Just make a test, I can successfully make a /test folder by rebuilding WP76 R16 yocto source.
-
open the following files
./meta-swi-extras/meta-swi-mdm9x28-bin/recipes/sierra/sierra_git.bb
./meta-swi-extras/meta-swi-mdm9x28-src/recipes/sierra/sierra_git.bb -
just copy what is done in that file for
FLASH_MOUNTPOINT_LEGATOand do the same for your folder
root@swi-mdm9x28-wp:~# ls /
WEBSERVER dev legato mnt sbin usr
bin etc lib opt sys var
boot firmware linuxrc proc test
data home media run tmp