On Oct 24, 2016, at 11:51 AM, Neil Cherry via vcf-midatlantic <vcf-midatlantic@lists.vintagecomputerfederation.org> wrote:
It's not safe to power off without a shutdown on the RPi, if the TV's usb port shuts off, just as with any Linux system. People do it anyway, when they unplug the adapter on the RPi, but they are just lucky till their SD card get scrogged Dan
Dan it can be done, if we can setup the SD read only, turn off swap and any application that write to the SD (such as syslog). When we need to write the SD (for configuration) we can remount the SD as write.
Yes, this is the correct way to do it. I do it all the time for things like routers. It's considerably easier to do on something like OpenBSD than on modern Linux (because most modern Linux distributions like to have a lot of different read/write directories for systemd and the like), but it's still pretty doable with tmpfs overlays and periodic syncs to flash (just use a journaled filesystem and hope you're not syncing when the power goes out). Updating the content is then another matter, but I highly recommend NFS for that purpose (rather than trying to swap out physical media). Connect your signage via Ethernet if you know what's good for you. - Dave