Syslinux - Aug 2010 - Accessing memory PCI config space from a com32 module

I need to do PCIe memory mapped configuration space access from a com32 module.
(ECAM, memory mapped, not CAM, which uses I/O port access).

I know how to find the base address to the config space in Linux and use ECAM to
access configuration registers.

com32/lib/pci does not use ECAM.

In Linux the region for ECAM is referred to as PCI MMCONFIG. (often shows up as
e0000000-efffffff, see /proc/iomem)

Any ideas as to how to get the ECAM base address from a COM32 module?

Sincerely,
Dwight Schauer

Software Engineer
Consumer & Computing Interface
Texas Instruments Incorporated

Email: dschauer at ti.com
Phone: (214) 567-5695
Mobile: (903) 806-5737

Op 20100805 om 14:38 schreef Schauer, Dwight:
>
> I need to do PCIe memory mapped configuration space access from a com32
> module. (ECAM, memory mapped, not CAM, which uses I/O port access).
>
> I know how to find the base address to the config space in Linux and
> use ECAM to access configuration registers.
>
> com32/lib/pci does not use ECAM.
>
> In Linux the region for ECAM is referred to as PCI MMCONFIG. (often
> shows up as e0000000-efffffff, see /proc/iomem)
>
> Any ideas as to how to get the ECAM base address from a COM32 module?

FWIW
 When I saw 'PCI' and 'COM32' did came "lua.c32" to
mind.


hth
GSt

On 08/05/2010 12:38 PM, Schauer, Dwight wrote:
> 
> I need to do PCIe memory mapped configuration space access from a com32
module. (ECAM, memory mapped, not CAM, which uses I/O port access).
> 
> I know how to find the base address to the config space in Linux and use
ECAM to access configuration registers.
> 
> com32/lib/pci does not use ECAM.
> 
> In Linux the region for ECAM is referred to as PCI MMCONFIG. (often shows
up as e0000000-efffffff, see /proc/iomem)
> 
> Any ideas as to how to get the ECAM base address from a COM32 module?
> 
The only proper way you can find the MMCONFIG base address is to search
the ACPI tables for an MCFG table -- see the PCI Firmware Specification.
 You can look in com32/sysdump for code that enumerates the ACPI tables.

	-hpa