[LinuxBIOS] pci base registers

[Rogelio Serrano]

does linuxbios use the acpi tables to figure out where to find the pci
base registers?

and how are the dram config registers accessed in epia-m? is it
directly or via pci host bridge configuration registers?

[Richard Smith]

On 8/23/06, Rogelio Serrano  wrote:
> does linuxbios use the acpi tables to figure out where to find the pci
> base registers?

No.  acpi tables are subject to copyright from the mfg and might be
restricted on distribution.
> and how are the dram config registers accessed in epia-m? is it
> directly or via pci host bridge configuration registers?

I'm not sure I understand what you are asking.  Can you point me to
the code that you are asking about?

[Rogelio Serrano]

On 8/24/06, Richard Smith  wrote:
> On 8/23/06, Rogelio Serrano  wrote:
> > does linuxbios use the acpi tables to figure out where to find the pci
> > base registers?
>
> No.  acpi tables are subject to copyright from the mfg and might be
> restricted on distribution.
> > and how are the dram config registers accessed in epia-m? is it
> > directly or via pci host bridge configuration registers?
>
> I'm not sure I understand what you are asking.  Can you point me to
> the code that you are asking about?

im really confused where dram configuration is being done in the
epia-m. is it in raminit.c? I thought we cannot use c code until dram
is set up.

i resorted to reading the acpi and amd bios manuals and got even more confused.

[Richard Smith]

> im really confused where dram configuration is being done in the
> epia-m. is it in raminit.c? I thought we cannot use c code until dram
> is set up.

Welcom to the most difficult part of linuxbios. :)

We can't run _normal_ C code.  But we have romcc.  romcc is a C
compiler that is designed to run without RAM.  Its uses CPU registers
only.

The raminit.c and .h code is the code you want to look at.
> i resorted to reading the acpi and amd bios manuals and got even more confused.

Yeah.  Avoid acpi if you can .

[Rogelio Serrano]

On 8/24/06, Richard Smith  wrote:
> > im really confused where dram configuration is being done in the
> > epia-m. is it in raminit.c? I thought we cannot use c code until dram
> > is set up.
>
> Welcom to the most difficult part of linuxbios. :)
>
> We can't run _normal_ C code.  But we have romcc.  romcc is a C
> compiler that is designed to run without RAM.  Its uses CPU registers
> only.
>
> The raminit.c and .h code is the code you want to look at.

I see! Thanks!

Thats really smart!
> > i resorted to reading the acpi and amd bios manuals and got even more confused.
>
> Yeah.  Avoid acpi if you can .

[Stefan Reinauer]

* Rogelio Serrano  [060823 17:54]:
> does linuxbios use the acpi tables to figure out where to find the pci
> base registers?

no. they are cfc/cf8 on all PC architectures. No need for ACPI bloat.

Stefan