Subject: [PATCH 1/2] Boottime: A tool for automatic measurement of kernel/bootloader boot time

From: [email-masked] (Arnd Bergmann)
Date: Thu, 15 Nov 2012 12:25:30 +0000

On Thursday 15 November 2012, Lee Jones wrote:
> 
> > > +/* for automatic boot timing testcases */
> > > +#define ATAG_BOOTTIME  0x41000403
> > Where can I refer this ATAG usage? can you point out the reference URL
> > or patches?
> 
> I assumed this would be in Mainline u-boot, but apparently not.
> On closer inspection of the internal ST-Ericsson u-boot, this
> functionality appears to be provided by patches which currently
> exist as delta. So in essence, the bootloader you use will have
> to be patched in a similar way for you to retrieve information
> surrounding bootloader boot times.
> 
> And there was me thinking it was magic. ;)
> 

And since we're moving away from ATAG on ux500 towards DT, it won't
even work in the future. How essential is this part for the operation
of your code?

	Arnd