A little more info from dmsg that might help figure it out.

[ 9.041551] mmc0: new high speed SDHC card at address 0001
[ 9.048151] mmcblk0: mmc0:0001 EB1QT 29.8 GiB
[ 9.054241] mmcblk0: p1
[ 10.473524] mtk_soc_eth 1e100000.ethernet: PPE started

[ 22.730970] JBD2: no valid journal superblock found
[ 22.735901] EXT4-fs (mmcblk0p1): error loading journal