On Mon, 13 Oct 2014 12:14:40 +0200 Udo van den Heuvel <[email protected]> wrote:
> On 2014-10-12 19:42, Peter Hurley wrote: > > On 10/12/2014 09:57 AM, Udo van den Heuvel wrote: > >> The problem: > >> During the first few seconds of bootup the kernel gets into some sort of > >> loop and rapidly prints loads of register-like things and then a load of > >> rubbish. > >> I did `make clean` and then a rebuild etc but this did not help. > >> > >> How can I capture the logging to find the point where things go wrong? > >> How can I find out what is wrong? > > > > Start with git bisect between good=3.16.2 and bad=3.16.3. > > And dmesg from 3.16.2. > > Incomplete dmesg attached for 3.16.2. > > > What happens after the 'then a load of rubbish.'? > > I press reset as this is unexpected and looks like it will not result in > a succesfull boot. > > > And rubbish is not > very descriptive. Please include a sample, if you can't catch all the > console prints. > > How can I capture the output easily? Add "boot_delay=3000" to the kernel command line. This will add a 3 second delay between each line. Then take pictures of the screen while it boots. And try to time the shots so you take them during the delays. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
