PROCESSOR-SDK-AM437X: Boot from network failing with: Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)

Rajan Chand

Hello,

I am trying to boot the kernel on the AM473x-EVM from the network using U-Boot command 'netboot'. I am using the zImage provided under 'prebuilt-images' in the SDK (version 07.03.00.005). Additionally, I added the environment variable fdtfile to be set to am437-gp-evm.dtb (again from prebuilt-images).

The server seems to function as expected and zImage & am437-gp-evm.dtb are loaded successfully over the network.

However, boot fails with the output: Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0). Logfile attached.

U-Boot is running from MMC0 (provided with the EVM); it is dated from 2015. Is this version compatible with the zImage I am using?

Thanks,

Rajan

7776.am437x_boot_log.txt

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=~=~=~=~=~=~=~=~=~=~=~= PuTTY log 2022.02.17 18:25:47 =~=~=~=~=~=~=~=~=~=~=~=
�
U-Boot SPL 2014.07-g7e537bf (Apr 10 2015 - 14:57:18)
SPL: Please implement spl_start_uboot() for your board
SPL: Direct Linux boot not active!
reading u-boot.img
reading u-boot.img
U-Boot 2014.07-g7e537bf (Apr 10 2015 - 14:57:18)
I2C:   ready
DRAM:  1 GiB
NAND:  512 MiB
MMC:   OMAP SD/MMC: 0, OMAP SD/MMC: 1
reading uboot.env
** Unable to read "uboot.env" from mmc0:1 **
Using default environment
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

=~=~=~=~=~=~=~=~=~=~=~= PuTTY log 2022.02.17 18:25:47 =~=~=~=~=~=~=~=~=~=~=~=
�
U-Boot SPL 2014.07-g7e537bf (Apr 10 2015 - 14:57:18)
SPL: Please implement spl_start_uboot() for your board
SPL: Direct Linux boot not active!
reading u-boot.img
reading u-boot.img


U-Boot 2014.07-g7e537bf (Apr 10 2015 - 14:57:18)

I2C:   ready
DRAM:  1 GiB
NAND:  512 MiB
MMC:   OMAP SD/MMC: 0, OMAP SD/MMC: 1
reading uboot.env

** Unable to read "uboot.env" from mmc0:1 **
Using default environment

Net:   <ethaddr> not set. Validating first E-fuse MAC
cpsw, usb_ether
Hit any key to stop autoboot:  1  0 
U-Boot# gggg    setenv fdtfile am437x-gp-evm.dtb
U-Boot# run netboot
Booting from network ...
link up on port 0, speed 1000, full duplex
BOOTP broadcast 1
DHCP client bound to address 10.1.1.23
link up on port 0, speed 1000, full duplex
Using cpsw device
TFTP from server 10.1.1.243; our IP address is 10.1.1.23
Filename 'zImage'.
Load address: 0x82000000
Loading: *#################################################################
	 #################################################################
	 #################################################################
	 #################################################################
	 ###########################################################
	 7.6 MiB/s
done
Bytes transferred = 4674048 (475200 hex)
link up on port 0, speed 1000, full duplex
Using cpsw device
TFTP from server 10.1.1.243; our IP address is 10.1.1.23
Filename 'am437x-gp-evm.dtb'.
Load address: 0x88000000
Loading: *######
	 9.2 MiB/s
done
Bytes transferred = 77241 (12db9 hex)
Kernel image @ 0x82000000 [ 0x000000 - 0x475200 ]
## Flattened Device Tree blob at 88000000
   Booting using the fdt blob at 0x88000000
   Loading Device Tree to 8ffea000, end 8ffffdb8 ... OK

Starting kernel ...

[    0.000000] Booting Linux on physical CPU 0x0
[    0.000000] Linux version 5.4.106-g023faefa70 (oe-user@oe-host) (gcc version 9.2.1 20191025 (GNU Toolchain for the A-profile Architecture 9.2-2019.12 (arm-9.10))) #1 PREEMPT Fri Jul 2 11:03:51 UTC 2021
[    0.000000] CPU: ARMv7 Processor [412fc09a] revision 10 (ARMv7), cr=10c53c7d
[    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
[    0.000000] OF: fdt: Machine model: TI AM437x GP EVM
[    0.000000] Memory policy: Data cache writeback
[    0.000000] efi: Getting EFI parameters from FDT:
[    0.000000] efi: UEFI not found.
[    0.000000] cma: Reserved 48 MiB at 0xbd000000
[    0.000000] CPU: All CPU(s) started in SVC mode.
[    0.000000] AM437x ES1.2 (sgx neon)
[    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 260416
[    0.000000] Kernel command line: console=ttyO0,115200n8 root=/dev/nfs nfsroot=10.1.1.243:/export/rootfs,nolock rw ip=dhcp
[    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: 974184K/1048576K available (9216K kernel code, 304K rwdata, 3108K rodata, 1024K init, 259K bss, 25240K reserved, 49152K cma-reserved, 212992K highmem)
[    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[    0.000000] rcu: Preemptible hierarchical RCU implementation.
[    0.000000] 	Tasks RCU enabled.
[    0.000000] rcu: RCU calculated value of scheduler-enlistment delay is 10 jiffies.
[    0.000000] NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
[    0.000000] L2C: platform modifies aux control register: 0x0e030000 -> 0x3e430000
[    0.000000] L2C: DT/platform modifies aux control register: 0x0e030000 -> 0x3e430000
[    0.000000] L2C-310 enabling early BRESP for Cortex-A9
[    0.000000] OMAP L2C310: ROM does not support power control setting
[    0.000000] L2C-310 dynamic clock gating disabled, standby mode disabled
[    0.000000] L2C-310 cache controller enabled, 16 ways, 256 kB
[    0.000000] L2C-310: CACHE_ID 0x410000c9, AUX_CTRL 0x4e430000
[    0.000000] random: get_random_bytes called from start_kernel+0x2b4/0x470 with crng_init=0
[    0.000000] OMAP clockevent source: timer2 at 24000000 Hz
[    0.000012] sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 89478484971ns
[    0.000029] clocksource: timer1: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 79635851949 ns
[    0.000038] OMAP clocksource: timer1 at 24000000 Hz
[    0.000483] clocksource: 32k_counter: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 58327039986419 ns
[    0.000492] OMAP clocksource: 32k_counter at 32768 Hz
[    0.001025] Console: colour dummy device 80x30
[    0.001055] WARNING: Your 'console=ttyO0' has been replaced by 'ttyS0'
[    0.001060] This ensures that you still see kernel messages. Please
[    0.001064] update your kernel commandline.
[    0.001102] Calibrating delay loop... 1987.37 BogoMIPS (lpj=9936896)
[    0.060185] pid_max: default: 32768 minimum: 301
[    0.060379] Mount-cache hash table entries: 2048 (order: 1, 8192 bytes, linear)
[    0.060402] Mountpoint-cache hash table entries: 2048 (order: 1, 8192 bytes, linear)
[    0.061271] CPU: Testing write buffer coherency: ok
[    0.061332] CPU0: Spectre v2: using BPIALL workaround
[    0.062173] Setting up static identity map for 0x80100000 - 0x80100060
[    0.062313] rcu: Hierarchical SRCU implementation.
[    0.062393] EFI services will not be available.
[    0.062868] devtmpfs: initialized
[    0.074585] VFP support v0.3: implementor 41 architecture 3 part 30 variant 9 rev 4
[    0.074981] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[    0.075003] futex hash table entries: 256 (order: -1, 3072 bytes, linear)
[    0.078149] pinctrl core: initialized pinctrl subsystem
[    0.078915] DMI not present or invalid.
[    0.079360] NET: Registered protocol family 16
[    0.081041] DMA: preallocated 256 KiB pool for atomic coherent allocations
[    0.114844] l3s-clkctrl:01f8:0: failed to disable
[    0.116550] cpuidle: using governor ladder
[    0.116579] cpuidle: using governor menu
[    0.118267] omap_l3_noc 44000000.ocp: L3 debug error: target 8 mod:0 (unclearable)
[    0.118336] omap_l3_noc 44000000.ocp: L3 application error: target 8 mod:0 (unclearable)
[    0.135901] No ATAGs?
[    0.135921] hw-breakpoint: found 5 (+1 reserved) breakpoint and 1 watchpoint registers.
[    0.135936] hw-breakpoint: maximum watchpoint size is 4 bytes.
[    0.151461] debugfs: Directory '49000000.edma' with parent 'dmaengine' already present!
[    0.151490] edma 49000000.edma: TI EDMA DMA engine driver
[    0.153605] iommu: Default domain type: Translated 
[    0.155960] SCSI subsystem initialized
[    0.156463] mc: Linux media interface: v0.10
[    0.156502] videodev: Linux video capture interface: v2.00
[    0.156612] pps_core: LinuxPPS API ver. 1 registered
[    0.156619] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
[    0.156641] PTP clock support registered
[    0.156671] EDAC MC: Ver: 3.0.0
[    0.157832] Advanced Linux Sound Architecture Driver Initialized.
[    0.158944] clocksource: Switched to clocksource timer1
[    0.165825] thermal_sys: Registered thermal governor 'fair_share'
[    0.165832] thermal_sys: Registered thermal governor 'bang_bang'
[    0.165845] thermal_sys: Registered thermal governor 'step_wise'
[    0.165851] thermal_sys: Registered thermal governor 'user_space'
[    0.165857] thermal_sys: Registered thermal governor 'power_allocator'
[    0.166515] NET: Registered protocol family 2
[    0.167207] tcp_listen_portaddr_hash hash table entries: 512 (order: 0, 4096 bytes, linear)
[    0.167238] TCP established hash table entries: 8192 (order: 3, 32768 bytes, linear)
[    0.167297] TCP bind hash table entries: 8192 (order: 3, 32768 bytes, linear)
[    0.167371] TCP: Hash tables configured (established 8192 bind 8192)
[    0.167544] UDP hash table entries: 512 (order: 1, 8192 bytes, linear)
[    0.167568] UDP-Lite hash table entries: 512 (order: 1, 8192 bytes, linear)
[    0.167725] NET: Registered protocol family 1
[    0.168271] RPC: Registered named UNIX socket transport module.
[    0.168284] RPC: Registered udp transport module.
[    0.168288] RPC: Registered tcp transport module.
[    0.168293] RPC: Registered tcp NFSv4.1 backchannel transport module.
[    0.168306] PCI: CLS 0 bytes, default 64
[    0.170360] Initialise system trusted keyrings
[    0.170665] workingset: timestamp_bits=14 max_order=18 bucket_order=4
[    0.174932] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[    0.175663] NFS: Registering the id_resolver key type
[    0.175699] Key type id_resolver registered
[    0.175705] Key type id_legacy registered
[    0.175756] ntfs: driver 2.1.32 [Flags: R/O].
[    0.176447] Key type asymmetric registered
[    0.176461] Asymmetric key parser 'x509' registered
[    0.176508] bounce: pool size: 64 pages
[    0.176556] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 244)
[    0.176565] io scheduler mq-deadline registered
[    0.176571] io scheduler kyber registered
[    0.203289] OMAP GPIO hardware version 0.1
[    0.205491] omap-mailbox 480c8000.mailbox: omap mailbox rev 0x400
[    0.227841] ti-sysc 48322000.target-module: dts flag should be at module level for ti,no-reset-on-init
[    0.236919] l3s-clkctrl:01f8:0: failed to disable
[    0.243970] pinctrl-single 44e10800.pinmux: 199 pins, size 796
[    0.248326] pwm-backlight backlight: backlight supply power not found, using dummy regulator
[    0.290657] Serial: 8250/16550 driver, 10 ports, IRQ sharing enabled
[    0.294163] omap8250 44e09000.serial: No clock speed specified: using default: 48000000
[    0.294983] 44e09000.serial: ttyS0 at MMIO 0x44e09000 (irq = 67, base_baud = 3000000) is a 8250
[    1.006186] printk: console [ttyS0] enabled
[    1.011166] omap8250 481a6000.serial: No clock speed specified: using default: 48000000
[    1.019987] 481a6000.serial: ttyS3 at MMIO 0x481a6000 (irq = 81, base_baud = 3000000) is a 8250
[    1.031386] omap_rng 48310000.rng: Random Number Generator ver. 20
[    1.039174] random: fast init done
[    1.042833] random: crng init done
[    1.046388] omapdss_dss 4832a000.dss: 4832a000.dss supply vdda_video not found, using dummy regulator
[    1.061727] panel-simple display: display supply power not found, using dummy regulator
[    1.082488] brd: module loaded
[    1.094898] loop: module loaded
[    1.103679] libphy: Fixed MDIO Bus: probed
[    1.168967] davinci_mdio 4a101000.mdio: davinci mdio revision 1.6, bus freq 1000000
[    1.176669] libphy: 4a101000.mdio: probed
[    1.182382] davinci_mdio 4a101000.mdio: phy[0]: device 4a101000.mdio:00, driver Micrel KSZ9031 Gigabit PHY
[    1.192292] cpsw 4a100000.ethernet: initialized cpsw ale version 1.4
[    1.198679] cpsw 4a100000.ethernet: ALE Table size 1024
[    1.204085] cpsw 4a100000.ethernet: cpts: overflow check period 500 (jiffies)
[    1.211377] cpsw 4a100000.ethernet: Detected MACID = 34:b1:f7:3d:b9:ae
[    1.219779] i2c /dev entries driver
[    1.225924] cpuidle: enable-method property 'ti,am4372' found operations
[    1.233452] sdhci: Secure Digital Host Controller Interface driver
[    1.239730] sdhci: Copyright(c) Pierre Ossman
[    1.259237] sdhci-pltfm: SDHCI platform and OF driver helper
[    1.266222] ledtrig-cpu: registered to indicate activity on CPUs
[    1.275786] davinci-mcasp 4803c000.mcasp: IRQ common not found
[    1.283179] NET: Registered protocol family 10
[    1.288782] Segment Routing with IPv6
[    1.292642] sit: IPv6, IPv4 and MPLS over IPv4 tunneling driver
[    1.299415] NET: Registered protocol family 17
[    1.304274] Key type dns_resolver registered
[    1.308699] omap_voltage_late_init: Voltage driver support not added
[    1.315750] Loading compiled-in X.509 certificates
[    1.336186] omap-gpmc 50000000.gpmc: GPMC revision 6.0
[    1.341501] gpmc_mem_init: disabling cs 0 mapped at 0x0-0x1000000
[    1.349292] nand: device found, Manufacturer ID: 0x2c, Chip ID: 0xdc
[    1.355678] nand: Micron MT29F4G08ABAEAWP
[    1.359732] nand: 512 MiB, SLC, erase size: 256 KiB, page size: 4096, OOB size: 224
[    1.367568] Using OMAP_ECC_BCH16_CODE_HW ECC scheme
[    1.372594] 10 fixed-partitions partitions found on MTD device omap2-nand.0
[    1.379605] Creating 10 MTD partitions on "omap2-nand.0":
[    1.385032] 0x000000000000-0x000000040000 : "NAND.SPL"
[    1.391838] 0x000000040000-0x000000080000 : "NAND.SPL.backup1"
[    1.398929] 0x000000080000-0x0000000c0000 : "NAND.SPL.backup2"
[    1.406087] 0x0000000c0000-0x000000100000 : "NAND.SPL.backup3"
[    1.413200] 0x000000100000-0x000000180000 : "NAND.u-boot-spl-os"
[    1.420488] 0x000000180000-0x000000280000 : "NAND.u-boot"
[    1.427183] 0x000000280000-0x0000002c0000 : "NAND.u-boot-env"
[    1.434228] 0x0000002c0000-0x000000300000 : "NAND.u-boot-env.backup1"
[    1.441966] 0x000000300000-0x000000a00000 : "NAND.kernel"
[    1.449504] 0x000000a00000-0x000020000000 : "NAND.file-system"
[    1.523667] GPIO line 119 (SelEMMCorNAND) hogged as output/low
[    1.574968] omap_i2c 44e0b000.i2c: bus 0 rev0.12 at 100 kHz
[    1.582339] omap_i2c 4802a000.i2c: bus 1 rev0.12 at 100 kHz
[    1.588368] GPIO line 136 (SelLCDorHDMI) hogged as output/high
[    1.597732] omapdss_dss 4832a000.dss: 4832a000.dss supply vdda_video not found, using dummy regulator
[    1.607221] DSS: OMAP DSS rev 2.0
[    1.611597] omapdss_dss 4832a000.dss: bound 4832a400.dispc (ops dispc_component_ops)
[    1.619922] omapdrm omapdrm.0: DMM not available, disable DMM support
[    1.626690] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[    1.633381] [drm] No driver support for vblank timestamp query.
[    1.701956] Console: switching to colour frame buffer device 100x30
[    1.725019] omapdrm omapdrm.0: fb0: omapdrmdrmfb frame buffer device
[    1.732108] [drm] Initialized omapdrm 1.0.0 20110917 for omapdrm.0 on minor 0
[    1.741471] omap_gpio 44e07000.gpio: Could not set line 6 debounce to 200000 microseconds (-22)
[    1.750367] omap_hsmmc 48060000.mmc: Got CD GPIO
[    1.808013] hctosys: unable to open rtc device (rtc0)
[    1.816638] cpsw 4a100000.ethernet: initializing cpsw version 1.15 (0)
[    1.845333] mmc0: host does not support reading read-only switch, assuming write-enable
[    1.856788] mmc0: new high speed SDHC card at address aaaa
[    1.863241] mmcblk0: mmc0:aaaa SU08G 7.40 GiB 
[    1.870566]  mmcblk0: p1 p2 p3
[    1.925378] Micrel KSZ9031 Gigabit PHY 4a101000.mdio:00: attached PHY driver [Micrel KSZ9031 Gigabit PHY] (mii_bus:phy_addr=4a101000.mdio:00, irq=POLL)
[    6.090248] cpsw 4a100000.ethernet eth0: Link is Up - 1Gbps/Full - flow control off
[    6.109057] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[    6.139090] Sending DHCP requests ., OK
[    6.182969] IP-Config: Got DHCP answer from 10.1.1.243, my address is 10.1.1.23
[    6.190569] IP-Config: Complete:
[    6.193946]      device=eth0, hwaddr=34:b1:f7:3d:b9:ae, ipaddr=10.1.1.23, mask=255.255.255.0, gw=10.1.1.1
[    6.203731]      host=10.1.1.23, domain=internal.example.org, nis-domain=(none)
[    6.211323]      bootserver=10.1.1.243, rootserver=10.1.1.243, rootpath=
[    6.211335]      nameserver0=10.1.1.243
[    6.223330] ALSA device list:
[    6.226492]   No soundcards found.
[   36.329017] vmmcwl_fixed: disabling
[  102.252513] VFS: Unable to mount root fs via NFS, trying floppy.
[  102.259995] VFS: Cannot open root device "nfs" or unknown-block(2,0): error -6
[  102.267388] Please append a correct "root=" boot option; here are the available partitions:
[  102.276127] 0100           65536 ram0 
[  102.276134]  (driver?)
[  102.282591] 0101           65536 ram1 
[  102.282595]  (driver?)
[  102.288733] 0102           65536 ram2 
[  102.288736]  (driver?)
[  102.295105] 0103           65536 ram3 
[  102.295109]  (driver?)
[  102.301359] 0104           65536 ram4 
[  102.301362]  (driver?)
[  102.307558] 0105           65536 ram5 
[  102.307561]  (driver?)
[  102.313776] 0106           65536 ram6 
[  102.313778]  (driver?)
[  102.320093] 0107           65536 ram7 
[  102.320095]  (driver?)
[  102.326223] 0108           65536 ram8 
[  102.326225]  (driver?)
[  102.332388] 0109           65536 ram9 
[  102.332390]  (driver?)
[  102.338517] 010a           65536 ram10 
[  102.338519]  (driver?)
[  102.344747] 010b           65536 ram11 
[  102.344749]  (driver?)
[  102.350988] 010c           65536 ram12 
[  102.350990]  (driver?)
[  102.357205] 010d           65536 ram13 
[  102.357207]  (driver?)
[  102.363434] 010e           65536 ram14 
[  102.363436]  (driver?)
[  102.369661] 010f           65536 ram15 
[  102.369663]  (driver?)
[  102.375883] 1f00             256 mtdblock0 
[  102.375886]  (driver?)
[  102.382472] 1f01             256 mtdblock1 
[  102.382474]  (driver?)
[  102.389049] 1f02             256 mtdblock2 
[  102.389051]  (driver?)
[  102.395614] 1f03             256 mtdblock3 
[  102.395617]  (driver?)
[  102.402191] 1f04             512 mtdblock4 
[  102.402193]  (driver?)
[  102.408756] 1f05            1024 mtdblock5 
[  102.408758]  (driver?)
[  102.415345] 1f06             256 mtdblock6 
[  102.415347]  (driver?)
[  102.421923] 1f07             256 mtdblock7 
[  102.421925]  (driver?)
[  102.428488] 1f08            7168 mtdblock8 
[  102.428490]  (driver?)
[  102.435064] 1f09          514048 mtdblock9 
[  102.435067]  (driver?)
[  102.441691] b300         7761920 mmcblk0 
[  102.441694]  driver: mmcblk
[  102.448521]   b301           72261 mmcblk0p1 00000000-01
[  102.448523] 
[  102.455362]   b302          722925 mmcblk0p2 00000000-02
[  102.455364] 
[  102.462214]   b303         6956145 mmcblk0p3 00000000-03
[  102.462216] 
[  102.469052] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)
[  102.477359] ---[ end Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0) ]---

over 3 years ago

+1 Hong Guan64 over 3 years ago

TI__Guru 65135 points

Hi Rajan,
It looks kernel/dtb loading from TFTP is ok from your log.
One suspicious is rootfs NFS configuration as shown in your log:
Kernel command line: console=ttyO0,115200n8 root=/dev/nfs nfsroot=10.1.1.243:/export/rootfs,nolock rw ip=dhcp

These links are helpful reference
www.kernel.org/.../nfsroot.txt
e2e.ti.com/.../processor-sdk-am335x-nfs-boot-settings

Best,
-Hong

0 Rajan Chand over 3 years ago in reply to Hong Guan64

Prodigy 60 points

Thanks Hong. The problem was that the environment variables were not all set correctly in U-boot. After correcting them (taken from the minicom script created from the SDK) this was resolved. Thank you.

Kind Regards,

Rajan

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PROCESSOR-SDK-AM437X: Boot from network failing with: Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)