DMA pool for embedded linux kernel

DMA pool for embedded linux kernel

[Bihari Ashwin-Q3316C]

Greetings,

We are in the middle of developing a chassis which will be using Embedded
Linux and during the course of configuration we've come across some
questions that would need to be answered to ensure that we make the right
system for current development and future deployment.

One of these things is the DMA pool that needs to be allocated for PCI
devices DMA between system memory and device memory (if present). I've been
trying to search but haven't found any document or anything that describes
what a reasonable size of memory should be. As we are configuring a custom
kernel, we'd like to know what the minimum is so that we don't run out of
DMA pages, and what a reasonable maximum would be so that we don't waste
memory.

The chassis we are building will be a telecom chassis running various
switch/routing applications. Any and all help and direction would be greatly
appreciated.

Regards,

----
Ashwin Bihari

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750FX specific patch or kernel version?

[DONG-IN KANG]

 Hello,

 I'm trying to port Linux on IBM750FX based custom board.
I've used kernel 2.4.17 for other board based on early IBM750.
Can I still use the 2.4.17? Or should I use an updated version of Linux.
Or is there any patches specific for 750FX?
I've seen a patch for 750FX's L2 cache.
Are there any more? (750FX has 8 BATs. So I think it should be taken
care....)

 Thanks,

 Dong-In


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Re: 750FX specific patch or kernel version?

[Guy M. Streeter]

I think support for the 750FX was added to the kernel in version 2.4.21.

--Guy

On Thu, 2003-10-23 at 09:43, DONG-IN KANG wrote:
>  Hello,
>
>  I'm trying to port Linux on IBM750FX based custom board.
> I've used kernel 2.4.17 for other board based on early IBM750.
> Can I still use the 2.4.17? Or should I use an updated version of Linux.
> Or is there any patches specific for 750FX?
> I've seen a patch for 750FX's L2 cache.
> Are there any more? (750FX has 8 BATs. So I think it should be taken
> care....)
>
>  Thanks,
>
>  Dong-In
>
>


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Re: 750FX specific patch or kernel version?

[Dan Kegel]

Guy M. Streeter wrote:
> I think support for the 750FX was added to the kernel in version 2.4.21.

Yes.  We're using a linuxppc_2_4_devel-20030617 patch against vanilla 2.4.21
for ppc750FX, I believe.

- Dan


--
Dan Kegel
http://www.kegel.com
http://counter.li.org/cgi-bin/runscript/display-person.cgi?user=78045


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