[vcf-midatlantic] TVs installed!

David Riley fraveydank at gmail.com
Mon Oct 24 12:41:27 EDT 2016

On Oct 24, 2016, at 11:51 AM, Neil Cherry via vcf-midatlantic <vcf-midatlantic at 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

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