suspend/resume (Xilinx V4)

Grant Likely grant.likely at
Fri Aug 3 10:53:04 EST 2007

On 8/2/07, John Williams <jwilliams at> wrote:
> Hi,
> Any comments on the status/feasibility of suspend/resume for LinuxPPC on
> Xilinx devices?

Pretty much non-existant as far as status goes.  Feasibility depends
entirely on what power management features the Xilinx silicon
supports.  I haven't looked into whether or not the 405 core can be
put into sleep states.

> The only suspend-related traffic I see here in the last 12 months is for
> the lite5200b board.
> Any guesstimates of level of difficulty for such a task on Xilinx
> PPC405?  The core lite5200b patchset didn't look too hairy (just a
> modest bit of ASM :), but there would also be Xilinx device driver hooks
> to consider.

I suspect the driver code will be where most of the effort lies.

> Also, are there kernel revision dependencies here?  Project is currently
> on an MVL 2.6.10 tree - but have seen mention of 2.6.17 (?) being
> earliest with PPC suspend/resume capability.

Suspend support for ppc has existed for a long time, but there aren't
many embedded ppc boards which support it (5200 being a notable

Personally, I'm keeping up to date with mainline (2.6.22+) on my Virtex tree.


Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
grant.likely at
(403) 399-0195

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