Reset on Beaglebone Black has become unreliable/broken

[Konstantin Kletschke]

Today tried the following for debugging purposes:

In am33xx_generic.c in arch/arm/mach-omap there is in
am33xx_restart_soc() this:

writel(AM33XX_PRM_RSTCTRL_RESET, AM33XX_PRM_RSTCTRL);

which is 0x1 written to 0x44e00f00 and causes warm restart.

I can simulate this with "mw 0x44e00f00 0x1" which shows the freeze 
I see (upon restart) on affected BBBs.

When I change the value to 0x2 (cold restart) the affected BBBs restart
successfully!

Does this ring a bell for people more experiened? This is not meant as a
proposed solution (Watchdog restart, Linux Kernel restart no covered,
reset cause deleted/hidden(?)), more is it meant as an idea to find the
cause. Poweron, cold restart working always100%, warm restart never.

Regards
Konstantin

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