Re: [9fans] pm in the bitsy

[F.J.Ballesteros <nemo@gsyc.escet.urjc.es>]

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I only took a quick look, so this could be wrong; but I think that
rs232, lcd, audio, and of course sa1100 are doing a power off and have
the code to get back on. Perhaps the pcmcia/wavelan will not do so (I
didn't check that yet).

Regarding the power-on entry point, my boot loader is already jumping
(well, not sure yet, but looks like), to the address kept in
powerregs->pspr.  The linux code was kind of a tutorial here.

So, if I'm not so mistaken, I think I'd only need to save all the
processor state and write an assembly routine to reload it (placing its
address into powerregs->pspr in sa1100_power_off).

My only problem is that I'm learning arm assembler while trying to get
this working, so I'm not too optimistic regarding the final result.

In any case, if you still think I'm missing something (well, probably
many things) and you have a minute to let me know, that would be great.

thanks for your mail


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We haven't finished writing the code to suspend/resume the bitsy yet.
We still have to add the code to all the drivers that will make them power off
the piece of hardware they control and power that back on after resume.
Then we need to write the code that turns off memory and turns it back on
after resume and, finally, we need to write the code that deals with the
power-on entry point.  We have done none of this so I'm not surprised you
have problems.

	Sape


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From: F.J.Ballesteros <nemo@gsyc.escet.urjc.es>
To: 9fans@cse.psu.edu
Subject: [9fans] pm in the bitsy
Date: Fri, 1 Jun 2001 16:53:15 +0200
Message-ID: <20010601144450.A35CC19A27@mail.cse.psu.edu>

Hi,

	I think I managed to get it suspended using the
code #undefined in power.c. 
	My only problem is that my ignorance regarding the bitsy
doesn't let me know how to make it resume. It seems that the processor
is no longer waking up (I must power cycle it); that's despite
one line that seems to prepare the on/off button to interrupt the
processor and wake it up again. Any hint, pointer,
or direction? 

thanks