HI , I am building a custom image for OLimex A20 Micro board using the SDK. All is well except I loose all the data when a restart happens.
On investigation i found that the overy is mounted in RAM. Although the image I burned to my card is the squashfs-sdcard.
below is the output of df-h command
Filesystem Size Used Available Use% Mounted on
/dev/root 43.0M 43.0M 0 100% /rom
tmpfs 500.2M 84.0K 500.1M 0% /tmp
tmpfs 500.2M 124.5M 375.6M 25% /tmp/root
overlayfs:/tmp/root 500.2M 124.5M 375.6M 25% /
tmpfs 512.0K 0 512.0K 0% /dev
here is the debug console output on boot
U-Boot SPL 2020.04-OpenWrt-r16554-1d4dea6d4f (Apr 16 2022 - 12:59:34 +0000)
DRAM: 1024 MiB
CPU: 912000000Hz, AXI/AHB/APB: 3/2/2
Trying to boot from MMC1
U-Boot 2020.04-OpenWrt-r16554-1d4dea6d4f (Apr 16 2022 - 12:59:34 +0000) Allwinner Technology
CPU: Allwinner A20 (SUN7I)
Model: Olimex A20-Olinuxino Micro
I2C: ready
DRAM: 1 GiB
MMC: mmc@1c0f000: 0, mmc@1c12000: 1
Loading Environment from FAT... MMC: no card present
DDC: timeout reading EDID
DDC: timeout reading EDID
DDC: timeout reading EDID
Setting up a 1024x768 vga console (overscan 0x0)
In: serial
Out: vga
Err: vga
Net: eth0: ethernet@1c50000
starting USB...
Bus usb@1c14000: USB EHCI 1.00
Bus usb@1c14400: USB OHCI 1.0
Bus usb@1c1c000: USB EHCI 1.00
Bus usb@1c1c400: USB OHCI 1.0
scanning bus usb@1c14000 for devices... 1 USB Device(s) found
scanning bus usb@1c14400 for devices... 1 USB Device(s) found
scanning bus usb@1c1c000 for devices... 1 USB Device(s) found
scanning bus usb@1c1c400 for devices... 1 USB Device(s) found
scanning usb for storage devices... 0 Storage Device(s) found
Hit any key to stop autoboot: 0
switch to partitions #0, OK
mmc0 is current device
Scanning mmc 0:1...
Found U-Boot script /boot.scr
377 bytes read in 1 ms (368.2 KiB/s)
## Executing script at 43100000
3260072 bytes read in 180 ms (17.3 MiB/s)
27150 bytes read in 3 ms (8.6 MiB/s)
## Booting kernel from Legacy Image at 42000000 ...
Image Name: ARM OpenWrt Linux-5.4.188
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 3260008 Bytes = 3.1 MiB
Load Address: 40008000
Entry Point: 40008000
Verifying Checksum ... OK
## Flattened Device Tree blob at 43000000
Booting using the fdt blob at 0x43000000
EHCI failed to shut down host controller.
Loading Kernel Image
Using Device Tree in place at 43000000, end 43009a0d
Starting kernel ...
[ 0.000000] Booting Linux on physical CPU 0x0
[ 0.000000] Linux version 5.4.188 (dost@rdWs) (gcc version 8.4.0 (OpenWrt GCC 8.4.0 r16554-1d4dea6d4f)) #0 SMP Sat Apr 16 12:59:34 2022
[ 0.000000] CPU: ARMv7 Processor [410fc074] revision 4 (ARMv7), cr=30c5387d
[ 0.000000] CPU: div instructions available: patching division code
[ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
[ 0.000000] OF: fdt: Machine model: Olimex A20-Olinuxino Micro
[ 0.000000] Memory policy: Data cache writealloc
[ 0.000000] OF: reserved mem: node default-pool compatible matching fail
[ 0.000000] psci: probing for conduit method from DT.
[ 0.000000] psci: Using PSCI v0.1 Function IDs from DT
[ 0.000000] percpu: Embedded 15 pages/cpu s30924 r8192 d22324 u61440
[ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 259648
[ 0.000000] Kernel command line: console=ttyS0,115200 earlyprintk root=/dev/mmcblk0p2 rootwait
[ 0.000000] Dentry cache hash table entries: 131072 (order: 7, 524288 bytes, linear)
[ 0.000000] Inode-cache hash table entries: 65536 (order: 6, 262144 bytes, linear)
[ 0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off
[ 0.000000] Memory: 1022292K/1045504K available (6637K kernel code, 426K rwdata, 1812K rodata, 2048K init, 244K bss, 23212K reserved, 0K cma-reserved, 259072K highmem)
[ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=2, Nodes=1
[ 0.000000] rcu: Hierarchical RCU implementation.
[ 0.000000] rcu: RCU restricting CPUs from NR_CPUS=8 to nr_cpu_ids=2.
[ 0.000000] rcu: RCU calculated value of scheduler-enlistment delay is 10 jiffies.
[ 0.000000] rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=2
[ 0.000000] NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
[ 0.000000] GIC: Using split EOI/Deactivate mode
[ 0.000000] random: get_random_bytes called from start_kernel+0x2fc/0x4ac with crng_init=0
[ 0.000000] arch_timer: cp15 timer(s) running at 24.00MHz (phys).
[ 0.000000] clocksource: arch_sys_counter: mask: 0xffffffffffffff max_cycles: 0x588fe9dc0, max_idle_ns: 440795202592 ns
[ 0.000007] sched_clock: 56 bits at 24MHz, resolution 41ns, wraps every 4398046511097ns
[ 0.000020] Switching to timer-based delay loop, resolution 41ns
[ 0.000461] clocksource: timer: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 79635851949 ns
[ 0.000792] clocksource: hstimer: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 6370868154 ns
[ 0.001003] Console: colour dummy device 80x30
[ 0.001066] Calibrating delay loop (skipped), value calculated using timer frequency.. 48.00 BogoMIPS (lpj=240000)
[ 0.001082] pid_max: default: 32768 minimum: 301
[ 0.001287] Mount-cache hash table entries: 2048 (order: 1, 8192 bytes, linear)
[ 0.001307] Mountpoint-cache hash table entries: 2048 (order: 1, 8192 bytes, linear)
[ 0.002314] CPU: Testing write buffer coherency: ok
[ 0.002874] /cpus/cpu@0 missing clock-frequency property
[ 0.002898] /cpus/cpu@1 missing clock-frequency property
[ 0.002913] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
[ 0.003592] Setting up static identity map for 0x40200000 - 0x40200060
[ 0.003752] rcu: Hierarchical SRCU implementation.
[ 0.004488] smp: Bringing up secondary CPUs ...
[ 0.015353] CPU1: thread -1, cpu 1, socket 0, mpidr 80000001
[ 0.015532] smp: Brought up 1 node, 2 CPUs
[ 0.015552] SMP: Total of 2 processors activated (96.00 BogoMIPS).
[ 0.015560] CPU: All CPU(s) started in HYP mode.
[ 0.015565] CPU: Virtualization extensions available.
[ 0.022426] VFP support v0.3: implementor 41 architecture 2 part 30 variant 7 rev 4
[ 0.022747] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[ 0.022776] futex hash table entries: 512 (order: 3, 32768 bytes, linear)
[ 0.023050] pinctrl core: initialized pinctrl subsystem
[ 0.024407] NET: Registered protocol family 16
[ 0.024944] DMA: preallocated 256 KiB pool for atomic coherent allocations
[ 0.026603] No ATAGs?
[ 0.061137] SCSI subsystem initialized
[ 0.062031] usbcore: registered new interface driver usbfs
[ 0.062130] usbcore: registered new interface driver hub
[ 0.062238] usbcore: registered new device driver usb
[ 0.062480] pps_core: LinuxPPS API ver. 1 registered
[ 0.062497] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
[ 0.062534] PTP clock support registered
[ 0.063061] Advanced Linux Sound Architecture Driver Initialized.
[ 0.065097] clocksource: Switched to clocksource arch_sys_counter
[ 0.066333] simple-framebuffer 7fd00000.framebuffer: framebuffer at 0x7fd00000, 0x300000 bytes, mapped to 0x(ptrval)
[ 0.066356] simple-framebuffer 7fd00000.framebuffer: format=x8r8g8b8, mode=1024x768x32, linelength=4096
[ 0.080579] Console: switching to colour frame buffer device 128x48
[ 0.093252] simple-framebuffer 7fd00000.framebuffer: fb0: simplefb registered!
[ 0.100776] thermal_sys: Registered thermal governor 'step_wise'
[ 0.101439] NET: Registered protocol family 2
[ 0.101716] IP idents hash table entries: 16384 (order: 5, 131072 bytes, linear)
[ 0.102860] tcp_listen_portaddr_hash hash table entries: 512 (order: 0, 6144 bytes, linear)
[ 0.102912] TCP established hash table entries: 8192 (order: 3, 32768 bytes, linear)
[ 0.102997] TCP bind hash table entries: 8192 (order: 4, 65536 bytes, linear)
[ 0.103126] TCP: Hash tables configured (established 8192 bind 8192)
[ 0.103300] UDP hash table entries: 512 (order: 2, 16384 bytes, linear)
[ 0.103385] UDP-Lite hash table entries: 512 (order: 2, 16384 bytes, linear)
[ 0.103712] NET: Registered protocol family 1
[ 0.107937] kvm [1]: vgic interrupt IRQ16
[ 0.108064] kvm [1]: Hyp mode initialized successfully
[ 0.109907] workingset: timestamp_bits=14 max_order=18 bucket_order=4
[ 0.117555] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[ 0.117826] jffs2: version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME) (CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc.
[ 0.124244] bounce: pool size: 64 pages
[ 0.126071] sun4i-usb-phy 1c13400.phy: Couldn't request ID GPIO
[ 0.130057] sun4i-pinctrl 1c20800.pinctrl: initialized sunXi PIO driver
[ 0.145430] Serial: 8250/16550 driver, 8 ports, IRQ sharing disabled
[ 0.147596] sun4i-pinctrl 1c20800.pinctrl: 1c20800.pinctrl supply vcc-pb not found, using dummy regulator
[ 0.148202] printk: console [ttyS0] disabled
[ 0.168484] 1c28000.serial: ttyS0 at MMIO 0x1c28000 (irq = 51, base_baud = 1500000) is a U6_16550A
[ 0.757084] printk: console [ttyS0] enabled
[ 0.761845] sun4i-pinctrl 1c20800.pinctrl: 1c20800.pinctrl supply vcc-pi not found, using dummy regulator
[ 0.792215] 1c29800.serial: ttyS1 at MMIO 0x1c29800 (irq = 52, base_baud = 1500000) is a U6_16550A
[ 0.824122] 1c29c00.serial: ttyS2 at MMIO 0x1c29c00 (irq = 53, base_baud = 1500000) is a U6_16550A
[ 0.840607] loop: module loaded
[ 0.846296] sun4i-pinctrl 1c20800.pinctrl: 1c20800.pinctrl supply vcc-pc not found, using dummy regulator
[ 0.859734] sun4i-pinctrl 1c20800.pinctrl: 1c20800.pinctrl supply vcc-pa not found, using dummy regulator
[ 0.869691] sun7i-dwmac 1c50000.ethernet: IRQ eth_wake_irq not found
[ 0.876093] sun7i-dwmac 1c50000.ethernet: IRQ eth_lpi not found
[ 0.882155] sun7i-dwmac 1c50000.ethernet: PTP uses main clock
[ 0.887934] sun7i-dwmac 1c50000.ethernet: no reset control found
[ 0.893968] sun7i-dwmac 1c50000.ethernet: no regulator found
[ 0.899967] sun7i-dwmac 1c50000.ethernet: Version ID not available
[ 0.906205] sun7i-dwmac 1c50000.ethernet: DWMAC1000
[ 0.911172] sun7i-dwmac 1c50000.ethernet: No HW DMA feature register supported
[ 0.918422] sun7i-dwmac 1c50000.ethernet: TX Checksum insertion supported
[ 0.925235] sun7i-dwmac 1c50000.ethernet: Normal descriptors
[ 0.930892] sun7i-dwmac 1c50000.ethernet: Ring mode enabled
[ 0.940039] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[ 0.946658] ehci-platform: EHCI generic platform driver
[ 0.952513] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[ 0.958818] ohci-platform: OHCI generic platform driver
[ 0.964797] usbcore: registered new interface driver usb-storage
[ 0.971243] mousedev: PS/2 mouse device common for all mice
[ 0.977657] input: 1c22800.lradc as /devices/platform/soc/1c22800.lradc/input/input0
[ 0.986838] i2c /dev entries driver
[ 0.991595] axp20x-i2c 0-0034: AXP20x variant AXP209 found
[ 1.003519] axp20x-gpio axp20x-gpio: DMA mask not set
[ 1.010392] axp20x-gpio axp20x-gpio: AXP209 pinctrl and GPIO driver loaded
[ 1.025877] input: axp20x-pek as /devices/platform/soc/1c2ac00.i2c/i2c-0/0-0034/axp20x-pek/input/input1
[ 1.036261] ldo1: supplied by regulator-dummy
[ 1.041457] avcc: supplied by regulator-dummy
[ 1.047355] ldo3: supplied by regulator-dummy
[ 1.052028] ldo4: supplied by regulator-dummy
[ 1.057221] ldo5: supplied by regulator-dummy
[ 1.062149] vdd-cpu: supplied by regulator-dummy
[ 1.067674] vdd-int-dll: supplied by regulator-dummy
[ 1.074312] axp20x-i2c 0-0034: AXP20X driver loaded
[ 1.081837] axp20x-usb-power-supply axp20x-usb-power-supply: DMA mask not set
[ 1.091152] random: fast init done
[ 1.110334] sunxi-wdt 1c20c90.watchdog: Watchdog enabled (timeout=16 sec, nowayout=0)
[ 1.122332] sun4i-pinctrl 1c20800.pinctrl: 1c20800.pinctrl supply vcc-pf not found, using dummy regulator
[ 1.132989] sun4i-pinctrl 1c20800.pinctrl: 1c20800.pinctrl supply vcc-ph not found, using dummy regulator
[ 1.142767] sunxi-mmc 1c0f000.mmc: Got CD GPIO
[ 1.173008] sunxi-mmc 1c0f000.mmc: initialized, max. request size: 16384 KB
[ 1.181455] sunxi-mmc 1c12000.mmc: Got CD GPIO
[ 1.209728] sunxi-mmc 1c12000.mmc: initialized, max. request size: 16384 KB
[ 1.218303] sun4i-ss 1c15000.crypto-engine: Die ID 0
[ 1.228290] NET: Registered protocol family 10
[ 1.234403] Segment Routing with IPv6
[ 1.238239] NET: Registered protocol family 17
[ 1.242748] can: controller area network core (rev 20170425 abi 9)
[ 1.249024] NET: Registered protocol family 29
[ 1.253469] 8021q: 802.1Q VLAN Support v1.8
[ 1.257797] Registering SWP/SWPB emulation handler
[ 1.280102] ehci-platform 1c14000.usb: EHCI Host Controller
[ 1.285794] ehci-platform 1c14000.usb: new USB bus registered, assigned bus number 1
[ 1.293714] ehci-platform 1c14000.usb: irq 34, io mem 0x01c14000
[ 1.308570] mmc0: host does not support reading read-only switch, assuming write-enable
[ 1.322080] mmc0: new high speed SDHC card at address aaaa
[ 1.328687] mmcblk0: mmc0:aaaa SL16G 14.8 GiB
[ 1.333961] ehci-platform 1c14000.usb: USB 2.0 started, EHCI 1.00
[ 1.340664] mmcblk0: p1 p2
[ 1.344551] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.04
[ 1.352860] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 1.360090] usb usb1: Product: EHCI Host Controller
[ 1.364964] usb usb1: Manufacturer: Linux 5.4.188 ehci_hcd
[ 1.370452] usb usb1: SerialNumber: 1c14000.usb
[ 1.375656] hub 1-0:1.0: USB hub found
[ 1.379482] hub 1-0:1.0: 1 port detected
[ 1.384508] ehci-platform 1c1c000.usb: EHCI Host Controller
[ 1.390182] ehci-platform 1c1c000.usb: new USB bus registered, assigned bus number 2
[ 1.398136] ehci-platform 1c1c000.usb: irq 40, io mem 0x01c1c000
[ 1.435097] ehci-platform 1c1c000.usb: USB 2.0 started, EHCI 1.00
[ 1.441443] usb usb2: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.04
[ 1.449736] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 1.456963] usb usb2: Product: EHCI Host Controller
[ 1.461837] usb usb2: Manufacturer: Linux 5.4.188 ehci_hcd
[ 1.467327] usb usb2: SerialNumber: 1c1c000.usb
[ 1.472445] hub 2-0:1.0: USB hub found
[ 1.476306] hub 2-0:1.0: 1 port detected
[ 1.481291] ohci-platform 1c14400.usb: Generic Platform OHCI controller
[ 1.487981] ohci-platform 1c14400.usb: new USB bus registered, assigned bus number 3
[ 1.495937] ohci-platform 1c14400.usb: irq 35, io mem 0x01c14400
[ 1.569336] usb usb3: New USB device found, idVendor=1d6b, idProduct=0001, bcdDevice= 5.04
[ 1.577624] usb usb3: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 1.584838] usb usb3: Product: Generic Platform OHCI controller
[ 1.590767] usb usb3: Manufacturer: Linux 5.4.188 ohci_hcd
[ 1.596257] usb usb3: SerialNumber: 1c14400.usb
[ 1.601399] hub 3-0:1.0: USB hub found
[ 1.605255] hub 3-0:1.0: 1 port detected
[ 1.610250] ohci-platform 1c1c400.usb: Generic Platform OHCI controller
[ 1.616934] ohci-platform 1c1c400.usb: new USB bus registered, assigned bus number 4
[ 1.624862] ohci-platform 1c1c400.usb: irq 41, io mem 0x01c1c400
[ 1.699363] usb usb4: New USB device found, idVendor=1d6b, idProduct=0001, bcdDevice= 5.04
[ 1.707661] usb usb4: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 1.714877] usb usb4: Product: Generic Platform OHCI controller
[ 1.720803] usb usb4: Manufacturer: Linux 5.4.188 ohci_hcd
[ 1.726294] usb usb4: SerialNumber: 1c1c400.usb
[ 1.731449] hub 4-0:1.0: USB hub found
[ 1.735322] hub 4-0:1.0: 1 port detected
[ 1.739849] hctosys: unable to open rtc device (rtc0)
[ 1.745502] ALSA device list:
[ 1.748478] No soundcards found.
[ 1.761040] VFS: Mounted root (squashfs filesystem) readonly on device 179:2.
[ 1.770503] Freeing unused kernel memory: 2048K
[ 1.805336] Run /sbin/init as init process
[ 2.091322] init: Console is alive
[ 2.094991] init: - watchdog -
[ 2.140653] kmodloader: loading kernel modules from /etc/modules-boot.d/*
[ 2.189920] ahci-sunxi 1c18000.sata: 1c18000.sata supply ahci not found, using dummy regulator
[ 2.198738] ahci-sunxi 1c18000.sata: 1c18000.sata supply phy not found, using dummy regulator
[ 2.265368] ahci-sunxi 1c18000.sata: PHY power up failed.
[ 2.271011] ahci-sunxi: probe of 1c18000.sata failed with error -5
[ 2.277985] kmodloader: done loading kernel modules from /etc/modules-boot.d/*
[ 2.301092] init: - preinit -
[ 2.925339] random: jshn: uninitialized urandom read (4 bytes read)
[ 2.981118] random: jshn: uninitialized urandom read (4 bytes read)
[ 3.004399] random: jshn: uninitialized urandom read (4 bytes read)
Press the [f] key and hit [enter] to enter failsafe mode
Press the [1], [2], [3] or [4] key and hit [enter] to select the debug level
[ 7.234112] urandom_read: 2 callbacks suppressed
[ 7.234122] random: procd: uninitialized urandom read (4 bytes read)
[ 7.289595] mount_root: rootdisk overlay filesystem has not been formatted yet
sh: mkfs.f2fs: not found
[ 7.306839] mount_root: no usable overlay filesystem found, using tmpfs overlay
[ 7.432542] urandom-seed: Seed file not found (/etc/urandom.seed)
[ 7.570139] procd: - early -
[ 7.573134] procd: - watchdog -
[ 8.152449] procd: - watchdog -
[ 8.156289] procd: - ubus -
[ 8.210310] random: ubusd: uninitialized urandom read (4 bytes read)
[ 8.217392] random: ubusd: uninitialized urandom read (4 bytes read)
[ 8.229040] procd: - init -
Please press Enter to activate this console.
[ 9.572418] urngd: v1.0.2 started.
[ 9.675386] crng init done
[ 9.678187] random: 2 urandom warning(s) missed due to ratelimiting
[ 9.841129] kmodloader: loading kernel modules from /etc/modules.d/*
[ 9.958133] sunxi-rtc 1c20d00.rtc: registered as rtc0
[ 9.966629] debugfs: Directory '1c22c00.codec' with parent 'sun4i-codec' already present!
[ 9.976169] sun4i-codec 1c22c00.codec: Codec <-> 1c22c00.codec mapping ok
[ 10.066321] PPP generic driver version 2.4.2
[ 10.071813] NET: Registered protocol family 24
[ 10.088061] kmodloader: done loading kernel modules from /etc/modules.d/*
[ 20.339686] sun7i-dwmac 1c50000.ethernet eth0: PHY [stmmac-0:01] driver [RTL8201CP Ethernet]
[ 20.349552] sun7i-dwmac 1c50000.ethernet eth0: No Safety Features support found
[ 20.356965] sun7i-dwmac 1c50000.ethernet eth0: RX IPC Checksum Offload disabled
[ 20.364314] sun7i-dwmac 1c50000.ethernet eth0: No MAC Management Counters available
[ 20.372084] sun7i-dwmac 1c50000.ethernet eth0: PTP not supported by HW
[ 20.378722] sun7i-dwmac 1c50000.ethernet eth0: configuring for phy/mii link mode
[ 20.901900] MTD: Attempt to mount non-MTD device "/dev/loop0"
[ 22.495584] sun7i-dwmac 1c50000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[ 22.504206] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[ 31.855203] vcc5v0: disabling
[ 31.858214] ldo3: disabling
[ 31.862012] ldo4: disabling
[ 31.865638] ahci-5v: disabling
[ 31.868726] usb0-vbus: disabling
[ 46.141022] sun4i-pinctrl 1c20800.pinctrl: 1c20800.pinctrl supply vcc-pe not found, using dummy regulator
[ 68.896869] sun4i-pinctrl 1c20800.pinctrl: 1c20800.pinctrl supply vcc-pd not found, using dummy regulator
[ 70.085413] sun4i-pinctrl 1c20800.pinctrl: 1c20800.pinctrl supply vcc-pg not found, using dummy regulator
Can anyone provide help in fixing this