Re: [PATCH][RFC] sh: suspend interpreter V1

[Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>]

On 19:39 Fri 17 Apr     , Magnus Damm wrote:
> Hi Francesco,
> 
> On Fri, Apr 17, 2009 at 3:44 PM, Francesco VIRLINZI
> <francesco.virlinzi@st.com> wrote:
> > I just completed something similar on our ST40 (with PMB enabled).
> > We put the DRAM in self refresh an after that we totally turn-off the SOC
> > removing the power.
> > An external little micro has to detect the wakeup event and has to turn-on
> > the SOC.
> > The bootloader "understands" linux is frozen in memory and jump directly on
> > linux.
> >
> > Internally we call that "hibernation on memory" and clearly it needs update
> > in both linux/bootloader...
> > But from the device driver point of view this is a normal hibernation while
> > for the main core this is a special 'boot'.
> 
> Sounds a bit similar to U-standby mode on SuperH Mobile.
> 
> > Currently as major change I did are in the TMU/PMB and some asm code to
> > manage the "reboot".
> >
> > Do you think there is something shareable?
> 
> For boot loader, do you use upstream U-boot? That would be interesting to see.
no old u-boot version 1.3.1 with a diferrent implemntation as the actual SH4
Mainline support

Actually it will be nice to have it, I've this exact hardware design and wish
to do it we on a 7105.

Francesco do you have any patch or tree were we can take a look on it?

Best Regards,
J.