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