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

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Date:	Tue, 20 Nov 2012 16:16:38 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Kyungmin Park <kmpark@...radead.org>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux@....linux.org.uk, linus.walleij@...ricsson.com,
	jonas.aberg@...ricsson.com, will.deacon@....com, arnd@...db.de,
	Mian Yousaf Kaukab <mian.yousaf.kaukab@...ricsson.com>
Subject: Re: [PATCH 1/2] Boottime: A tool for automatic measurement of
 kernel/bootloader boot time

> > > +/* 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. ;)

Okay, so I'm going through the motions of upstreaming this magic
now. Please see the link below for reference:

http://marc.info/?l=u-boot&m=135342273317337&w=2

-- 
Lee Jones
Linaro ST-Ericsson Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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