Re: runtime check for omap-aes bus access permission (was: Re: 3.13-rc3 (commit 7ce93f3) breaks Nokia N900 DT boot)

[Tony Lindgren <tony@atomide.com>]

* Sebastian Reichel <sre@ring0.de> [131207 15:04]:
> On Sat, Dec 07, 2013 at 01:11:37PM -0800, Tony Lindgren wrote:
> > > I asked Pali to send me his copy of the updated NOLO bootloader,
> > > so that I can test this. I just checked the omap documentation
> > > (I only have access to the public one) and crypto related stuff
> > > is not documented for the L3_PM_READ_PERMISSION register. There
> > > are a couple of reserved bits, which may be used for this, though.
> > > 
> > > I also CC'd Joel Fernandes, since he worked on the driver before and
> > > may have access to the documentation.
> > 
> > Looks like at least the 36xx public version referenced here has them:
> > 
> > http://www.spinics.net/lists/linux-omap/msg21857.html
> > 
> > I'd assume the registers are the same for 34xx since we don't have
> > them defined separately in the kernel.
> 
> I can't find it in the omap36xx documentation either. Maybe I search
> at the wrong position. I tried to find something crypto related in
> 
> Table 9-89. L3_PM_READ_PERMISSION_i

Hmm maybe it's done based on the address in L3_PM_ADDR_MATCH_k?

I guess the thing to do would be to compare the register output between
the two different firmware versions.

Regards,

Tony