[Ovmsdev] SPIFFS or FAT for /store

[Mark Webb-Johnson]

OK, I looked into this is more detail…

Notes

Presently, spiffs does not support directories. It produces a flat structure. If SPIFFS is mounted under /spiffs creating a file with path /spiffs/tmp/myfile.txt will create a file called /tmp/myfile.txt in SPIFFS, instead of myfile.txt under directory /spiffs/tmp.
It is not a realtime stack. One write operation might last much longer than another.
Presently, it does not detect or handle bad blocks.
Maybe not… It seems that for our use-case, the wear levelled FAT maybe more suitable.

Mark

> On 19 Jan 2018, at 11:23 AM, Greg D. <gregd2350 at gmail.com> wrote:
> 
> Assuming the new file system is stable, we should move to it.  Remind
> me the syntax for scp...  we're using v1, right?
> 
> Just warn us when the change is checked in...
> 
> Greg
> 
> 
> Mark Webb-Johnson wrote:
>> ESP IDF 2.1 only had FAT support as a filesystem. We used this for the /store vfs mount, for config and script storage.
>> 
>> ESP IDF 3.x now has SPIFFS as an option.
>> 
>> SPIFFS is obviously more suited to embedded flash.
>> 
>> What do people think about making the switch to SPIFFS for /store now?
>> 
>> Doing so would probably not be hard (just a few lines of code change in the mounting of that /store partition), but would lose all config and script data in that partition (developers would have to disable vfs protection in menuconfig, then scp out first, to backup).
>> 
>> Doing it later is not really an option.
>> 
>> Thoughts?
>> 
>> Mark
>> 
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> 
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