base-hw ,,, What is CACHE_LINE_SIZE_LOG2?

Bob Stewart robjsstewart at ...196...
Mon Nov 18 17:00:28 CET 2013

I dont see anything about trustzone extension or secuitry mode.I suspect it 
does not, but I'll check with the community.



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On November 18, 2013 10:31:36 AM Martin Stein 
<martin.stein at ...1...> wrote:
> On 18.11.2013 16:22, bob wrote:
> > However, setting the SECURITY_EXTENSION to 1 did produce an interesting 
> result, in that the kernel crashed with an "undefined instruction" message. 
> I traced this down to a call to the Security Control register, specifically 
> to the assembly code for the read which is "asm volatile ("mrc p15, 0, 
> %[v], c1, c1, 0" : [v]"=r"(v) ::);". This is used in the method to get the 
> security mode setting in the cpu object.According to the Armv7-A 
> Architecture Reference Manual, the assembly code appears to be correct. I'm 
> not sure how to interpret that. Does it mean that the Security control is 
> just not implemented?
> This suggests that your board doesn't implement the ARM trustzone
> extension and thus not provide the co-processor #15 register c1.c1.0.
> Does the board spec say anything about trustzone or secure/non-secure mode?
> Martin
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