Re: [linux-sunxi] Kernel crash in "cpu_freq"
Hi Samuel, thanks for the additional hints. Will try to follow (this is the first time I am poking around in a unix kernel since 4.3bsd ... so I'm a bit rusty still). The power supply is suitably stable. I will try and experiment with lower voltages and see what happens. I may run into questions and would appreciate your further support in case I need it. cheers Torsten sam...@sholland.org schrieb am Mittwoch, 20. Juli 2022 um 05:24:27 UTC+2: > Hi Torsten, > > On 7/19/22 3:44 AM, Torsten Beyer wrote: > > fantastic - I have built a kernel with changed setting yesterday > afternoon > > (increased min OPP to 1.1V) and the system has been running for about > 20hrs now > > without freezes. Thanks for your help - looks like this patch fixes it. > > Thanks for the confirmation. The voltage regulator supplying the CPU > (reg_dcdc2) > has a 25 mV step size, so you could see if a smaller change to the OPP is > enough > to make the board stable. > > I assume you are powering the board with a reasonably stable power supply? > In > that case, it would be good to apply your change upstream, in case any > other > Cubieboard 2 users are experiencing crashes. If you want to submit a > patch, I > would suggest overriding the OPP table in the board-specific DTS. See > here[1] > for an example of a board that does this. > > Regards, > Samuel > > [1]: > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm/boot/dts/sun7i-a20-bananapi.dts#n105 > -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/linux-sunxi/5d16187c-ea62-4c49-9668-3a86ee6eee12n%40googlegroups.com.
Re: [linux-sunxi] Kernel crash in "cpu_freq"
Hi Torsten, On 7/19/22 3:44 AM, Torsten Beyer wrote: > fantastic - I have built a kernel with changed setting yesterday afternoon > (increased min OPP to 1.1V) and the system has been running for about 20hrs > now > without freezes. Thanks for your help - looks like this patch fixes it. Thanks for the confirmation. The voltage regulator supplying the CPU (reg_dcdc2) has a 25 mV step size, so you could see if a smaller change to the OPP is enough to make the board stable. I assume you are powering the board with a reasonably stable power supply? In that case, it would be good to apply your change upstream, in case any other Cubieboard 2 users are experiencing crashes. If you want to submit a patch, I would suggest overriding the OPP table in the board-specific DTS. See here[1] for an example of a board that does this. Regards, Samuel [1]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm/boot/dts/sun7i-a20-bananapi.dts#n105 -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/linux-sunxi/dc03b197-492a-0979-728b-61d9135cb7d1%40sholland.org.
Re: [linux-sunxi] Kernel crash in "cpu_freq"
Hi Samuel, fantastic - I have built a kernel with changed setting yesterday afternoon (increased min OPP to 1.1V) and the system has been running for about 20hrs now without freezes. Thanks for your help - looks like this patch fixes it. cheers Torsten sam...@sholland.org schrieb am Dienstag, 19. Juli 2022 um 04:13:48 UTC+2: > Hi Torsten, > > On 7/18/22 7:13 AM, Torsten Beyer wrote: > > Hi again, > > > > I believe I found the place. Can you confirm that changing the > microvolts OPPs > > in "arch/arm/boot/dts/sun7i-a20.dtsi" is the right place for upping the > > microvolts for lower frequencies? > > Yes, in that file, in the operating-points property of the cpu nodes. > > Regards, > Samuel > -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/linux-sunxi/9a4a3380-8e54-494c-9bce-daa33a70ac0cn%40googlegroups.com.
