Hello,
I have been following the guide from bootlin about embedded linux using a Beaglebone Black (not wireless) and I am trying to follow the labs.
I followed the guides and even had NFS working at one point. However after a while I started getting an error VFS: Unable to mount root fs via nfs followed by a kernel panic because it can’t find init.
Starting kernel …
[ 0.000000] Booting Linux on physical CPU 0x0
[ 0.000000] Linux version 6.6.58-dirty (br-user@3e497a26cc59) (arm-linux-gcc (crosstool-NG 1.26.0) 13.2.0, GNU ld (crosstool-NG 1.26.0) 2.40) #2 SMP Wed Oct 30 19:59:08 UTC 2024
[ 0.000000] CPU: ARMv7 Processor [413fc082] revision 2 (ARMv7), cr=10c5387d
[ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
[ 0.000000] OF: fdt: Machine model: TI AM335x BeagleBone Black
[ 0.000000] Memory policy: Data cache writeback
[ 0.000000] cma: Reserved 16 MiB at 0x9e800000 on node -1
[ 0.000000] Zone ranges:
[ 0.000000] Normal [mem 0x0000000080000000-0x000000009fdfffff]
[ 0.000000] HighMem empty
[ 0.000000] Movable zone start for each node
[ 0.000000] Early memory node ranges
[ 0.000000] node 0: [mem 0x0000000080000000-0x000000009fdfffff]
[ 0.000000] Initmem setup node 0 [mem 0x0000000080000000-0x000000009fdfffff]
[ 0.000000] CPU: All CPU(s) started in SVC mode.
[ 0.000000] AM335X ES2.1 (sgx neon)
[ 0.000000] percpu: Embedded 16 pages/cpu s36052 r8192 d21292 u65536
[ 0.000000] Kernel command line: console=ttyS0,115200n8 rootwait root=/dev/nfs ip=192.168.0.100:::::usb0 g_ether.dev_addr=f8:dc:7a:00:00:02 g_ether.host_addr=f8:dc:7a:00:00:01 nfsroot=192.168.0.1:/home/satrapes/Projects/bootlin/embedded-linux/embedded-linux-bbb-labs/tinysystem/nfsroot,nfsvers=3,tcp rw
[ 0.000000] Dentry cache hash table entries: 65536 (order: 6, 262144 bytes, linear)
[ 0.000000] Inode-cache hash table entries: 32768 (order: 5, 131072 bytes, linear)
[ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 129412
[ 0.000000] mem auto-init: stack:all(zero), heap alloc:off, heap free:off
[ 0.000000] Memory: 483712K/522240K available (11264K kernel code, 1109K rwdata, 2540K rodata, 1024K init, 281K bss, 22144K reserved, 16384K cma-reserved, 0K highmem)
[ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[ 0.000000] trace event string verifier disabled
[ 0.000000] rcu: Hierarchical RCU implementation.
[ 0.000000] rcu: RCU event tracing is enabled.
[ 0.000000] rcu: RCU restricting CPUs from NR_CPUS=2 to nr_cpu_ids=1.
[ 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=1
[ 0.000000] NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
[ 0.000000] IRQ: Found an INTC at 0x(ptrval) (revision 5.0) with 128 interrupts
[ 0.000000] rcu: srcu_init: Setting srcu_struct sizes based on contention.
[ 0.000000] TI gptimer clocksource: always-on /ocp/interconnect@44c00000/segment@200000/target-module@31000
[ 0.000002] sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 89478484971ns
[ 0.000025] clocksource: dmtimer: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 79635851949 ns
[ 0.000495] TI gptimer clockevent: 24000000 Hz at /ocp/interconnect@48000000/segment@0/target-module@40000
[ 0.001929] Console: colour dummy device 80x30
[ 0.002012] Calibrating delay loop… 996.14 BogoMIPS (lpj=4980736)
[ 0.090544] CPU: Testing write buffer coherency: ok
[ 0.090650] CPU0: Spectre v2: using BPIALL workaround
[ 0.090662] pid_max: default: 32768 minimum: 301
[ 0.090782] LSM: initializing lsm=capability,integrity
[ 0.090952] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
[ 0.090971] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
[ 0.092442] CPU0: thread -1, cpu 0, socket -1, mpidr 0
[ 0.094032] Setting up static identity map for 0x80100000 - 0x80100078
[ 0.094314] rcu: Hierarchical SRCU implementation.
[ 0.094325] rcu: Max phase no-delay instances is 1000.
[ 0.095060] smp: Bringing up secondary CPUs …
[ 0.095106] smp: Brought up 1 node, 1 CPU
[ 0.095120] SMP: Total of 1 processors activated (996.14 BogoMIPS).
[ 0.095130] CPU: All CPU(s) started in SVC mode.
[ 0.095989] devtmpfs: initialized
[ 0.111056] VFP support v0.3: implementor 41 architecture 3 part 30 variant c rev 3
[ 0.111423] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[ 0.111460] futex hash table entries: 256 (order: 2, 16384 bytes, linear)
[ 0.112685] pinctrl core: initialized pinctrl subsystem
[ 0.114452] NET: Registered PF_NETLINK/PF_ROUTE protocol family
[ 0.117650] DMA: preallocated 256 KiB pool for atomic coherent allocations
[ 0.118256] audit: initializing netlink subsys (disabled)
[ 0.119540] thermal_sys: Registered thermal governor ‘fair_share’
[ 0.119559] thermal_sys: Registered thermal governor ‘step_wise’
[ 0.119565] thermal_sys: Registered thermal governor ‘user_space’
[ 0.119669] audit: type=2000 audit(0.110:1): state=initialized audit_enabled=0 res=1
[ 0.119745] cpuidle: using governor menu
[ 0.139454] No ATAGs?
[ 0.139480] hw-breakpoint: debug architecture 0x4 unsupported.
[ 0.142438] kprobes: kprobe jump-optimization is enabled. All kprobes are optimized if possible.
[ 0.163524] iommu: Default domain type: Translated
[ 0.163543] iommu: DMA domain TLB invalidation policy: strict mode
[ 0.164895] SCSI subsystem initialized
[ 0.171506] pps_core: LinuxPPS API ver. 1 registered
[ 0.171518] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti giometti@linux.it
[ 0.171542] PTP clock support registered
[ 0.180783] vgaarb: loaded
[ 0.181125] clocksource: Switched to clocksource dmtimer
[ 0.181747] VFS: Disk quotas dquot_6.6.0
[ 0.181808] VFS: Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
[ 0.203539] NET: Registered PF_INET protocol family
[ 0.203877] IP idents hash table entries: 8192 (order: 4, 65536 bytes, linear)
[ 0.205200] tcp_listen_portaddr_hash hash table entries: 512 (order: 0, 4096 bytes, linear)
[ 0.205238] Table-perturb hash table entries: 65536 (order: 6, 262144 bytes, linear)
[ 0.205256] TCP established hash table entries: 4096 (order: 2, 16384 bytes, linear)
[ 0.205298] TCP bind hash table entries: 4096 (order: 4, 65536 bytes, linear)
[ 0.205397] TCP: Hash tables configured (established 4096 bind 4096)
[ 0.205530] UDP hash table entries: 256 (order: 1, 8192 bytes, linear)
[ 0.205558] UDP-Lite hash table entries: 256 (order: 1, 8192 bytes, linear)
[ 0.205730] NET: Registered PF_UNIX/PF_LOCAL protocol family
[ 0.212298] RPC: Registered named UNIX socket transport module.
[ 0.212322] RPC: Registered udp transport module.
[ 0.212327] RPC: Registered tcp transport module.
[ 0.212333] RPC: Registered tcp-with-tls transport module.
[ 0.212338] RPC: Registered tcp NFSv4.1 backchannel transport module.
[ 0.212365] PCI: CLS 0 bytes, default 64
[ 0.213936] Initialise system trusted keyrings
[ 0.221480] workingset: timestamp_bits=14 max_order=17 bucket_order=3
[ 0.222703] NFS: Registering the id_resolver key type
[ 0.222782] Key type id_resolver registered
[ 0.222790] Key type id_legacy registered
[ 0.222843] jffs2: version 2.2. (NAND) (SUMMARY) © 2001-2006 Red Hat, Inc.
[ 0.223253] Key type asymmetric registered
[ 0.223268] Asymmetric key parser ‘x509’ registered
[ 0.223335] io scheduler mq-deadline registered
[ 0.223345] io scheduler kyber registered
[ 0.223412] io scheduler bfq registered
[ 0.249919] Serial: 8250/16550 driver, 6 ports, IRQ sharing enabled
[ 0.305883] brd: module loaded
[ 0.314091] loop: module loaded
[ 0.315014] mtdoops: mtd device (mtddev=name/number) must be supplied
[ 0.317723] i2c_dev: i2c /dev entries driver
[ 0.318561] cpuidle: enable-method property ‘ti,am3352’ found operations
[ 0.318992] sdhci: Secure Digital Host Controller Interface driver
[ 0.319001] sdhci: Copyright(c) Pierre Ossman
[ 0.319172] sdhci-pltfm: SDHCI platform and OF driver helper
[ 0.329786] ledtrig-cpu: registered to indicate activity on CPUs
[ 0.330610] Initializing XFRM netlink socket
[ 0.330766] NET: Registered PF_INET6 protocol family
[ 0.352698] Segment Routing with IPv6
[ 0.352774] In-situ OAM (IOAM) with IPv6
[ 0.352875] sit: IPv6, IPv4 and MPLS over IPv4 tunneling driver
[ 0.353846] NET: Registered PF_PACKET protocol family
[ 0.353874] NET: Registered PF_KEY protocol family
[ 0.353994] Key type dns_resolver registered
[ 0.354217] ThumbEE CPU extension supported.
[ 0.354238] Registering SWP/SWPB emulation handler
[ 0.354683] omap_voltage_late_init: Voltage driver support not added
[ 0.355020] SmartReflex Class3 initialized
[ 0.372679] Loading compiled-in X.509 certificates
[ 0.424539] platform 44e10800.pinmux: Fixed dependency cycle(s) with /ocp/interconnect@44c00000/segment@200000/target-module@10000/scm@0/pinmux@800/clkout2-pins
[ 0.425098] pinctrl-single 44e10800.pinmux: 142 pins, size 568
[ 0.429627] ti-sysc: probe of 44e31000.target-module failed with error -16
[ 0.477058] omap_i2c 4802a000.i2c: bus 1 rev0.11 at 100 kHz
[ 0.481908] ti-sysc: probe of 48040000.target-module failed with error -16
[ 0.520299] OMAP GPIO hardware version 0.1
[ 0.558675] omap_i2c 4819c000.i2c: bus 2 rev0.11 at 100 kHz
[ 0.585234] platform 4830e000.lcdc: Fixed dependency cycle(s) with /ocp/interconnect@44c00000/segment@200000/target-module@b000/i2c@0/tda19988@70
[ 0.596498] sdhci-omap 481d8000.mmc: supply pbias not found, using dummy regulator
[ 0.596988] sdhci-omap 481d8000.mmc: supply vqmmc not found, using dummy regulator
[ 0.683144] davinci_mdio 4a101000.mdio: davinci mdio revision 1.6, bus freq 1000000
[ 0.813916] davinci_mdio 4a101000.mdio: phy[0]: device 4a101000.mdio:00, driver SMSC LAN8710/LAN8720
[ 0.814388] cpsw-switch 4a100000.switch: initialized cpsw ale version 1.4
[ 0.814406] cpsw-switch 4a100000.switch: ALE Table size 1024
[ 0.814537] cpsw-switch 4a100000.switch: cpts: overflow check period 500 (jiffies)
[ 0.814554] cpsw-switch 4a100000.switch: CPTS: ref_clk_freq:250000000 calc_mult:2147483648 calc_shift:29 error:0 nsec/sec
[ 0.814658] cpsw-switch 4a100000.switch: Detected MACID = 64:8c:bb:72:b5:84
[ 0.816443] cpsw-switch 4a100000.switch: initialized (regs 0x4a100000, pool size 256) hw_ver:0019010C 1.12 (0)
[ 0.827077] debugfs: Directory ‘49000000.dma’ with parent ‘dmaengine’ already present!
[ 0.827120] edma 49000000.dma: TI EDMA DMA engine driver
[ 0.891910] hw perfevents: enabled with armv7_cortex_a8 PMU driver, 5 counters available
[ 0.899374] l3-aon-clkctrl:0000:0: failed to disable
[ 0.901760] printk: console [ttyS0] disabled
[ 0.902603] 44e09000.serial: ttyS0 at MMIO 0x44e09000 (irq = 35, base_baud = 3000000) is a 8250
[ 0.902684] printk: console [ttyS0] enabled
[ 2.042020] tps65217-pmic: Failed to locate of_node [id: -1]
[ 2.048056] tps65217-bl: Failed to locate of_node [id: -1]
[ 2.058937] tps65217 0-0024: TPS65217 ID 0xe version 1.2
[ 2.065032] platform 4830e000.lcdc: Fixed dependency cycle(s) with /ocp/interconnect@44c00000/segment@200000/target-module@b000/i2c@0/tda19988@70
[ 2.078446] i2c 0-0070: Fixed dependency cycle(s) with /ocp/interconnect@48000000/segment@300000/target-module@e000/lcdc@0
[ 2.089836] omap_i2c 44e0b000.i2c: bus 0 rev0.11 at 400 kHz
[ 2.097738] omap_gpio 44e07000.gpio: Could not set line 6 debounce to 200000 microseconds (-22)
[ 2.106606] sdhci-omap 48060000.mmc: Got CD GPIO
[ 2.111599] sdhci-omap 48060000.mmc: supply pbias not found, using dummy regulator
[ 2.121711] sdhci-omap 48060000.mmc: supply vqmmc not found, using dummy regulator
[ 2.130324] sdhci-omap 481d8000.mmc: supply pbias not found, using dummy regulator
[ 2.139132] sdhci-omap 481d8000.mmc: supply vqmmc not found, using dummy regulator
[ 2.178417] mmc1: SDHCI controller on 481d8000.mmc [481d8000.mmc] using External DMA
[ 2.187383] mmc0: SDHCI controller on 48060000.mmc [48060000.mmc] using External DMA
[ 2.195726] Trying to probe devices needed for running init …
[ 2.265548] mmc0: new high speed SDXC card at address aaaa
[ 2.272345] mmcblk0: mmc0:aaaa SR64G 59.5 GiB
[ 2.279695] mmcblk0: p1
[ 2.340754] mmc1: new high speed MMC card at address 0001
[ 2.347468] mmcblk1: mmc1:0001 MK2704 3.53 GiB
[ 2.354789] mmcblk1: p1
[ 2.358479] mmcblk1boot0: mmc1:0001 MK2704 2.00 MiB
[ 2.365563] mmcblk1boot1: mmc1:0001 MK2704 2.00 MiB
[ 2.372485] mmcblk1rpmb: mmc1:0001 MK2704 512 KiB, chardev (250:0)
[ 14.721323] clk: Disabling unused clocks
[ 110.562169] VFS: Unable to mount root fs via NFS.
[ 110.567061] devtmpfs: mounted
[ 110.571573] Freeing unused kernel image (initmem) memory: 1024K
[ 110.578148] Run /sbin/init as init process
[ 110.582757] Run /etc/init as init process
[ 110.586989] Run /bin/init as init process
[ 110.591399] Run /bin/sh as init process
[ 110.595434] Kernel panic - not syncing: No working init found. Try passing init= option to kernel. See Linux Documentation/admin-guide/init.rst for guidance.
[ 110.609684] —[ end Kernel panic - not syncing: No working init found. Try passing init= option to kernel. See Linux Documentation/admin-guide/init.rst for guidance. ]—
These are some of the u-boot settings
bootargs=console=ttyS0,115200n8 rootwait root=/dev/nfs ip=192.168.0.100:::::usb0 g_ether.dev_addr=f8:dc:7a:00:00:02 g_ether.host_addr=f8:dc:7a:00:00:01 nfsroot=192.168.0.1:/home/xzsb2/Projects/bootlin/embedded-linux/embedded-linux-bbb-labs/tinysystem/nfsroot,nfsvers=3,tcp rw
ipaddr=192.168.0.100
serverip=192.168.0.1
bootcmd=tftp 0x81000000 zImage; sleep 0.1; tftp 0x82000000 am335x-boneblack.dtb; bootz 0x81000000 - 0x82000000
usbnet_devaddr=f8:dc:7a:00:00:02
usbnet_hostaddr=f8:dc:7a:00:00:01
/etc/exports
/home/xzsb2/Projects/bootlin/embedded-linux/embedded-linux-bbb-labs/tinysystem/nfsroot 192.168.0.100(rw,async,no_root_squash,no_subtree_check)
nfs-server and tftpd are enabled and started.
(nfs-server shows up as active (exited))
tftpd loads the kernel image correctly and the .dtb file but not NFS.
Any help appreciated…