Hi Lee,
On Mon, Nov 26, 2012 at 1:00 AM, Lee Jones lee.jones@linaro.org wrote:
Hi Simon,
On Tue, Nov 20, 2012 at 6:33 AM, Lee Jones lee.jones@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@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.
Wolfgang, didn't you know about bootstage? This could have saved us a great deal of time.
Kind regards, Lee
-- Lee Jones Linaro ST-Ericsson Landing Team Lead Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog
Regards, Simon