On 1 September 2011 00:12, Simon Glass <[email protected]> wrote: > Hi Mike, > > On Wed, Aug 31, 2011 at 3:47 PM, Mike Frysinger <[email protected]> wrote: >> On Wednesday, August 31, 2011 18:20:54 Andrew Murray wrote: >>> This patchset introduces the CONFIG_BOOT_TRACE option which provides >>> support for boot time instrumentation. >>> >>> When enabled printf output is prefixed with timing information (similar to >>> the kernel's CONFIG_PRINTK_TIME option) and additional output is generated >>> which instruments functions and commands called (much like the kernel's >>> initcall_debug functionality). >>> >>> The kernel's bootgraph.pl script has been ported to render UBoots >>> instrumented ouptut into a pretty SVG graph. An example of this can be >>> found here: http://goo.gl/dX8aR - which shows the boot time of a Beagle >>> board. >>> >>> The patch currently provides support for instrumentation of UBoot commands >>> (e.g. U_BOOT_CMD) for all platforms but only when the HUSH shell is not in >>> use. Initialisation instrumentation is only limited to the >>> arch/arm/lib/board.c file at present but can very easily be extended to >>> other relevant files. >> >> i feel like we've had similar ideas tossed around semi-recently. am i just >> misremembering ? >> -mike >> > > Yes, for example: > > http://patchwork.ozlabs.org/patch/95513/ > > It got caught up with a big discussion about whether we want a > microsecond timer. There is now one in Tegra, but not in the generic > timer API. There was also a request to unify this with the > boot_progress stuff (i.e. it turned into a big cleanup). > > I haven't got back to it yet, but could probably do something next week. > > I also have patches to pass the timings to the kernel and have it > report them to user space through a device. Planning to send an RFC to > the LKML about that probably next week as well. Could be fun. > > Regards, > Simon >
Ah - my bad. I only subscribed to the mailing list today (my first UBoot patch) and didn't notice this previous work. Is there any cross over between my approach and what is planned/already been done? Andrew Murray _______________________________________________ U-Boot mailing list [email protected] http://lists.denx.de/mailman/listinfo/u-boot
