8260, FCC and local bus

8260, FCC and local bus

[Matt Gessner]

Hello list,

Has anyone done anything with mapping local bus memory
so that it can be used for FCC BD's and buffers?

I **thought** I had it right, but my driver eventually
causes the machine to hang (EST SBC8260).

I had ioremap'd it, and put va's and pa's where each belonged
(va's for the kernel's tracking stuff and pa's for the CPM stuff).

Alas, to no avail.

Has anyone had any success with this, and if so, would you be
willing to share?

TIA,

--
Matt Gessner, mattg@aiinet.com--NOSPAM
Senior Software Engineer, R&D
Applied Innovation, Inc.
614-798-2000

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Re: 8260, FCC and local bus

[Matt Gessner]

Matt Gessner wrote:
>
> Hello list,
>
> Has anyone done anything with mapping local bus memory
> so that it can be used for FCC BD's and buffers?
>
> I **thought** I had it right, but my driver eventually
> causes the machine to hang (EST SBC8260).
>
> I had ioremap'd it, and put va's and pa's where each belonged
> (va's for the kernel's tracking stuff and pa's for the CPM stuff).
>
> Alas, to no avail.
>
> Has anyone had any success with this, and if so, would you be
> willing to share?
>
> TIA,
>
> --
> Matt Gessner, mattg@aiinet.com--NOSPAM
> Senior Software Engineer, R&D
> Applied Innovation, Inc.
> 614-798-2000
>

Sigh.

Check RSTATE and TSTATE (for FCRx) .

Thanks anyway.
--
Matt Gessner, mattg@aiinet.com--NOSPAM
Senior Software Engineer, R&D
Applied Innovation, Inc.
614-798-2000

** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/

Re: 8260, FCC and local bus

[Dan Malek]

Matt Gessner wrote:

> I had ioremap'd it, and put va's and pa's where each belonged
> (va's for the kernel's tracking stuff and pa's for the CPM stuff).


The va/pa macros are not going to work on Local memory addresses.
You have to explicitly compute these addresses.

I have a board with some local memory.  I'll test it.



	-- Dan

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8260 FCC and local bus

[Sylvain Latulippe]

Hi all,

I have found some information in the mailing list regarding usage of local
bus ram for FCC BD's and buffers.  However I haven't found any conclusion if
it's working.

Has anyone done it successfully?
What kind of support does linux provide regarding local bus ram? (Ram
drive,...)

Thanks,

====================================================================
Sylvain Latulippe, Technical Leader/Low Level Software Designer
Mediatrix Telecom Inc.		Tel: (819) 829-8749 x257
4229 Garlock Street		Fax: (819) 829-5100
Sherbrooke (Quebec)		Web: http://www.mediatrix.com
Canada J1L 2C8			Email: mailto:slatulippe@mediatrix.com
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RE: 8260 FCC and local bus

[Allen Curtis]

> I have found some information in the mailing list regarding usage of local
> bus ram for FCC BD's and buffers.  However I haven't found any
> conclusion if
> it's working.

Yes, you can use local RAM for the BD's and buffers. There is a penalty
because you need to move the buffers between local and 60X RAM. I have found
information on the list indicating that you can use IDMA for this purpose.
(search with the keyword "profiling" in embedded)

> Has anyone done it successfully?
> What kind of support does linux provide regarding local bus ram? (Ram
> drive,...)

No real support for local RAM per say. You need to treat it as any other
memory mapped device. Therefore you need to change all _va()/_pa() calls to
ioremap() and iopa().

Note: If you are using rev-A 8260 processors, this helps a lot.


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