选定的处理器在 ARM 模式下不支持“dmb ish" [英] Selected processor does not support `dmb ish' in ARM mode
本文介绍了选定的处理器在 ARM 模式下不支持“dmb ish"的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在使用 crosstool-NG、U-Boot、Kernel (5.5.5) 和 buildroot 在 Beaglebone Black(AM335x 芯片 Cortex-A8 Arm-v7 指令集)上构建嵌入式 linux 发行版.编译内核时，我收到此错误消息:
I am building an embedded linux distro on a Beaglebone Black (AM335x chip Cortex-A8 Arm-v7 Instruction set) using crosstool-NG, U-Boot, Kernel (5.5.5) and buildroot. When compiling the kernel I am getting this error message:
/tmp/ccxFZlyN.s: Assembler messages:
/tmp/ccxFZlyN.s:39: Error: selected processor does not support `isb ' in ARM mode
/tmp/ccxFZlyN.s:90: Error: selected processor does not support `isb ' in ARM mode
/tmp/ccxFZlyN.s:371: Error: selected processor does not support `isb ' in ARM mode
scripts/Makefile.build:265: recipe for target 'arch/arm/vfp/vfpmodule.o' failed
make[1]: *** [arch/arm/vfp/vfpmodule.o] Error 1
Makefile:1693: recipe for target 'arch/arm/vfp' failed
make: *** [arch/arm/vfp] Error 2
make: *** Waiting for unfinished jobs....
CC init/do_mounts_rd.o
CC init/do_mounts_initrd.o
/tmp/ccg2MH8t.s: Assembler messages:
/tmp/ccg2MH8t.s:275: Error: selected processor does not support `dmb ish' in ARM mode
/tmp/ccg2MH8t.s:278: Error: architectural extension `mp' is not allowed for the current base architecture
/tmp/ccg2MH8t.s:279: Error: selected processor does not support `pldw [r3]' in ARM mode
/tmp/ccg2MH8t.s:282: Error: selected processor does not support `pld [r3]' in ARM mode
/tmp/ccg2MH8t.s:288: Error: selected processor does not support `ldrex r2,[r3]' in ARM mode
/tmp/ccg2MH8t.s:290: Error: selected processor does not support `strex r1,r2,[r3]' in ARM mode
/tmp/ccg2MH8t.s:295: Error: selected processor does not support `dmb ish' in ARM mode
scripts/Makefile.build:265: recipe for target 'init/do_mounts.o' failed
make[1]: *** [init/do_mounts.o] Error 1
make[1]: *** Waiting for unfinished jobs....
/tmp/ccFNavBu.s: Assembler messages:
/tmp/ccFNavBu.s:1990: Error: selected processor does not support `cpsid i' in ARM mode
/tmp/ccFNavBu.s:2123: Error: selected processor does not support `cpsid i' in ARM mode
/tmp/ccFNavBu.s:2204: Error: selected processor does not support `cpsie i' in ARM mode
/tmp/ccFNavBu.s:2426: Error: selected processor does not support `cpsie i' in ARM mode
scripts/Makefile.build:265: recipe for target 'init/main.o' failed
这是我的工具链:
arm-cortex_a8-linux-gnueabihf-gcc -v
Using built-in specs.
COLLECT_GCC=arm-cortex_a8-linux-gnueabihf-gcc
COLLECT_LTO_WRAPPER=/home/john/x-tools/arm-cortex_a8-linux-gnueabihf/libexec/gcc/arm-cortex_a8-linux-gnueabihf/9.2.0/lto-wrapper
Target: arm-cortex_a8-linux-gnueabihf
Configured with: /home/john/Documents/crosstool-ng/.build/arm-cortex_a8-linux-gnueabihf/src/gcc/configure --build=x86_64-build_pc-linux-gnu --host=x86_64-build_pc-linux-gnu --target=arm-cortex_a8-linux-gnueabihf --prefix=/home/john/x-tools/arm-cortex_a8-linux-gnueabihf --with-sysroot=/home/john/x-tools/arm-cortex_a8-linux-gnueabihf/arm-cortex_a8-linux-gnueabihf/sysroot --enable-languages=c,c++ --with-cpu=cortex-a8 --with-float=hard --with-pkgversion='crosstool-NG 1.24.0.105_5659366' --enable-__cxa_atexit --disable-libmudflap --disable-libgomp --disable-libssp --disable-libquadmath --disable-libquadmath-support --disable-libsanitizer --disable-libmpx --with-gmp=/home/john/Documents/crosstool-ng/.build/arm-cortex_a8-linux-gnueabihf/buildtools --with-mpfr=/home/john/Documents/crosstool-ng/.build/arm-cortex_a8-linux-gnueabihf/buildtools --with-mpc=/home/john/Documents/crosstool-ng/.build/arm-cortex_a8-linux-gnueabihf/buildtools --with-isl=/home/john/Documents/crosstool-ng/.build/arm-cortex_a8-linux-gnueabihf/buildtools --enable-lto --with-host-libstdcxx='-static-libgcc -Wl,-Bstatic,-lstdc++,-Bdynamic -lm' --enable-threads=posix --enable-target-optspace --enable-plugin --enable-gold --disable-nls --disable-multilib --with-local-prefix=/home/john/x-tools/arm-cortex_a8-linux-gnueabihf/arm-cortex_a8-linux-gnueabihf/sysroot --enable-long-long
Thread model: posix
gcc version 9.2.0 (crosstool-NG 1.24.0.105_5659366)
这是我的完整引导日志:
Here is my full bootlog:
U-Boot 2020.04 (Jun 11 2020 - 15:14:20 +0100)
CPU : AM335X-GP rev 2.1
Model: TI AM335x BeagleBone Black
DRAM: 512 MiB
WDT: Started with servicing (60s timeout)
NAND: 0 MiB
MMC: OMAP SD/MMC: 0, OMAP SD/MMC: 1
Loading Environment from FAT... OK
Net: eth0: ethernet@4a100000
Warning: usb_ether MAC addresses don't match:
Address in ROM is de:ad:be:ef:00:01
Address in environment is 0c:ae:7d:0c:4f:f4
, eth1: usb_ether
Hit any key to stop autoboot: 0
switch to partitions #0, OK
mmc0 is current device
SD/MMC found on device 0
475 bytes read in 3 ms (154.3 KiB/s)
Loaded env from uEnv.txt
Importing environment from mmc0 ...
Running uenvcmd ...
7995904 bytes read in 515 ms (14.8 MiB/s)
33325 bytes read in 6 ms (5.3 MiB/s)
## Flattened Device Tree blob at 80f80000
Booting using the fdt blob at 0x80f80000
Loading Device Tree to 8fff4000, end 8ffff22c ... OK
Starting kernel ...
[ 0.000000] Booting Linux on physical CPU 0x0
[ 0.000000] Linux version 5.5.5-john (john@homepc) (gcc version 9.2.0 (crosstool-NG 1.24.0.105_5659366)) #1 SMP Thu Jun 11 13:29:44 BST 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] efi: Getting EFI parameters from FDT:
[ 0.000000] efi: UEFI not found.
[ 0.000000] cma: Reserved 64 MiB at 0x9b800000
[ 0.000000] CPU: All CPU(s) started in SVC mode.
[ 0.000000] AM335X ES2.1 (sgx neon)
[ 0.000000] percpu: Embedded 19 pages/cpu s48908 r8192 d20724 u77824
[ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 129540
[ 0.000000] Kernel command line: console=ttyO0,115200 root=/dev/mmcblk0p2 rootfstype=ext4
[ 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] mem auto-init: stack:off, heap alloc:off, heap free:off
[ 0.000000] Memory: 432996K/522240K available (11264K kernel code, 1131K rwdata, 4240K rodata, 1024K init, 306K bss, 23708K reserved, 65536K cma-reserved, 0K highmem)
[ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[ 0.000000] rcu: Hierarchical RCU implementation.
[ 0.000000] rcu: RCU event tracing is enabled.
[ 0.000000] rcu: RCU restricting CPUs from NR_CPUS=16 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] random: get_random_bytes called from start_kernel+0x314/0x4c0 with crng_init=0
[ 0.000000] OMAP clockevent source: timer2 at 24000000 Hz
[ 0.000015] sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 89478484971ns
[ 0.000034] clocksource: timer1: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 79635851949 ns
[ 0.000044] OMAP clocksource: timer1 at 24000000 Hz
[ 0.001702] timer_probe: no matching timers found
[ 0.001897] Console: colour dummy device 80x30
[ 0.001923] WARNING: Your 'console=ttyO0' has been replaced by 'ttyS0'
[ 0.001930] This ensures that you still see kernel messages. Please
[ 0.001935] update your kernel commandline.
[ 0.001974] Calibrating delay loop... 996.14 BogoMIPS (lpj=4980736)
[ 0.089197] pid_max: default: 32768 minimum: 301
[ 0.089352] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
[ 0.089367] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
[ 0.090125] CPU: Testing write buffer coherency: ok
[ 0.090197] CPU0: Spectre v2: using BPIALL workaround
[ 0.090576] CPU0: thread -1, cpu 0, socket -1, mpidr 0
[ 0.091191] Setting up static identity map for 0x80300000 - 0x803000ac
[ 0.091613] rcu: Hierarchical SRCU implementation.
[ 0.094062] EFI services will not be available.
[ 0.094229] smp: Bringing up secondary CPUs ...
[ 0.094242] smp: Brought up 1 node, 1 CPU
[ 0.094252] SMP: Total of 1 processors activated (996.14 BogoMIPS).
[ 0.094259] CPU: All CPU(s) started in SVC mode.
[ 0.094791] devtmpfs: initialized
[ 0.101284] VFP support v0.3: implementor 41 architecture 3 part 30 variant c rev 3
[ 0.101581] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[ 0.101610] futex hash table entries: 256 (order: 2, 16384 bytes, linear)
[ 0.105563] pinctrl core: initialized pinctrl subsystem
[ 0.107106] thermal_sys: Registered thermal governor 'step_wise'
[ 0.107372] DMI not present or invalid.
[ 0.107846] NET: Registered protocol family 16
[ 0.110311] DMA: preallocated 256 KiB pool for atomic coherent allocations
[ 0.132055] l4_wkup_cm:clk:0010:0: failed to disable
[ 0.134222] cpuidle: using governor menu
[ 0.140353] platform 44e07000.gpio: Cannot lookup hwmod 'gpio1'
[ 0.140559] omap_gpio 44e07000.gpio: Could not get gpio dbck. Disable debounce
[ 0.140581] omap_gpio 44e07000.gpio: _od_fail_runtime_resume: FIXME: missing hwmod/omap_dev info
[ 0.141005] OMAP GPIO hardware version 0.1
[ 0.141300] platform 4804c000.gpio: Cannot lookup hwmod 'gpio2'
[ 0.141513] omap_gpio 4804c000.gpio: Could not get gpio dbck. Disable debounce
[ 0.141531] omap_gpio 4804c000.gpio: _od_fail_runtime_resume: FIXME: missing hwmod/omap_dev info
[ 0.142104] platform 481ac000.gpio: Cannot lookup hwmod 'gpio3'
[ 0.142308] omap_gpio 481ac000.gpio: Could not get gpio dbck. Disable debounce
[ 0.142326] omap_gpio 481ac000.gpio: _od_fail_runtime_resume: FIXME: missing hwmod/omap_dev info
[ 0.142870] platform 481ae000.gpio: Cannot lookup hwmod 'gpio4'
[ 0.143060] omap_gpio 481ae000.gpio: Could not get gpio dbck. Disable debounce
[ 0.143075] omap_gpio 481ae000.gpio: _od_fail_runtime_resume: FIXME: missing hwmod/omap_dev info
[ 0.143603] platform 44e09000.serial: Cannot lookup hwmod 'uart1'
[ 0.144022] platform 44e0b000.i2c: Cannot lookup hwmod 'i2c1'
[ 0.144318] platform 4819c000.i2c: Cannot lookup hwmod 'i2c3'
[ 0.144581] platform 48060000.mmc: Cannot lookup hwmod 'mmc1'
[ 0.144843] platform 481d8000.mmc: Cannot lookup hwmod 'mmc2'
[ 0.145407] platform 44e35000.wdt: Cannot lookup hwmod 'wd_timer2'
[ 0.145706] platform 480c8000.mailbox: Cannot lookup hwmod 'mailbox'
[ 0.147736] platform 47400000.usb: Cannot lookup hwmod 'usb_otg_hs'
[ 0.148253] platform 4a100000.ethernet: Cannot lookup hwmod 'cpgmac0'
[ 0.150389] platform 48310000.rng: Cannot lookup hwmod 'rng'
[ 0.151017] No ATAGs?
[ 0.151024] hw-breakpoint: debug architecture 0x4 unsupported.
[ 0.153962] Serial: AMBA PL011 UART driver
[ 0.173976] edma 49000000.edma: TI EDMA DMA engine driver
[ 0.177034] iommu: Default domain type: Translated
[ 0.177379] vgaarb: loaded
[ 0.178274] SCSI subsystem initialized
[ 0.178877] usbcore: registered new interface driver usbfs
[ 0.178928] usbcore: registered new interface driver hub
[ 0.178986] usbcore: registered new device driver usb
[ 0.180177] pps_core: LinuxPPS API ver. 1 registered
[ 0.180191] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
[ 0.180213] PTP clock support registered
[ 0.180374] EDAC MC: Ver: 3.0.0
[ 0.183425] clocksource: Switched to clocksource timer1
[ 0.760718] NET: Registered protocol family 2
[ 0.761388] tcp_listen_portaddr_hash hash table entries: 512 (order: 0, 6144 bytes, linear)
[ 0.761416] TCP established hash table entries: 4096 (order: 2, 16384 bytes, linear)
[ 0.761458] TCP bind hash table entries: 4096 (order: 3, 32768 bytes, linear)
[ 0.761517] TCP: Hash tables configured (established 4096 bind 4096)
[ 0.761633] UDP hash table entries: 256 (order: 1, 8192 bytes, linear)
[ 0.761659] UDP-Lite hash table entries: 256 (order: 1, 8192 bytes, linear)
[ 0.761799] NET: Registered protocol family 1
[ 0.762495] RPC: Registered named UNIX socket transport module.
[ 0.762508] RPC: Registered udp transport module.
[ 0.762515] RPC: Registered tcp transport module.
[ 0.762521] RPC: Registered tcp NFSv4.1 backchannel transport module.
[ 0.762535] PCI: CLS 0 bytes, default 64
[ 0.763813] hw perfevents: enabled with armv7_cortex_a8 PMU driver, 5 counters available
[ 0.765384] Initialise system trusted keyrings
[ 0.765727] workingset: timestamp_bits=30 max_order=17 bucket_order=0
[ 0.771682] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[ 0.772630] NFS: Registering the id_resolver key type
[ 0.772677] Key type id_resolver registered
[ 0.772685] Key type id_legacy registered
[ 0.772730] ntfs: driver 2.1.32 [Flags: R/O].
[ 0.773274] Key type asymmetric registered
[ 0.773285] Asymmetric key parser 'x509' registered
[ 0.773342] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 248)
[ 0.773353] io scheduler mq-deadline registered
[ 0.773360] io scheduler kyber registered
[ 0.776728] pinctrl-single 44e10800.pinmux: 142 pins, size 568
[ 0.832881] Serial: 8250/16550 driver, 5 ports, IRQ sharing enabled
[ 0.835861] omap8250 44e09000.serial: _od_fail_runtime_resume: FIXME: missing hwmod/omap_dev info
[ 0.836680] 44e09000.serial: ttyS0 at MMIO 0x44e09000 (irq = 30, base_baud = 3000000) is a 8250
[ 1.608905] printk: console [ttyS0] enabled
[ 1.614361] SuperH (H)SCI(F) driver initialized
[ 1.619312] msm_serial: driver initialized
[ 1.623670] STMicroelectronics ASC driver initialized
[ 1.629822] STM32 USART driver initialized
[ 1.634758] omap_rng 48310000.rng: _od_fail_runtime_resume: FIXME: missing hwmod/omap_dev info
[ 1.643478] omap_rng 48310000.rng: Failed to runtime_get device: -19
[ 1.649861] omap_rng 48310000.rng: initialization failed.
[ 1.668610] brd: module loaded
[ 1.679286] loop: module loaded
[ 1.688192] libphy: Fixed MDIO Bus: probed
[ 1.693549] CAN device driver interface
[ 1.698157] e1000e: Intel(R) PRO/1000 Network Driver - 3.2.6-k
[ 1.704072] e1000e: Copyright(c) 1999 - 2015 Intel Corporation.
[ 1.725075] cpsw 4a100000.ethernet: _od_fail_runtime_resume: FIXME: missing hwmod/omap_dev info
[ 1.734257] pegasus: v0.9.3 (2013/04/25), Pegasus/Pegasus II USB Ethernet driver
[ 1.741748] usbcore: registered new interface driver pegasus
[ 1.747522] usbcore: registered new interface driver asix
[ 1.752974] usbcore: registered new interface driver ax88179_178a
[ 1.759153] usbcore: registered new interface driver cdc_ether
[ 1.765082] usbcore: registered new interface driver smsc75xx
[ 1.770893] usbcore: registered new interface driver smsc95xx
[ 1.776715] usbcore: registered new interface driver net1080
[ 1.782424] usbcore: registered new interface driver cdc_subset
[ 1.788416] usbcore: registered new interface driver zaurus
[ 1.794079] usbcore: registered new interface driver cdc_ncm
[ 1.801423] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[ 1.808049] ehci-pci: EHCI PCI platform driver
[ 1.812558] ehci-platform: EHCI generic platform driver
[ 1.818008] ehci-st: EHCI STMicroelectronics driver
[ 1.823011] tegra-ehci: Tegra EHCI driver
[ 1.827199] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[ 1.833472] ohci-pci: OHCI PCI platform driver
[ 1.837984] ohci-platform: OHCI generic platform driver
[ 1.843427] ohci-st: OHCI STMicroelectronics driver
[ 1.848834] usbcore: registered new interface driver usb-storage
[ 1.857926] i2c /dev entries driver
[ 1.867206] sdhci: Secure Digital Host Controller Interface driver
[ 1.873499] sdhci: Copyright(c) Pierre Ossman
[ 1.878477] omap_gpio 44e07000.gpio: Could not set line 6 debounce to 200000 microseconds (-524)
[ 1.887371] omap_hsmmc 48060000.mmc: Got CD GPIO
[ 1.892220] omap_hsmmc: probe of 48060000.mmc failed with error -2
[ 1.898768] omap_hsmmc: probe of 481d8000.mmc failed with error -2
[ 1.905886] Synopsys Designware Multimedia Card Interface Driver
[ 1.912404] sdhci-pltfm: SDHCI platform and OF driver helper
[ 1.920105] ledtrig-cpu: registered to indicate activity on CPUs
[ 1.927530] usbcore: registered new interface driver usbhid
[ 1.933134] usbhid: USB HID core driver
[ 1.938468] drop_monitor: Initializing network drop monitor service
[ 1.945737] NET: Registered protocol family 10
[ 1.951373] Segment Routing with IPv6
[ 1.955262] sit: IPv6, IPv4 and MPLS over IPv4 tunneling driver
[ 1.961939] NET: Registered protocol family 17
[ 1.966492] can: controller area network core (rev 20170425 abi 9)
[ 1.972784] NET: Registered protocol family 29
[ 1.977277] can: raw protocol (rev 20170425)
[ 1.981566] can: broadcast manager protocol (rev 20170425 t)
[ 1.987274] can: netlink gateway (rev 20190810) max_hops=1
[ 1.993306] Key type dns_resolver registered
[ 1.997802] ThumbEE CPU extension supported.
[ 2.002106] Registering SWP/SWPB emulation handler
[ 2.007212] omap_voltage_late_init: Voltage driver support not added
[ 2.014818] Loading compiled-in X.509 certificates
[ 2.034806] omap_i2c 44e0b000.i2c: _od_fail_runtime_resume: FIXME: missing hwmod/omap_dev info
[ 2.045484] omap_i2c 4819c000.i2c: _od_fail_runtime_resume: FIXME: missing hwmod/omap_dev info
[ 2.056304] hctosys: unable to open rtc device (rtc0)
[ 2.066764] l4_per_cm:clk:0008:0: failed to disable
[ 2.076823] l4_wkup_cm:clk:00d0:0: failed to disable
[ 2.086878] l4_wkup_cm:clk:00b0:0: failed to disable
[ 2.093215] VFS: Cannot open root device "mmcblk0p2" or unknown-block(0,0): error -6
[ 2.101092] Please append a correct "root=" boot option; here are the available partitions:
[ 2.109521] 0100 65536 ram0
[ 2.109524] (driver?)
[ 2.115670] 0101 65536 ram1
[ 2.115672] (driver?)
[ 2.121797] 0102 65536 ram2
[ 2.121799] (driver?)
[ 2.127940] 0103 65536 ram3
[ 2.127942] (driver?)
[ 2.134083] 0104 65536 ram4
[ 2.134085] (driver?)
[ 2.140212] 0105 65536 ram5
[ 2.140214] (driver?)
[ 2.146353] 0106 65536 ram6
[ 2.146355] (driver?)
[ 2.152481] 0107 65536 ram7
[ 2.152483] (driver?)
[ 2.158622] 0108 65536 ram8
[ 2.158624] (driver?)
[ 2.164764] 0109 65536 ram9
[ 2.164766] (driver?)
[ 2.170892] 010a 65536 ram10
[ 2.170894] (driver?)
[ 2.177121] 010b 65536 ram11
[ 2.177123] (driver?)
[ 2.183335] 010c 65536 ram12
[ 2.177121] 010b 65536 ram11
[ 2.177123] (driver?)
[ 2.183335] 010c 65536 ram12
[ 2.183337] (driver?)
[ 2.189566] 010d 65536 ram13
[ 2.189568] (driver?)
[ 2.195796] 010e 65536 ram14
[ 2.195798] (driver?)
[ 2.202010] 010f 65536 ram15
[ 2.202012] (driver?)
[ 2.208247] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
[ 2.216554] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.5.5-john #1
[ 2.223368] Hardware name: Generic AM33XX (Flattened Device Tree)
[ 2.229528] [<c03124e0>] (unwind_backtrace) from [<c030c6dc>] (show_stack+0x10/0x14)
[ 2.237319] [<c030c6dc>] (show_stack) from [<c0daa3e8>] (dump_stack+0xbc/0xd0)
[ 2.244585] [<c0daa3e8>] (dump_stack) from [<c0338e60>] (panic+0x110/0x328)
[ 2.251586] [<c0338e60>] (panic) from [<c13014d8>] (mount_block_root+0x1ac/0x240)
[ 2.259105] [<c13014d8>] (mount_block_root) from [<c13017d8>] (mount_root+0x124/0x148)
[ 2.267057] [<c13017d8>] (mount_root) from [<c130197c>] (prepare_namespace+0x180/0x1bc)
[ 2.275100] [<c130197c>] (prepare_namespace) from [<c0dc1e50>] (kernel_init+0x8/0x110)
[ 2.283055] [<c0dc1e50>] (kernel_init) from [<c03010e8>] (ret_from_fork+0x14/0x2c)
[ 2.290655] Exception stack(0xdb0b1fb0 to 0xdb0b1ff8)
[ 2.295728] 1fa0: 00000000 00000000 00000000 00000000
[ 2.303941] 1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 2.312152] 1fe0: 00000000 00000000 00000000 00000000 00000013 00000000
[ 2.318812] ---[ end Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) ]---
所以看起来设备在读取uEnv.txt后可以正常读取分区一，但无法挂载或读取sd卡的第二分区
So it looks like the device can read partition one fine since its reading uEnv.txt but it can't mount or read partition two of the sd card
推荐答案
您是否指定了特定的 FPU?对于 BBB，您需要为 Use specific FPU option 选择 neon 的 IIRC，否则会出现这样的错误.
Did you specify a specific FPU? IIRC for the BBB you need to select neon for the Use specific FPU option, else you get an error like this.
另请参考https://tgarc.github.io/2015/03/08/building-a-linaro-cross-compiler-toolchain-with-cross-ng/
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