Hello Konstantin, On 07.01.25 14:12, Konstantin Kletschke wrote: > On Tue, Jan 07, 2025 at 12:17:03PM +0100, Ahmad Fatoum wrote: > Should add a delay of 1.8ms. Is this feasible? Sounds ok to me. Please send a patch to that effect with an explanatory comment, summarizing what hardware was observed to have what issues. >> If it's indeed just a millisecond, I am in favor of adding this to >> barebox upstream with a comment explaining what this fixes, even >> if we don't fully understand it yet. > > Yes, I agree to the not fully yet understood part. > What me holds back from lowering the speed is the following: > > I went into production with the final result part above and reflashe all > our BBB devices which failed warm start without the additional delay and > all passed 100% flawlessly after the modficication. So it is tested upon > roughly 30 devices which failed before. I am surprised you are still shipping new products with a Beaglebone Black, but anyhow, we need to be pragmatic and a ~2ms delay, even if not completely understood is an acceptable price to pay for barebox reliably starting up on newly produced BBBs. Cheers, Ahmad > > Kind Regards > Konstantin > > > -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
