_setup_pci_ptrs() at the end of the file
> /arch/ppc/kernel/chrp_pci.c there are three different variables that are
> initialized depending on the system being used:
> pci_dram_offset,
The PCI address of physical memory address 0 (which should also be
kernel virtual address 0xc0000000). If physical memory does not start at
0, then things are a bit more complicated.
> isa_mem_base and
The kernel virtual address to which you have mapped ISA memory space.
You may need this for the ROMs on ISA cards.
> isa_io_base.
The kernel virtual address to which you have mapped IO space. This is
used by insb and similar instructions.
For more details of these, read include/asm-ppc/io.h
- Adrian Cox, AG Electronics
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prev parent reply other threads:[~1999-08-10 8:41 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-08-10 2:45 What is being setup in chrp_setup_pci_ptrs()? Andrew_Klosterman
1999-08-10 8:17 ` Geert Uytterhoeven
1999-08-10 8:41 ` Adrian Cox [this message]
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