From: arnd@arndb•de (Arnd Bergmann)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH 1/2] Boottime: A tool for automatic measurement of kernel/bootloader boot time
Date: Thu, 15 Nov 2012 12:25:30 +0000 [thread overview]
Message-ID: <201211151225.31066.arnd@arndb.de> (raw)
In-Reply-To: <20121115112543.GC21682@gmail.com>
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
next prev parent reply other threads:[~2012-11-15 12:25 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-15 10:04 [PATCH 0/2] Boottime: measure bootloader and kernel bootup time Lee Jones
2012-11-15 10:04 ` [PATCH 1/2] Boottime: A tool for automatic measurement of kernel/bootloader boot time Lee Jones
2012-11-15 10:16 ` Kyungmin Park
2012-11-15 11:25 ` Lee Jones
2012-11-15 12:25 ` Arnd Bergmann [this message]
2012-11-15 17:31 ` Linus Walleij
2012-11-20 16:16 ` Lee Jones
2012-11-29 20:35 ` Simon Glass
2012-11-30 8:21 ` Lee Jones
2012-11-15 13:52 ` Andrew Murray
2012-11-15 14:37 ` Lee Jones
2012-11-15 10:04 ` [PATCH 2/2] clocksource: clksrc-dbx500-prcmu: Add boottime support Lee Jones
2012-11-15 10:15 ` [PATCH 0/2] Boottime: measure bootloader and kernel bootup time Jean-Christophe PLAGNIOL-VILLARD
2012-11-15 10:35 ` Lee Jones
2012-11-15 10:57 ` Jean-Christophe PLAGNIOL-VILLARD
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