[U-Boot] [PATCH 3/8] boottime: Add core boottime measurement support

[Lee Jones]

Hi Simon,

> >> On Tue, Nov 20, 2012 at 6:33 AM, Lee Jones <lee.jones at linaro.org> wrote:
> >> > Boottime is a tool which can be used for full system booting time
> >> > measurement. Bootloader boot time is passed to the kernel component
> >> > though ATAGS. The kernel-side driver then uses this information to
> >> > provide full system boot time diagnostics though debugfs.
> >> >
> >> > Based heavily on the original driver by Jonas Aaberg.
> >> >
> >> > Signed-off-by: Lee Jones <lee.jones at linaro.org>
> >>
> >> Did you take a look at bootstage, which seems at least on the surface
> >> to provide a similar mechanism? This passes the information to the
> >> kernel through a device tree, or worse case a 'stash area'.
> >
> > I didn't see this before.
> >
> > I don't see the kernel counterpart, did it make it upstream?
> 
> It was sent upstream, just for a feeler, but before U-Boot support was
> mainlined and before we had a way to deal with the non-fdt case. That
> is now implemented and in mainline, although it has not yet gone out
> in a release (should be Jan 2013). So I was planning to address that
> again in the kernel at some point.

Well if this does the same job as the boottime implementation, I'll
scrap my efforts to upstream it.

By the way, if Wolfgang didn't want these tracepoints in DT, then
how was your implementations upstreamed into u-boot?

Kind regards,
Lee

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