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

["Pali Rohár" <pali.rohar@gmail.com>]

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On Sunday 08 December 2013 00:22:06 Tony Lindgren wrote:
> * 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

Joel Fernandes, you are author of omap-des driver. Do you know 
something about crashing kernel when omap crypto support (via L3 
firewall) is not enabled by bootloader? Do you know something 
about runtime detection of crypto support to prevent kernel/board 
crash?

Problem with kernel log of omap-aes is reported there:
http://thread.gmane.org/gmane.linux.ports.arm.omap/108397/

-- 
Pali Rohár
pali.rohar@gmail.com

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