Turris Omnia emmc "missing" space

Hello,

I've installed OpenWrt version 19.07.7 on my Turris Omnia 2019 router, and the 8GB emmc flash storage (it appears to be available through /dev/mmcblk0 device) does not seems to be fully partitioned / used :

NAME         MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
loop0          7:0    0 253.1M  0 loop /overlay
sda            8:0    1 238.5G  0 disk
└─sda1         8:1    1 238.5G  0 part
mtdblock0     31:0    0     1M  0 disk
mtdblock1     31:1    0     7M  0 disk
mmcblk0      179:0    0   7.3G  0 disk
├─mmcblk0p1  179:1    0  16.3M  0 part
└─mmcblk0p2  179:2    0 256.3M  0 part /rom
mmcblk0boot0 179:8    0     4M  1 disk
mmcblk0boot1 179:16   0     4M  1 disk

Is it a normal behaviour or should I report a bug ?

Is there a way to use all emmc space available with OpenWrt ?

Could try to resize it