Tartarus changed the topic of #u-boot to: SOURCE MOVED TO https://source.denx.de/u-boot/u-boot.git / U-Boot v2025.01, v2025.04-rc3 are OUT / Merge Window is CLOSED, next branch is OPEN / Release v2025.04 is scheduled for 07 April 2025 / Channel archives at https://libera.irclog.whitequark.org/u-boot
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<shadow> uh... so I need help to understand mechanics of how the CPU frequency on StarFive JH7110 is established? more theory of operation and then also how I can test with U-Boot if some ideas I want to try are stable or not for the board I have using JH7110
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<shadow> the patch set I sent to LKML which upstreams changes from U-Boot resulted in feedback that I don't 100% understand, and I only have the most basic of troubleshooting and code skills
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<clamor> shadow: classic LKML
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<shadow> clamor: I'm open to learning. I'm a ski instructor, not a career programmer. I want to do whatever I'm capable and have time for to help along HomeAssistant adopting RISC-V as a supported architecture, as I want eventually for there to be more options on the market than x86 and ARM
<shadow> along the way is this interesting diversion of U-Boot, Linux Kernel, Debian, AlpineLinux, and (recently) Rocky Linux
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<clamor> shadow: I share and understand your pain
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<clamor> shadow: personally, the worst part of interacting with lkml is a schema, the code part reviews usually are quite useful and helpful (not without random weirdoes with their odd requests of course).
<shadow> yeah it's been good except from my point of view I'm a technician, I know very well how to test "thing works when power cord is plugged into working electrical outlet, does not work when unplugged" and I'm being asked to describe why it works
<shadow> I don't know. It just does.
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<shadow> for the CPU frequency stuff there's this ask for 1.5GHz (which needs increased voltage) and I've observed it causes overheating when you effectively overclock the thing
<shadow> okay so then, some mention of a divider, I'm not even sure what that is exactly
<clamor> shadow: the best way to learn how particular arch works is usually to read trm for it. That should give you some understanding how stuff works.
<clamor> div2 throttling on overheating in a passive cooled system?
<shadow> something like this. The AXP15060 PMIC allegedly provides 0.9Vdc from power on unless given some other configuration, and the JH7110 CPU (from ... I don't know how) somehow is default to 1.0GHz if you don't configure ... something(!?) ; and according to StarFive people the JH7110 is stable at 0.8Vdc+ for 1.0GHz (and lesser) div1; for div1 1.5GHz it needs a bump to 1.04Vdc to be stable
<clamor> You need trm
<shadow> the posture from StarFive people is that 1.5GHz is golden and we should keep that for Linux and (by extension because of OF_UPSTREAM effort I'm trying to sync up with my series) that U-Boot should also run this thing at 1.5GHz
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<clamor> 1.5ghz in uboot seems excessive
<shadow> yes.
<shadow> the other way I'm thinking of this having no experience or technical background in PLL's and such is that the TRM says the thing should possibly be able to be set with a root frequency of 3.0GHz ... so ... what about power on, set div3 to make me happy, then change root frequency to 3.0GHz and denylist div1
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<shadow> I just don't know how to test it and save people the bother of some dummy like me asking about it if it will be a failure
<clamor> Don't bother about that. It is better to ask then not to
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<clamor> Always ask for an explicit description of what exactly the maintainer wants from you since if you do not fully understand what you should do, you will have even more trouble and rage towards your efforts
<shadow> thanks
<shadow> I wish there was more expertise I could bring to the discussion
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<clamor> shadow: it will come with time
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<clamor> Are linux maintainers here, particularly video/drm and power supply/extcon?
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<Forty-Bot> clamor: try asking on #dri-devel on oftc
<clamor> Forty-Bot: thanks for an advice
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