Re: Fail to use ste driver on sparc64 arch

Le mardi 10 mars 2009 C  10:24 +0000, Stuart Henderson a C)crit :

> I would look through a driver which was already converted and see what
> was done. vr(4) doesn't look to be a bad choice, since it was done in
> stages, so there are small commits you can look at (look at jason@'s
> commits in October 2003)..
>
> http://www.openbsd.org/cgi-bin/cvsweb/src/sys/dev/pci/if_vr.c
>
> It will be easier to do this with the card in an i386 box so you can
> test things in stages.

thanks for your help !
I had a look on manpages for bus_dma and I think I understood the basic
idea :

1) actually, ste driver do direct I/O by reserving memory buffers (I
don't really understand why it needs a virtual to physical translation
but I guess it's not a real problem)

2) I need to replace these direct I/O access by DMA accesses using the
bus_dma API.
In particular, ste_newbuf must be rewritten, then every accesses using
actually the memory pointer returned by vtophy have to be adapted using
bus_dma* function.

Am I right ?

--
Eric Belhomme

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