When the Putty serial port is connected, Arria10 is normally logged in. If you enter root, the file system will report an error. As follows：
Poky (Yocto Project Reference Distro) 4.1.3 arria10 ttyS0
arria10 login: root
[ 27.280241] mmc0: card aaaa removed
[ 27.284620] EXT4-fs warning (device mmcblk0p2): ext4_end_bio:348: I/O error 10 writing to inode 653021 starting block 3748753)
[ 27.296070] Buffer I/O error on device mmcblk0p2, logical block 3651584
[ 27.305377] Aborting journal on device mmcblk0p2-8.
[ 27.310409] JBD2: Error -5 detected when updating journal superblock for mmcblk0p2-8.
[ 27.392651] mmc_host mmc0: Bus speed (slot 0) = 50020250Hz (slot req 400000Hz, actual 396986HZ div = 63)
[ 27.480620] mmc_host mmc0: Bus speed (slot 0) = 50020250Hz (slot req 50000000Hz, actual 25010125HZ div = 1)
[ 27.490400] mmc0: new high speed SDHC card at address aaaa
[ 27.497003] mmcblk0: mmc0:aaaa SC16G 14.8 GiB
[ 27.499310] EXT4-fs error (device mmcblk0p2): __ext4_find_entry:1665: inode #130611: comm systemd-udevd: reading directory lbloc k 0
[ 27.503629] debugfs: Directory ‘mmcblk0’ with parent ‘block’ already present!
[ 27.513656] EXT4-fs error (device mmcblk0p2): __ext4_find_entry:1665: inode #130611: comm systemd-udevd: reading directory lbloc k 0
[ 27.527014] mmcblk0: p1 p2 p3
[ 27.534156] EXT4-fs error (device mmcblk0p2): __ext4_find_entry:1665: inode #130611: comm systemd-udevd: reading directory lbloc k 0
[ 27.601767] EXT4-fs error (device mmcblk0p2): __ext4_find_entry:1665: inode #522259: comm socfpga-gsrd-in: reading directory lbl ock 0
[ 27.613946] EXT4-fs error (device mmcblk0p2): __ext4_find_entry:1665: inode #522259: comm socfpga-gsrd-in: reading directory lbl ock 0
[ 27.626115] EXT4-fs error (device mmcblk0p2): __ext4_find_entry:1665: inode #523000: comm socfpga-gsrd-in: reading directory lbl ock 0
[ 27.638308] EXT4-fs error (device mmcblk0p2): __ext4_find_entry:1665: inode #522260: comm socfpga-gsrd-in: reading directory lbl ock 0
[ 27.650425] EXT4-fs error (device mmcblk0p2): __ext4_find_entry:1665: inode #652905: comm socfpga-gsrd-in: reading directory lbl ock 0
[ 27.662567] EXT4-fs error (device mmcblk0p2): __ext4_find_entry:1665: inode #652801: comm socfpga-gsrd-in: reading directory lbl ock 0
[ 27.675191] EXT4-fs error (device mmcblk0p2): __ext4_find_entry:1665: inode #522259: comm socfpga-gsrd-in: reading directory lbl ock 0
[ 28.246250] lcd_cmd_no_params: i2c_master_send returns -121
[ 28.252529] lcd_cmd_one_param: i2c_master_send returns -121
[ 28.258877] lcd_cmd_one_param: i2c_master_send returns -121
[ 28.264916] lcd_cmd_one_param: i2c_master_send returns -121
[ 28.270895] EXT4-fs (mmcblk0p2): Remounting filesystem read-only
[ 31.857967] 0.33V: disabling
[ 36.535446] EXT4-fs error: 1967 callbacks suppressed
[ 36.535474] EXT4-fs error (device mmcblk0p2): __ext4_find_entry:1665: inode #261121: comm systemd-timesyn: reading directory lbl ock 0
[ 36.552657] EXT4-fs error (device mmcblk0p2): __ext4_find_entry:1665: inode #261121: comm sd-resolve: reading directory lblock 0
[ 36.564873] EXT4-fs error (device mmcblk0p2): __ext4_find_entry:1665: inode #261121: comm sd-resolve: reading directory lblock 0
[ 36.577295] EXT4-fs error (device mmcblk0p2): __ext4_find_entry:1665: inode #261121: comm systemd-timesyn: reading directory lbl ock 0
[ 36.589454] EXT4-fs error (device mmcblk0p2): __ext4_find_entry:1665: inode #261121: comm sd-resolve: reading directory lblock 0
[ 36.601636] EXT4-fs error (device mmcblk0p2): __ext4_find_entry:1665: inode #261121: comm sd-resolve: reading directory lblock 0
[ 36.613997] EXT4-fs error (device mmcblk0p2): __ext4_find_entry:1665: inode #261121: comm systemd-timesyn: reading directory lbl ock 0
[ 36.626185] EXT4-fs error (device mmcblk0p2): __ext4_find_entry:1665: inode #261121: comm sd-resolve: reading directory lblock 0
[ 36.638405] EXT4-fs error (device mmcblk0p2): __ext4_find_entry:1665: inode #261121: comm sd-resolve: reading directory lblock 0
[ 36.650250] EXT4-fs error (device mmcblk0p2): __ext4_find_entry:1665: inode #261121: comm systemd-timesyn: reading directory lbl ock 0