As for the particular case of /mnt, on most images, /mnt is a symlink to /media, and /media is (on) a filesystem in RAM, so it's already writeable.
If the write does not need to persist across reboots, use a tmpfs mount. If your real problem is that you cannot create anything in /mnt (or /media for modern users), the issue is that someone broke something in your image, because that should work out of the box. On 13-02-19 09:27, Josef Holzmayr wrote: > Hi Bhupendra, > > On Wed, Feb 13, 2019 at 12:51:17PM +0530, Bhupendra Singh wrote: >> Hello >> >> I have built core-image-minimal with read only rootfs then now I want to >> make one directory (like /mnt) writable. >> >> Is it possible to make one directory writeable in read only rootfs if yes >> ,please tell me how can I do same. > > This is not exactly yocto specific, general linux concepts apply. You > can use a secondary, tertiary, ... partition or starage device and then > mount that as read-write. But it always has to be a seperate filesystem. > There is no way to make only one path of a given filesystem RW, it > always means that the whole filesystem is writeable. > > Greetz > -- _______________________________________________ yocto mailing list yocto@yoctoproject.org https://lists.yoctoproject.org/listinfo/yocto
