On Tue, Dec 03, 2024 at 07:46:56PM +0100, Ahmad Fatoum wrote: > > I can simulate this with "mw 0x44e00f00 0x1" which shows the freeze > > I see (upon restart) on affected BBBs. > > This happens without Linux first starting, right? So that invalidates > my theory of Linux reconfiguring the PMIC to something invalid. Yesthis is all reproducible without linux being involved. Applies to S1 connected to NRESET_INOUT (warm restart) and barebox too (reste cmd, watchdog triggering). > Nice. Do you know about https://barebox.org/doc/latest/user/system-reset.html ? > > TL;DR: Cold reset is usually the preferred way to reset as it comes > with the least amount of surprises. No, not yet. I will investigate. One could change this for BBB, but the ugly part is, the Hardware on the BBB forreset, S1, triggers warm restart. Hardwired, if I read correct. > What does a cold reset do on an electrical level? Does it tell the PMIC > to do a reset? I am not shure, I will investigate. There is a circle CPU PMIC_PWR_EN connected to PMIC and PMIC WAKEUP connected to CPU. PMIC's reset input is not connected. > Anther thing, I wonder about is what configuration the PMIC has on affected > boards and boards not affected. Can you use the I2C commands in barebox > to read the PMIC register set and compare it between the affected and > unaffected boards? Maybe they have different mask defaults? This is a good idea, I will do this tomorrow. Have to get used to read that out of the PMIC. May be a difference to u-boot is from interest in a second step too, but the idea about differen mask defaults is interesting since the error is so darn hitting 100% on affected boards and 0% on not affected ones. Could it be different RAM chips, whichsettings causes them to be on the edge? Regards Konsti -- INSIDE M2M GmbH Konstantin Kletschke Berenbosteler Straße 76 B 30823 Garbsen Telefon: +49 (0) 5137 90950136 Mobil: +49 (0) 151 15256238 Fax: +49 (0) 5137 9095010 konstantin.kletschke@xxxxxxxxxxxxx http://www.inside-m2m.de Geschäftsführung: Michael Emmert, Derek Uhlig HRB: 111204, AG Hannover
