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Address Mapping
- To: Mailing List Recipients <pci-sig-request@znyx.com>
- Subject: Address Mapping
- From: pavel.peleska@oen.siemens.de
- Date: 28 JAN 97 11:51:51 MEZ
- Resent-Date: 28 JAN 97 11:51:51 MEZ
- Resent-From: pci-sig-request@znyx.com
- Resent-Message-Id: <"EgXsL.0.5D2.CtTxo"@dart>
- Resent-Sender: pci-sig-request@znyx.com
Dear PCIers,
we build a Pentium embedded system with the system (memory) address mapped
1:1 to the pci address space. However the CPU can access the PCI Bus only
within a 128 MB window in the third giga byte address range. We will be
using peripherial controllers via PCI. All controllers that we have seen so
far can map their registers anywhere in the 32 bit address space - so far
so good. However the PCI Spec. defines a BAR type bit(2:1)=01 where the
address has to be located below 1 MB.
Which devices use this type of BAR? Can controllers with this type of BAR
be relevant in an embedded system (without PC operating system)?
Are there any systems which use different address mapping schemes that 1:1
(System address:PCI address)?
Any comments appreciated,
Pavel Peleska Tel: ++49-89-722-41253
Siemens AG Fax: ++49-89-722-28502
SN EBG1 Email: Pavel.Peleska@mch.scn.de
Hofmannstr. 51
81359 Munich
Germany
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