On 05/02/2016 02:54 PM, Yiannis Papelis wrote:
Very much agree with you - even though I don't want to use a battery, it
seems more and more than a battery is a necessity for field use of the
BBB, which would explain the existing connector.
In my work, the solution was to use a read-only filesystem with a tmpfs
overlay. I mount the boot and root partitions read-only, and configure
/etc/sysconfig/readonly-root with READONLY=yes and TEMPORARY_STATE=yes.
(This system runs Fedora.)
Permanent file writes are not frequently needed, but the filesystems can
be temporarily re-mounted as read/write when they are required.
Also, I use a Swissbit SD card, which is more robust (and expensive)
than normal SD cards, because it contains additional power-down protection.
I haven't experienced any filesystem corruption since switching to this
approach.
I did use supercaps as pseudo-battery-backups for a while - the program
would switch the filesystem to readonly as soon as a powerfail circuit
was tripped - but the readonly+overlay approach is simpler and more
robust in practice.
- Mike
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