> > > Most hardware + firmware combinations provide insufficient detail > > > to know what pins are used for what, reserved for what, or wired > > > to an auto-destruct. > > > > But that's by design. GPIO is simply an interface to a digital I/O pin = > > on the CPU. Everything after that is up to the end-user. > > That is not true. > > OpenBSD has no clue what it is wired to. Except on a lot of machines, > some pin has been wired to something on the board itself. >
So it was, kernel being clueless, before FDT became mandatory, no? I'd guess we're more likely to run into a u-boot build in the future not providing safe voltages or such on some not-yet-existing board, that might really fry things given OpenBSD has no clue about adjusting the voltages nor input to sensors it could support. -Artturi > > Especially so since they are the ones controlling what is connected > > to those pins. > > That is not true. > > I have an armv7 machine here. It has no pins on the outside. It has > a pile of gpio devices. > > Are they all wired to nothing?? No, some of them are wired to things, > I can promise you that. > > > I bit-bang the RPI all the time, and no two of them ever uses the = > > available pins in the same way. > > That's nice. The RPI is one machine, out of a growing catagory of > machines numbering a 100+ > > Many of those machines wire pins pins to internal things. When they > do that, OpenBSD does not know. It depends on someone reading the > manual. > > Really, I suggest you go read the start of the thread.
