[Duo S] - Cannot mount SD card

Duo
1

Hi,

I am facing issue with mounting SD card on milkV duoS.
I have installed the firmware on eMMC.

I can mount in read-only,

[root@milkv-duo]/mnt/system# mount -r -t ext4 /dev/mmcblk1 /media/sd
[root@milkv-duo]/mnt/system# ls /media/sd/
README.1st  lost+found

but I cannot mount in ‘rw’.

[root@milkv-duo]/mnt/system# mount -t ext4 /dev/mmcblk1 /media/sd
mount: mounting /dev/mmcblk1 on /media/sd failed: I/O error

The sd card works on another hardware linux distribution.
I try to fsck, but nothin better

[root@milkv-duo]/mnt/system# fsck.ext4 -y /dev/mmcblk1
e2fsck 1.47.2 (1-Jan-2025)
/dev/mmcblk1: clean, 12/242400 files, 35392/968064 blocks

I try to format the sd card with and without partition, but none of these attempts change something.

Is what I am trying to do even possible, or did I missed something ?

[root@milkv-duo]/mnt/system# cat /etc/os-release 2>/dev/null
NAME=Buildroot
VERSION=-g6b03c2762
ID=buildroot
VERSION_ID=2025.02
PRETTY_NAME="Buildroot 2025.02"

Thanks !

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