Date: Mon, 29 Jan 2018 13:45:31 +0000 From: "Poul-Henning Kamp" <phk@phk.freebsd.dk> To: Oleksandr Tymoshenko <gonzo@bluezbox.com> Cc: Emmanuel Vadot <manu@bidouilliste.com>, Warner Losh <imp@bsdimp.com>, John Baldwin <jhb@freebsd.org>, Ravi Pokala <rpokala@mac.com>, src-committers <src-committers@freebsd.org>, svn-src-all@freebsd.org, svn-src-head@freebsd.org, owner-src-committers@freebsd.org Subject: Re: svn commit: r328257 - in head/sys: arm/broadcom/bcm2835 dts/arm modules Message-ID: <33452.1517233531@critter.freebsd.dk> In-Reply-To: <20180129132736.GA66330@bluezbox.com> References: <90451.1516663240@critter.freebsd.dk> <2987003.eeGRFBb6N8@ralph.baldwin.cx> <CANCZdfrh0NHq7cbkq_genEdzo%2BB3G4TTAcEzpgh11sr%2B82e9aw@mail.gmail.com> <93949.1516733748@critter.freebsd.dk> <20180127210801.37b8001125dd0a2c92372f98@bidouilliste.com> <72042.1517094867@critter.freebsd.dk> <8d8ae9d10058fd72ce3ec467181c9f22@megadrive.org> <13025.1517179897@critter.freebsd.dk> <20180129063950.GA59901@bluezbox.com> <32793.1517221534@critter.freebsd.dk> <20180129132736.GA66330@bluezbox.com>
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-------- In message <20180129132736.GA66330@bluezbox.com>, Oleksandr Tymoshenko writes: >> If I pick a RPI[23] out of the box, download a FreeBSD image, >> put the card in and play around, I should be able to put a >> LED in a breadboard and configure a line for PWM or attach >> an I2C or SPI device without reboot between every single >> experiment. > >No problem. We include pwm.dtbo in our snapshot and config.txt. >We have PWM running out of the box. Problem solved, no need for >any hacks. I'll gladly work with Glen and Brad to get this >functionality in snapshots/builds. You seem to have skipped the bit about "without reboot" ? >Raspberry Pi and other hobbyist ARM boards are basically Lego. >They can be turned into multiple things and that's their selling >point. They're hackers' toys. That's *exactly* why I want us to support them better. >You ignored my question: what would be authoritative source for this >kind of info? World is not perfect, FreeBSD/arm support is not perfect. >We have limited resources. Where we should apply them to guide >new contributors? At the very least have some place to point developers for a resonably up-to-date idea of what the FDT related architecture in FreeBSD is. Either documentation or source code (preferably with a bit of contextual comments) on our chosen reference platform. (Source code on ref-platform is probably more robust, as there is a better chance that it will be kept current.) >You also ignored my question about clkman fix. Provided you have >all the documentation you need [...] I don't. The information for the PWM case was based on an affine transform of information for the GPIO clock some shrewed guesses and finally in-lab measurement of what actually transpired when I frobbed registers. But more importantly, I have no idea what servies *a* clock manager offers, through which apis and to what clients and at what level of abstraction and flexibility ? -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.
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