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

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Date:	Fri, 30 Nov 2012 08:21:39 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Simon Glass <sjg@...omium.org>
Cc:	Kyungmin Park <kmpark@...radead.org>, linux@....linux.org.uk,
	linus.walleij@...ricsson.com, jonas.aberg@...ricsson.com,
	will.deacon@....com, linux-kernel@...r.kernel.org, arnd@...db.de,
	Mian Yousaf Kaukab <mian.yousaf.kaukab@...ricsson.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/2] Boottime: A tool for automatic measurement of
 kernel/bootloader boot time

On Thu, 29 Nov 2012, Simon Glass wrote:

> Hi,
> 
> On Tue, Nov 20, 2012 at 8:16 AM, Lee Jones <lee.jones@...aro.org> 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. ;)
> >
> > 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
> 
> Given that U-Boot has bootstage, would it make sense to upstream that
> to the kernel? Some RFC patches were sent before this went into U-Boot
> to sound out the interest.

Right. As Simon and I have already discussed, I am pulling the
u-boot and kernel boottime components in lieu of bootstage.

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