MSGID: <697a97c5@news.ausics.net> 0371f769   
   REPLY: <10le18k$r92i$1@dont-email.me> 87281c1f   
   PID: PyGate 1.5.6   
   TID: PyGate/Linux 1.5.6   
   CHRS: ASCII 1   
   TZUTC: 1000   
   REPLYADDR not@telling.you.invalid   
   REPLYTO 3:633/10 UUCP   
   bp@www.zefox.net wrote:   
   > Does anybody happen to know how data travels between gpio pins   
   > 8 and 10 and the system console? In other words, what hardware   
   > and maybe software facilitate the exchange? For example, the   
   > internal ethernet adapter is connected to the CPU via USB. Is   
   > something analogous for the system console?   
      
   I know with the BCM2835 (Pi 1 and Zero) both the UARTs (serial   
   ports) are part of the SoC, as described in the peripherals   
   documentation (often called the datasheet, though it's not really).   
   They're "peripherals", but part of the chip so the signals connect   
   directly - definitely no USB interface in-between. Other RPis   
   _could_ be different but it's extremely unlikely because at least   
   one UART peripheral is pretty essential, even just during product   
   development.   
      
   > I'm seeing what look like console failures on older-model Pi2s   
   > (v1.1) and wondering if some accessory subsystem, (usb comes   
   > to mind but I don't think that's it specifically) when running   
   > FreeBSD-current.   
      
   Even though it's part of the same SoC as the CPU and other things,   
   the UART is still something that can fail or be misconfigured even   
   if there's nothing like USB in-between. Running a program/script   
   that toggles the power light on/off (or another GPIO signal that   
   you monitor) would indicate whether the CPU is still running when   
   the serial console hangs.   
      
   > The machine stops without complaint or warning, does not answer   
   > ping and has to be power cycled.   
      
   Since it doesn't respond to a ping either, that suggests that it's   
   probably crashed completely.   
      
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