# R15 Legato\_21 and Talon Wifi IOT card

**URL:** https://forum.legato.io/t/r15-legato-21-and-talon-wifi-iot-card/6404
**Category:** Uncategorized
**Created:** [January 20, 2023, 5:30am UTC](https://forum.legato.io/t/r15-legato-21-and-talon-wifi-iot-card/6404 "2023-01-20T05:30:22Z")
**Posts on this page:** 1
**Showing post:** 6

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### Author: ![jyijyi](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/jyijyi/32/822_2.png) [@jyijyi](https://forum.legato.io/u/jyijyi)
#### Post date: [January 20, 2023, 6:36am UTC](https://forum.legato.io/t/r15-legato-21-and-talon-wifi-iot-card/6404/6 "2023-01-20T06:36:31Z")

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Here is an example to overlay on read only file system.

> [@Create folders inside /mnt (w/o editing sierra\_git.bb)](https://forum.legato.io/t/create-folders-inside-mnt-w-o-editing-sierra-git-bb/5203/4):
>
> I remember i can overlay on read only file system. For example, mkdir /tmp/tmp\_usr\_lib;mkdir /tmp/tmp\_usr\_lib\_wr; mount -t overlay overlay /usr/lib -o lowerdir=/usr/lib,upperdir=/tmp/tmp\_usr\_lib,workdir=/tmp/tmp\_usr\_lib\_wr; Not sure if you can do the same.

Of course you can also rebuild the yocto image

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