Hello,
I tried to create an OpenWrt build for Beaglebone black that can boot from NFS server. I can confirm NFS server is up and running by having a stock Debian firmware boot NFS from it.
The issue I seem to be having is the kernel tried to boot NFS before the Ethernet eth0 is up.
Could you please provide some guidance ?
I have tried different variant of bootargs below, all were unsuccessful:
Bootargs
console=ttyO0,115200n8 root=/dev/nfs rw rootfstype=ext4 rootwait fixrtc nfsroot=192.168.3.132:/mnt/nfs_bbb,nfsvers=4,tcp ip=192.168.3.150:192.168.3.132:192.168.3.1:255.255.255.0::eth0:off earlyprintk nfsrootdebug
vers=3,tcp
Kernel config
CONFIG_KERNFS=y
CONFIG_NFS_FS=y
CONFIG_NFS_V2=y
CONFIG_NFS_V3=y
CONFIG_NFS_V3_ACL=y
CONFIG_NFS_V4=y
CONFIG_NFS_SWAP=y
CONFIG_NFS_V4_1=y
CONFIG_NFS_V4_2=y
CONFIG_PNFS_FILE_LAYOUT=y
CONFIG_PNFS_FLEXFILE_LAYOUT=m
CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN="kernel.org"
CONFIG_NFS_V4_1_MIGRATION=y
CONFIG_NFS_USE_LEGACY_DNS=y
CONFIG_NFS_DEBUG=y
CONFIG_NFSD=y
CONFIG_NFSD_V2_ACL=y
CONFIG_NFSD_V3=y
CONFIG_NFSD_V3_ACL=y
CONFIG_NFSD_V4=y
CONFIG_NFSD_PNFS=y
CONFIG_NFSD_BLOCKLAYOUT=y
CONFIG_NFSD_SCSILAYOUT=y
CONFIG_NFSD_FLEXFILELAYOUT=y
CONFIG_NFSD_FAULT_INJECTION=y
CONFIG_NFS_ACL_SUPPORT=y
CONFIG_NFS_COMMON=y
Kernel boot log
TFTP from server 192.168.3.132; our IP address is 192.168.3.150
Filename 'zImage'.
Load address: 0x82000000
Loading: #################################################################
#################################################################
#################################################################
##############################################################
2.3 MiB/s
done
Bytes transferred = 3767304 (397c08 hex)
link up on port 0, speed 100, full duplex
Using cpsw device
TFTP from server 192.168.3.132; our IP address is 192.168.3.150
Filename 'dtbs/am335x-boneblack.dtb'.
Load address: 0x88000000
Loading: ###
2.2 MiB/s
done
Bytes transferred = 34782 (87de hex)
## Flattened Device Tree blob at 88000000
Booting using the fdt blob at 0x88000000
Loading Device Tree to 8fff4000, end 8ffff7dd ... OK
Starting kernel ...
[ 0.000000] Booting Linux on physical CPU 0x0
[ 0.000000] Linux version 4.19.108 (dev@dell) (gcc version 8.4.0 (OpenWrt GCC 8.4.0 r12992-165e442571)) #0 SMP Sat Apr 18 03:07:20 2020
[ 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 0x9ec00000
[ 0.000000] CPU: All CPU(s) started in SVC mode.
[ 0.000000] AM335X ES2.1 (sgx neon)
[ 0.000000] random: get_random_bytes called from start_kernel+0x84/0x440 with crng_init=0
[ 0.000000] percpu: Embedded 15 pages/cpu s30732 r8192 d22516 u61440
[ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 129412
[ 0.000000] Kernel command line: console=ttyO0,115200n8 root=/dev/nfs rw rootfstype=ext4 rootwait fixrtc nfsroot=192.168.3.132:/mnt/nfs_bbb,nfsvers=4,tcp ip=192.168.3.150:192.168.3.132:192.168.3.1:255.255.255.0::eth0:off earlyprintk nfsrootdebug
[ 0.000000] Dentry cache hash table entries: 65536 (order: 6, 262144 bytes)
[ 0.000000] Inode-cache hash table entries: 32768 (order: 5, 131072 bytes)
[ 0.000000] Memory: 487668K/522240K available (8248K kernel code, 333K rwdata, 2420K rodata, 1024K init, 307K bss, 18188K reserved, 16384K cma-reserved, 0K highmem)
[ 0.000000] Virtual kernel memory layout:
[ 0.000000] vector : 0xffff0000 - 0xffff1000 ( 4 kB)
[ 0.000000] fixmap : 0xffc00000 - 0xfff00000 (3072 kB)
[ 0.000000] vmalloc : 0xe0000000 - 0xff800000 ( 504 MB)
[ 0.000000] lowmem : 0xc0000000 - 0xdfe00000 ( 510 MB)
[ 0.000000] pkmap : 0xbfe00000 - 0xc0000000 ( 2 MB)
[ 0.000000] modules : 0xbf000000 - 0xbfe00000 ( 14 MB)
[ 0.000000] .text : 0x(ptrval) - 0x(ptrval) (9241 kB)
[ 0.000000] .init : 0x(ptrval) - 0x(ptrval) (1024 kB)
[ 0.000000] .data : 0x(ptrval) - 0x(ptrval) ( 334 kB)
[ 0.000000] .bss : 0x(ptrval) - 0x(ptrval) ( 308 kB)
[ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[ 0.000000] rcu: Hierarchical RCU implementation.
[ 0.000000] rcu: RCU restricting CPUs from NR_CPUS=4 to nr_cpu_ids=1.
[ 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] OMAP clockevent source: timer2 at 24000000 Hz
[ 0.000015] sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 89478484971ns
[ 0.000036] clocksource: timer1: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 79635851949 ns
[ 0.000048] OMAP clocksource: timer1 at 24000000 Hz
[ 0.000418] timer_probe: no matching timers found
[ 0.000480] Calibrating delay loop... 996.14 BogoMIPS (lpj=4980736)
[ 0.089122] pid_max: default: 32768 minimum: 301
[ 0.089317] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.089332] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.090177] CPU: Testing write buffer coherency: ok
[ 0.090245] CPU0: Spectre v2: using BPIALL workaround
[ 0.090653] CPU0: thread -1, cpu 0, socket -1, mpidr 0
[ 0.091337] Setting up static identity map for 0x80100000 - 0x80100060
[ 0.091509] rcu: Hierarchical SRCU implementation.
[ 0.092062] smp: Bringing up secondary CPUs ...
[ 0.092078] smp: Brought up 1 node, 1 CPU
[ 0.092088] SMP: Total of 1 processors activated (996.14 BogoMIPS).
[ 0.092096] CPU: All CPU(s) started in SVC mode.
[ 0.100705] VFP support v0.3: implementor 41 architecture 3 part 30 variant c rev 3
[ 0.100974] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[ 0.101003] futex hash table entries: 256 (order: 2, 16384 bytes)
[ 0.102162] pinctrl core: initialized pinctrl subsystem
[ 0.103624] NET: Registered protocol family 16
[ 0.106304] DMA: preallocated 256 KiB pool for atomic coherent allocations
[ 0.131874] l4_wkup_cm:clk:0010:0: failed to disable
[ 0.171979] audit: initializing netlink subsys (disabled)
[ 0.173188] cpuidle: using governor ladder
[ 0.173205] cpuidle: using governor menu
[ 0.178747] OMAP GPIO hardware version 0.1
[ 0.185777] audit: type=2000 audit(0.170:1): state=initialized audit_enabled=0 res=1
[ 0.235235] edma 49000000.edma: TI EDMA DMA engine driver
[ 0.238945] SCSI subsystem initialized
[ 0.252453] usbcore: registered new interface driver usbfs
[ 0.252531] usbcore: registered new interface driver hub
[ 0.252626] usbcore: registered new device driver usb
[ 0.253313] pps_core: LinuxPPS API ver. 1 registered
[ 0.253326] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
[ 0.253354] PTP clock support registered
[ 0.253614] Advanced Linux Sound Architecture Driver Initialized.
[ 0.258382] clocksource: Switched to clocksource timer1
[ 0.258629] VFS: Disk quotas dquot_6.6.0
[ 0.258707] VFS: Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
[ 0.259910] NET: Registered protocol family 2
[ 0.260590] tcp_listen_portaddr_hash hash table entries: 512 (order: 0, 6144 bytes)
[ 0.260627] TCP established hash table entries: 4096 (order: 2, 16384 bytes)
[ 0.260671] TCP bind hash table entries: 4096 (order: 3, 32768 bytes)
[ 0.260732] TCP: Hash tables configured (established 4096 bind 4096)
[ 0.260836] UDP hash table entries: 256 (order: 1, 8192 bytes)
[ 0.260861] UDP-Lite hash table entries: 256 (order: 1, 8192 bytes)
[ 0.261064] NET: Registered protocol family 1
[ 0.264515] RPC: Registered named UNIX socket transport module.
[ 0.264539] RPC: Registered udp transport module.
[ 0.264547] RPC: Registered tcp transport module.
[ 0.264554] RPC: Registered tcp NFSv4.1 backchannel transport module.
[ 0.266745] No memory allocated for crashlog
[ 0.267848] workingset: timestamp_bits=14 max_order=17 bucket_order=3
[ 0.278392] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[ 0.284974] NFS: Registering the id_resolver key type
[ 0.285028] Key type id_resolver registered
[ 0.285038] Key type id_legacy registered
[ 0.285059] nfs4filelayout_init: NFSv4 File Layout Driver Registering...
[ 0.285069] Installing knfsd (copyright (C) 1996 okir@monad.swb.de).
[ 0.288360] jffs2: version 2.2 (NAND) (SUMMARY) (LZO) (LZMA) (RTIME) (RUBIN) (CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc.
[ 0.297581] io scheduler noop registered
[ 0.297605] io scheduler deadline registered (default)
[ 0.299702] pinctrl-single 44e10800.pinmux: 142 pins, size 568
[ 0.302040] Serial: 8250/16550 driver, 2 ports, IRQ sharing enabled
[ 0.303206] omap_uart 44e09000.serial: no wakeirq for uart0
[ 0.303267] 44e09000.serial: ttyO0 at MMIO 0x44e09000 (irq = 30, base_baud = 3000000) is a OMAP UART0
[ 0.960342] console [ttyO0] enabled
[ 0.984258] brd: module loaded
[ 0.991653] loop: module loaded
[ 0.996229] mtdoops: mtd device (mtddev=name/number) must be supplied
[ 1.004331] libphy: Fixed MDIO Bus: probed
[ 1.078325] davinci_mdio 4a101000.mdio: davinci mdio revision 1.6, bus freq 1000000
[ 1.086360] davinci_mdio 4a101000.mdio: detected phy mask fffffffe
[ 1.093996] libphy: 4a101000.mdio: probed
[ 1.098290] davinci_mdio 4a101000.mdio: phy[0]: device 4a101000.mdio:00, driver SMSC LAN8710/LAN8720
[ 1.108743] cpsw 4a100000.ethernet: Detected MACID = 6c:ec:eb:ac:60:8c
[ 1.116516] cpsw 4a100000.ethernet: initialized cpsw ale version 1.4
[ 1.123270] cpsw 4a100000.ethernet: ALE Table size 1024
[ 1.128819] cpsw 4a100000.ethernet: cpts: overflow check period 500 (jiffies)
[ 1.138570] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[ 1.145413] ehci-omap: OMAP-EHCI Host Controller driver
[ 1.153153] am335x-phy-driver 47401300.usb-phy: 47401300.usb-phy supply vcc not found, using dummy regulator
[ 1.163698] am335x-phy-driver 47401300.usb-phy: Linked as a consumer to regulator.0
[ 1.173384] am335x-phy-driver 47401b00.usb-phy: 47401b00.usb-phy supply vcc not found, using dummy regulator
[ 1.183881] am335x-phy-driver 47401b00.usb-phy: Linked as a consumer to regulator.0
[ 1.205953] omap_rtc 44e3e000.rtc: registered as rtc0
[ 1.211956] i2c /dev entries driver
[ 1.216838] omap_wdt: OMAP Watchdog Timer Rev 0x01: initial timeout 60 sec
[ 1.226303] omap_gpio 44e07000.gpio: Could not set line 6 debounce to 200000 microseconds (-22)
[ 1.235496] omap_hsmmc 48060000.mmc: Got CD GPIO
[ 1.240825] omap_hsmmc 48060000.mmc: Linked as a consumer to regulator.1
[ 1.273231] omap_hsmmc 481d8000.mmc: Linked as a consumer to regulator.1
[ 1.307291] ledtrig-cpu: registered to indicate activity on CPUs
[ 1.314170] omap-aes 53500000.aes: OMAP AES hw accel rev: 3.2
[ 1.320699] omap-aes 53500000.aes: will run requests pump with realtime priority
[ 1.330394] omap-sham 53100000.sham: hw accel on OMAP rev 4.3
[ 1.349084] NET: Registered protocol family 10
[ 1.355567] mmc0: host does not support reading read-only switch, assuming write-enable
[ 1.366057] Segment Routing with IPv6
[ 1.370174] NET: Registered protocol family 17
[ 1.374847] NET: Registered protocol family 15
[ 1.379725] 8021q: 802.1Q VLAN Support v1.8
[ 1.384151] Key type dns_resolver registered
[ 1.388879] ThumbEE CPU extension supported.
[ 1.393355] Registering SWP/SWPB emulation handler
[ 1.398395] omap_voltage_late_init: Voltage driver support not added
[ 1.405052] sr_dev_init: Unknown instance smartreflex0
[ 1.410786] SmartReflex Class3 initialized
[ 1.416615] mmc0: new high speed SDHC card at address aaaa
[ 1.424320] mmcblk0: mmc0:aaaa SC16G 14.8 GiB
[ 1.444416] mmcblk0: p1
[ 1.465623] mmc1: new high speed MMC card at address 0001
[ 1.472559] mmcblk1: mmc1:0001 MMC04G 3.60 GiB
[ 1.477594] mmcblk1boot0: mmc1:0001 MMC04G partition 1 2.00 MiB
[ 1.484205] mmcblk1boot1: mmc1:0001 MMC04G partition 2 2.00 MiB
[ 1.490595] mmcblk1rpmb: mmc1:0001 MMC04G partition 3 128 KiB, chardev (247:0)
[ 1.500360] random: fast init done
[ 1.504729] mmcblk1: p1
[ 1.521908] tps65217 0-0024: TPS65217 ID 0xe version 1.2
[ 1.528024] omap_i2c 44e0b000.i2c: bus 0 rev0.11 at 400 kHz
[ 1.536747] omap_i2c 4819c000.i2c: bus 2 rev0.11 at 100 kHz
[ 1.552405] musb-hdrc musb-hdrc.1: MUSB HDRC host driver
[ 1.558021] musb-hdrc musb-hdrc.1: new USB bus registered, assigned bus number 1
[ 1.567618] hub 1-0:1.0: USB hub found
[ 1.572116] hub 1-0:1.0: 1 port detected
[ 1.577725] cpu cpu0: Linked as a consumer to regulator.3
[ 1.583950] cpu cpu0: Dropping the link to regulator.3
[ 1.589966] cpu cpu0: Linked as a consumer to regulator.3
[ 1.598978] omap_rtc 44e3e000.rtc: setting system clock to 2000-01-01 00:00:00 UTC (946684800)
[ 1.608013] sr_init: No PMIC hook to init smartreflex
[ 1.614615] ALSA device list:
[ 1.617728] No soundcards found.
[ 1.623342] VFS: Cannot open root device "nfs" or unknown-block(0,255): error -6
[ 1.631282] Please append a correct "root=" boot option; here are the available partitions:
[ 1.640063] 0100 16384 ram0
[ 1.640067] (driver?)
[ 1.646449] 0101 16384 ram1
[ 1.646452] (driver?)
[ 1.652855] 0102 16384 ram2
[ 1.652858] (driver?)
[ 1.659258] 0103 16384 ram3
[ 1.659260] (driver?)
[ 1.665642] 0104 16384 ram4
[ 1.665644] (driver?)
[ 1.672043] 0105 16384 ram5
[ 1.672045] (driver?)
[ 1.678441] 0106 16384 ram6
[ 1.678444] (driver?)
[ 1.684824] 0107 16384 ram7
[ 1.684826] (driver?)
[ 1.691225] 0108 16384 ram8
[ 1.691227] (driver?)
[ 1.697608] 0109 16384 ram9
[ 1.697611] (driver?)
[ 1.704009] 010a 16384 ram10
[ 1.704011] (driver?)
[ 1.710499] 010b 16384 ram11
[ 1.710502] (driver?)
[ 1.716974] 010c 16384 ram12
[ 1.716977] (driver?)
[ 1.723466] 010d 16384 ram13
[ 1.723468] (driver?)
[ 1.729958] 010e 16384 ram14
[ 1.729960] (driver?)
[ 1.736433] 010f 16384 ram15
[ 1.736435] (driver?)
[ 1.742935] b300 15558144 mmcblk0
[ 1.742939] driver: mmcblk
[ 1.750065] b301 3682304 mmcblk0p1 3244345d-01
[ 1.750068]
[ 1.757175] b308 3776512 mmcblk1
[ 1.757178] driver: mmcblk
[ 1.764304] b309 3772416 mmcblk1p1 3b28ed17-01
[ 1.764306]
[ 1.771435] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,255)
[ 1.780273] Rebooting in 1 seconds..
