[U-Boot] [PATCH 0/7] Bootgraph.pl instrumentation support for UBoot

[Graeme Russ]

Hi Andrew,

On Thu, Sep 1, 2011 at 9:25 AM, Andrew Murray <amurray at mpc-data.co.uk> wrote:
> On 1 September 2011 00:12, Simon Glass <sjg at chromium.org> wrote:
>> Hi Mike,
>>
>> On Wed, Aug 31, 2011 at 3:47 PM, Mike Frysinger <vapier at gentoo.org> 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.
>>>>

[snip]

>>>>
>>>> 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 ?

No, your memory is fine :)

>>> -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?
>

Have a look through the mailing list archive - I find this one the easiest
for scanning headings: http://lists.denx.de/pipermail/u-boot/

Take a look over the last few months for anything timer related - Trust
me, the rabit warren is very deep ;)

When I get a chance to breath again, I'll be taking another look at the
timer API and with the (hopefully) pending inclusion of the pre-console
buffer, I think boot tracing will come together very nicely

Regards,

Graeme