XUELK-AN-003: Running Buildroot distribution

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Info Box
SBC Lynx-top.png Applies to SBC Lynx

History

Version Date Notes
1.0.0 February 2017 First public release

Introduction

By default, AXEL ULite and SBC Lynx Embedded Linux Kit (XUELK) comes with a Yocto distribution. Nevertheless, other distributions can be used as well. This application note shows how to run one of them, Buildroot.

Buildroot is known to be very simple to configure and build. An exhaustive discussion of Buildroot is beyond the scope of this application note. Interested reader can refer for example to this presentation which compares in detail Yocto and Buildroot.

The test bed used for this application note is composed of the same hardware/software platform delivered along with the XUELK. About Buildroot, the version 2016.11.2 was used.

Donwloading, configuring and building

This process is straightforward. Once the file buildroot-2016.11.2.tar.gz is downloaded and decompressed on your Linux host machine, get into the Buildroot directory, and run make menuconfig.

Then enter the Target options menu and select:

  • ARM (little endian) for Target Architecture
  • cortex-A7 for Target Architecture Variant

as shown in the following picture.

Buildroot-cortex-A7.png

That's it: after saving your configuration, and exiting menuconfig, you can start the build process by simply issuing the make command.

Mounting the Buildroot file system on the target

Once the build process is completed, in the output/images subdirectory the file rootfs.tar is available. This file contains the root file system for the target.

In this example, this file was untarred on a NFS server, in order to mount it via NFS protocol by the target. The following dump shows the serial console messages, printed out by the target during the boot process:

U-Boot 2015.04-xuelk-1.1.0-00004-g007c1d7 (Feb 03 2017 - 15:39:12)

CPU:   Freescale i.MX6UL rev1.1 at 396 MHz
CPU:   Temperature 39 C
Reset cause: POR
Environment: SPI Flash
I2C:   ready
DRAM:  WARNING: SOM ConfigID on block 0 is UNLOCKED
WARNING: SOM ConfigID on block 0 is UNLOCKED
512 MiB
WARNING: SOM ConfigID on block 0 is UNLOCKED
WARNING: SOM ConfigID on block 0 is UNLOCKED
PMIC: PFUZE300 DEV_ID=0x30 REV_ID=0x11
NAND:  1024 MiB
MMC:   WARNING: SOM ConfigID on block 0 is UNLOCKED
WARNING: SOM ConfigID on block 0 is UNLOCKED
FSL_SDHC: 0
SF: Detected S25FL256S_64K with page size 256 Bytes, erase size 64 KiB, total 32 MiB
In:    serial
Out:   serial
Err:   serial
MMC: no card present
WARNING: SOM ConfigID on block 0 is UNLOCKED
SOM ConfigID#: 00000010
SOM UniqueID#: e6b3f362:3f3b61d4
WARNING: SOM ConfigID on block 0 is UNLOCKED
WARNING: SOM ConfigID on block 0 is UNLOCKED
Board: MX6UL SBCEXWARNING: SOM ConfigID on block 0 is UNLOCKED

WARNING: SOM ConfigID on block 0 is UNLOCKED
Net:   WARNING: SOM ConfigID on block 0 is UNLOCKED
WARNING: SOM ConfigID on block 0 is UNLOCKED
FEC0
Normal Boot
Hit any key to stop autoboot:  0
=> run net_nfs
Using FEC0 device
TFTP from server 192.168.0.23; our IP address is 192.168.0.81
Filename 'lynx/linux/xuelk-1.1.0_uImage'.
Load address: 0x80800000
Loading: #################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################
         ##############
         2 MiB/s
done
Bytes transferred = 6723656 (669848 hex)
Using FEC0 device
TFTP from server 192.168.0.23; our IP address is 192.168.0.81
Filename 'lynx/linux/xuelk-1.1.0_imx6ul-lynx-som0010.dtb'.
Load address: 0x83000000
Loading: #######
         1.6 MiB/s
done
Bytes transferred = 31663 (7baf hex)
FDT: override 'som_uniqueid' with 'e6b3f362:3f3b61d4'
FDT: override 'cb_uniqueid' with '00000000:00000000'
## Booting kernel from Legacy Image at 80800000 ...
   Image Name:   Linux-3.14.52-xuelk-1.1.0
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:    6723592 Bytes = 6.4 MiB
   Load Address: 80008000
   Entry Point:  80008000
   Verifying Checksum ... OK
## Flattened Device Tree blob at 83000000
   Booting using the fdt blob at 0x83000000
   Loading Kernel Image ... OK
   reserving fdt memory region: addr=83000000 size=8000
   Using Device Tree in place at 83000000, end 8300afff

Starting kernel ...

[    0.000000] Booting Linux on physical CPU 0x0
[    0.000000] Linux version 3.14.52-xuelk-1.1.0 (jenkins@linuxserver2) (gcc version 4.9.2 (GCC) ) #7 SMP PREEMPT Fri Nov 25 17:15:33 CET 2016
[    0.000000] CPU: ARMv7 Processor [410fc075] revision 5 (ARMv7), cr=10c53c7d
[    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
[    0.000000] Machine model: Freescale i.MX6 UltraLite SBCEX Board
[    0.000000] cma: CMA: reserved 64 MiB at 9c000000
[    0.000000] Memory policy: Data cache writealloc
[    0.000000] PERCPU: Embedded 8 pages/cpu @9bbc0000 s8832 r8192 d15744 u32768
[    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 130048
[    0.000000] Kernel command line: root=/dev/nfs rw nfsroot=192.168.0.80:/opt/nfsroot/buildroot/2016.11.2/A7,v3,tcp ip=192.168.0.81:192.168.0.23::255.255.255.0:lynx:eth0:off panic=1 fec_mac=00:50:C2:1E:af:b3 console=ttymxc0,115200 vmalloc=400M mtdparts=gpmi-nand:8M(nand-uboot),1M(nand-env1),1M(nand-env2),1M(nand-fdt),1M(nand-spare),8M(nand-kernel),4M(nand-splash),-(nand-ubi);spi0.0:1M(spi-uboot),256k(spi-env1),256k(spi-env2),512k(spi-dtb),6M(spi-kernel),4M(spi-splash),-(spi-free)
[    0.000000] PID hash table entries: 2048 (order: 1, 8192 bytes)
[    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: 441204K/524288K available (8228K kernel code, 596K rwdata, 3084K rodata, 408K init, 436K bss, 83084K reserved, 0K highmem)
[    0.000000] Virtual kernel memory layout:
[    0.000000]     vector  : 0xffff0000 - 0xffff1000   (   4 kB)
[    0.000000]     fixmap  : 0xfff00000 - 0xfffe0000   ( 896 kB)
[    0.000000]     vmalloc : 0xa0800000 - 0xff000000   (1512 MB)
[    0.000000]     lowmem  : 0x80000000 - 0xa0000000   ( 512 MB)
[    0.000000]     pkmap   : 0x7fe00000 - 0x80000000   (   2 MB)
[    0.000000]     modules : 0x7f000000 - 0x7fe00000   (  14 MB)
[    0.000000]       .text : 0x80008000 - 0x80b14508   (11314 kB)
[    0.000000]       .init : 0x80b15000 - 0x80b7b280   ( 409 kB)
[    0.000000]       .data : 0x80b7c000 - 0x80c113d0   ( 597 kB)
[    0.000000]        .bss : 0x80c113dc - 0x80c7e624   ( 437 kB)
[    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[    0.000000] Preemptible hierarchical RCU implementation.
[    0.000000]  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 16
[    0.000000] Switching to timer-based delay loop
[    0.000019] sched_clock: 32 bits at 3000kHz, resolution 333ns, wraps every 1431655765682ns
[    0.002380] clocksource_of_init: no matching clocksources found
[    0.002728] Console: colour dummy device 80x30
[    0.002778] Calibrating delay loop (skipped), value calculated using timer frequency.. 6.00 BogoMIPS (lpj=30000)
[    0.002812] pid_max: default: 32768 minimum: 301
[    0.003218] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
[    0.003251] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
[    0.020283] Initializing cgroup subsys net_cls
[    0.020397] CPU: Testing write buffer coherency: ok
[    0.020921] /cpus/cpu@0 missing clock-frequency property
[    0.020963] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
[    0.021025] Setting up static identity map for 0x807d6458 - 0x807d64b0
[    0.068230] Brought up 1 CPUs
[    0.068270] SMP: Total of 1 processors activated (6.00 BogoMIPS).
[    0.068291] CPU: All CPU(s) started in SVC mode.
[    0.069675] devtmpfs: initialized
[    0.081295] VFP support v0.3: implementor 41 architecture 2 part 30 variant 7 rev 5
[    0.082099] pinctrl core: initialized pinctrl subsystem
[    0.083065] regulator-dummy: no parameters
[    0.088276] NET: Registered protocol family 16
[    0.106487] DMA: preallocated 256 KiB pool for atomic coherent allocations
[    0.108180] cpuidle: using governor ladder
[    0.108208] cpuidle: using governor menu
[    0.108754] Use WDOG1 as reset source
[    0.127190] syscon 20c8000.anatop: regmap [mem 0x020c8000-0x020c8fff] registered
[    0.127947] vdd3p0: 2625 <--> 3400 mV at 3000 mV
[    0.128935] cpu: 725 <--> 1450 mV at 1150 mV
[    0.129875] vddsoc: 725 <--> 1450 mV at 1175 mV
[    0.135446] syscon 20e4000.iomuxc-gpr: regmap [mem 0x020e4000-0x020e7fff] registered
[    0.142591] syscon 21ac000.romcp: regmap [mem 0x021ac000-0x021affff] registered
[    0.144111] syscon 21bc000.ocotp-ctrl: regmap [mem 0x021bc000-0x021bffff] registered
[    0.149153] hw-breakpoint: found 5 (+1 reserved) breakpoint and 4 watchpoint registers.
[    0.149185] hw-breakpoint: maximum watchpoint size is 8 bytes.
[    0.153092] imx6ul-pinctrl 20e0000.iomuxc: initialized IMX pinctrl driver
[    0.156049] 20dc000.gpc supply pu not found, using dummy regulator
[    0.188853] bio: create slab <bio-0> at 0
[    0.195613] mxs-dma 1804000.dma-apbh: initialized
[    0.196578] vref-3v3: 3300 mV
[    0.197345] usb_otg1_vbus: 5000 mV
[    0.198091] usb_otg2_vbus: 5000 mV
[    0.198722] wilink-wl-en: 3300 mV
[    0.200555] i2c-core: driver [max17135] using legacy suspend method
[    0.200582] i2c-core: driver [max17135] using legacy resume method
[    0.202062] SCSI subsystem initialized
[    0.203310] usbcore: registered new interface driver usbfs
[    0.203494] usbcore: registered new interface driver hub
[    0.203822] usbcore: registered new device driver usb
[    0.205527] imx-i2c 21a0000.i2c: Cannot look up pinctrl state recovery: -19
[    0.207069] i2c i2c-0: IMX I2C adapter registered
[    0.207307] Linux video capture interface: v2.00
[    0.207508] pps_core: LinuxPPS API ver. 1 registered
[    0.207532] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
[    0.207597] PTP clock support registered
[    0.210225] MIPI CSI2 driver module loaded
[    0.210791] Advanced Linux Sound Architecture Driver Initialized.
[    0.212934] Bluetooth: Core ver 2.18
[    0.213083] NET: Registered protocol family 31
[    0.213106] Bluetooth: HCI device and connection manager initialized
[    0.213145] Bluetooth: HCI socket layer initialized
[    0.213178] Bluetooth: L2CAP socket layer initialized
[    0.213264] Bluetooth: SCO socket layer initialized
[    0.215228] Switched to clocksource mxc_timer1
[    0.216766] cfg80211: Calling CRDA to update world regulatory domain
[    0.241491] NET: Registered protocol family 2
[    0.243442] TCP established hash table entries: 4096 (order: 2, 16384 bytes)
[    0.243574] TCP bind hash table entries: 4096 (order: 3, 32768 bytes)
[    0.243733] TCP: Hash tables configured (established 4096 bind 4096)
[    0.243852] TCP: reno registered
[    0.243887] UDP hash table entries: 256 (order: 1, 8192 bytes)
[    0.243947] UDP-Lite hash table entries: 256 (order: 1, 8192 bytes)
[    0.244474] NET: Registered protocol family 1
[    0.245371] RPC: Registered named UNIX socket transport module.
[    0.245406] RPC: Registered udp transport module.
[    0.245425] RPC: Registered tcp transport module.
[    0.245444] RPC: Registered tcp NFSv4.1 backchannel transport module.
[    0.248491] imx rpmsg driver is registered.
[    0.250163] Bus freq driver module loaded
[    0.252148] futex hash table entries: 256 (order: 2, 16384 bytes)
[    0.270899] VFS: Disk quotas dquot_6.5.2
[    0.271599] Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
[    0.277819] NFS: Registering the id_resolver key type
[    0.278044] Key type id_resolver registered
[    0.278068] Key type id_legacy registered
[    0.278159] jffs2: version 2.2. (NAND) c 2001-2006 Red Hat, Inc.
[    0.279996] fuse init (API version 7.22)
[    0.281228] msgmni has been set to 989
[    0.290261] io scheduler noop registered
[    0.290296] io scheduler deadline registered
[    0.290802] io scheduler cfq registered (default)
[    0.291918] imx-weim 21b8000.weim: Driver registered.
[    0.299233] MIPI DSI driver module loaded
[    0.299681] MIPI DSI driver module loaded
[    0.304197] imx-sdma 20ec000.sdma: no event needs to be remapped
[    0.304416] imx-sdma 20ec000.sdma: loaded firmware 3.2
[    0.313067] imx-sdma 20ec000.sdma: initialized
[    0.315788] pfuze100-regulator 0-0008: Full layer: 1, Metal layer: 1
[    0.316457] pfuze100-regulator 0-0008: FAB: 0, FIN: 0
[    0.316490] pfuze100-regulator 0-0008: pfuze3000 found.
[    0.317845] SW1A: 700 <--> 3300 mV at 3300 mV
[    0.319602] SW1B: 700 <--> 1475 mV at 1400 mV
[    0.320724] SW2: 2500 <--> 3300 mV at 3300 mV
[    0.321848] SW3: 900 <--> 1650 mV at 1350 mV
[    0.322960] SWBST: 5000 <--> 5150 mV at 5000 mV
[    0.324107] VSNVS: 1000 <--> 3000 mV at 3000 mV
[    0.324576] VREFDDR: 750 mV
[    0.325663] VLDO1: 1800 <--> 3300 mV at 3300 mV
[    0.327347] VLDO2: 800 <--> 1550 mV at 1500 mV
[    0.328489] VCCSD: 2850 <--> 3300 mV at 3300 mV
[    0.329614] V33: 2850 <--> 3300 mV at 3300 mV
[    0.330795] VLDO3: 1800 <--> 3300 mV at 1800 mV
[    0.331917] VLDO4: 1800 <--> 3300 mV at 1800 mV
[    0.332748] Serial: IMX driver
[    0.333445] 2020000.serial: ttymxc0 at MMIO 0x2020000 (irq = 58, base_baud = 5000000) is a IMX
[    1.153740] console [ttymxc0] enabled
[    1.158938] 2024000.serial: ttymxc7 at MMIO 0x2024000 (irq = 72, base_baud = 5000000) is a IMX
[    1.169508] 21e8000.serial: ttymxc1 at MMIO 0x21e8000 (irq = 59, base_baud = 5000000) is a IMX
[    1.179198] serial: Freescale lpuart driver
[    1.187242] imx sema4 driver is registered.
[    1.191646] [drm] Initialized drm 1.1.0 20060810
[    1.197500] [drm] Initialized vivante 1.0.0 20120216 on minor 0
[    1.224817] brd: module loaded
[    1.239619] loop: module loaded
[    1.259766] nand: device found, Manufacturer ID: 0x01, Chip ID: 0xd3
[    1.266221] nand: AMD/Spansion S34ML08G1
[    1.270182] nand: 1024MiB, SLC, page size: 2048, OOB size: 64
[    1.276281] gpmi-nand 1806000.gpmi-nand: mode:4 ,failed in set feature.
[    1.282957] Scanning device for bad blocks
[    1.613201] Bad eraseblock 2341 at 0x0000124a0000
[    1.651873] random: nonblocking pool is initialized
[    2.437712] 8 cmdlinepart partitions found on MTD device gpmi-nand
[    2.443938] Creating 8 MTD partitions on "gpmi-nand":
[    2.449087] 0x000000000000-0x000000800000 : "nand-uboot"
[    2.457226] 0x000000800000-0x000000900000 : "nand-env1"
[    2.465057] 0x000000900000-0x000000a00000 : "nand-env2"
[    2.473064] 0x000000a00000-0x000000b00000 : "nand-fdt"
[    2.480936] 0x000000b00000-0x000000c00000 : "nand-spare"
[    2.489157] 0x000000c00000-0x000001400000 : "nand-kernel"
[    2.497286] 0x000001400000-0x000001800000 : "nand-splash"
[    2.505036] 0x000001800000-0x000040000000 : "nand-ubi"
[    2.514568] gpmi-nand 1806000.gpmi-nand: driver registered.
[    2.523703] m25p80 spi0.0: s25fl256s1 (32768 Kbytes)
[    2.528827] 7 cmdlinepart partitions found on MTD device spi0.0
[    2.534781] Creating 7 MTD partitions on "spi0.0":
[    2.539716] 0x000000000000-0x000000100000 : "spi-uboot"
[    2.547540] 0x000000100000-0x000000140000 : "spi-env1"
[    2.555091] 0x000000140000-0x000000180000 : "spi-env2"
[    2.562796] 0x000000180000-0x000000200000 : "spi-dtb"
[    2.570361] 0x000000200000-0x000000800000 : "spi-kernel"
[    2.578370] 0x000000800000-0x000000c00000 : "spi-splash"
[    2.586430] 0x000000c00000-0x000002000000 : "spi-free"
[    2.594067] spi_imx 2008000.ecspi: probed
[    2.600294] CAN device driver interface
[    2.606791] 20b4000.ethernet supply phy not found, using dummy regulator
[    2.614740] pps pps0: new PPS source ptp0
[    2.619948] libphy: fec_enet_mii_bus: probed
[    2.627151] fec 20b4000.ethernet eth1: registered PHC device 0
[    2.634664] 2188000.ethernet supply phy not found, using dummy regulator
[    2.642855] pps pps1: new PPS source ptp1
[    2.649366] fec 2188000.ethernet eth0: registered PHC device 1
[    2.657167] pegasus: v0.9.3 (2013/04/25), Pegasus/Pegasus II USB Ethernet driver
[    2.664781] usbcore: registered new interface driver pegasus
[    2.670726] usbcore: registered new interface driver rtl8150
[    2.676709] usbcore: registered new interface driver r8152
[    2.682445] usbcore: registered new interface driver asix
[    2.688140] usbcore: registered new interface driver ax88179_178a
[    2.694398] usbcore: registered new interface driver cdc_ether
[    2.700469] usbcore: registered new interface driver dm9601
[    2.706260] usbcore: registered new interface driver sr9700
[    2.712060] usbcore: registered new interface driver CoreChips
[    2.718154] usbcore: registered new interface driver smsc75xx
[    2.724106] usbcore: registered new interface driver smsc95xx
[    2.730066] usbcore: registered new interface driver net1080
[    2.735935] usbcore: registered new interface driver plusb
[    2.741585] usbcore: registered new interface driver cdc_subset
[    2.747709] usbcore: registered new interface driver zaurus
[    2.753447] usbcore: registered new interface driver MOSCHIP usb-ethernet driver
[    2.761182] usbcore: registered new interface driver cdc_ncm
[    2.766931] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[    2.773543] ehci-mxc: Freescale On-Chip EHCI Host driver
[    2.779388] usbcore: registered new interface driver usb-storage
[    2.785650] usbcore: registered new interface driver usb_ehset_test
[    2.794150] 2184800.usbmisc supply vbus-wakeup not found, using dummy regulator
[    2.814305] ci_hdrc ci_hdrc.1: EHCI Host Controller
[    2.819519] ci_hdrc ci_hdrc.1: new USB bus registered, assigned bus number 1
[    2.845311] ci_hdrc ci_hdrc.1: USB 2.0 started, EHCI 1.00
[    2.853021] hub 1-0:1.0: USB hub found
[    2.857048] hub 1-0:1.0: 1 port detected
[    2.863249] mousedev: PS/2 mouse device common for all mice
[    2.870377] snvs_pwrkey 20cc000.snvs-pwrkey: can't get snvs clock
[    2.877429] input: 20cc000.snvs-pwrkey as /devices/soc0/soc.0/2000000.aips-bus/20cc000.snvs-pwrkey/input/input0
[    2.888334] snvs_pwrkey 20cc000.snvs-pwrkey: i.MX snvs powerkey probed
[    2.896300] i2c-core: driver [egalax_allpoint_i2c] using legacy suspend method
[    2.903563] i2c-core: driver [egalax_allpoint_i2c] using legacy resume method
[    2.912223] i2c-core: driver [isl29023] using legacy suspend method
[    2.918664] i2c-core: driver [isl29023] using legacy resume method
[    2.926102] snvs_rtc 20cc034.snvs-rtc-lp: can't get snvs-rtc clock
[    2.933270] snvs_rtc 20cc034.snvs-rtc-lp: rtc core: registered 20cc034.snvs-rtc-lp as rtc0
[    2.941677] snvs_rtc 20cc034.snvs-rtc-lp: configured with power off disabled
[    2.949121] i2c /dev entries driver
[    2.953536] IR NEC protocol handler initialized
[    2.958988] IR RC5(x) protocol handler initialized
[    2.963819] IR RC6 protocol handler initialized
[    2.968430] IR JVC protocol handler initialized
[    2.972987] IR Sony protocol handler initialized
[    2.977703] IR RC5 (streamzap) protocol handler initialized
[    2.983308] IR SANYO protocol handler initialized
[    2.988072] IR MCE Keyboard/mouse protocol handler initialized
[    2.997242] i2c-core: driver [mag3110] using legacy suspend method
[    3.003467] i2c-core: driver [mag3110] using legacy resume method
[    3.010792] imx2-wdt 20bc000.wdog: IMX2+ Watchdog Timer enabled. timeout=60s (nowayout=0)
[    3.019494] Bluetooth: HCI UART driver ver 2.2
[    3.023989] Bluetooth: HCI H4 protocol initialized
[    3.028855] Bluetooth: HCI BCSP protocol initialized
[    3.033849] Bluetooth: HCILL protocol initialized
[    3.038662] ci_hdrc ci_hdrc.0: there is a vbus glitch
[    3.043821] Bluetooth: HCIATH3K protocol initialized
[    3.049176] usbcore: registered new interface driver bcm203x
[    3.055094] usbcore: registered new interface driver btusb
[    3.060887] usbcore: registered new interface driver ath3k
[    3.067034] sdhci: Secure Digital Host Controller Interface driver
[    3.073248] sdhci: Copyright(c) Pierre Ossman
[    3.077693] sdhci-pltfm: SDHCI platform and OF driver helper
[    3.086961] mmc0: no vqmmc regulator found
[    3.091120] mmc0: no vmmc regulator found
[    3.135309] mmc0: SDHCI controller on 2190000.usdhc [2190000.usdhc] using ADMA
[    3.146912] mmc1: no vqmmc regulator found
[    3.265308] mmc1: SDHCI controller on 2194000.usdhc [2194000.usdhc] using ADMA
[    3.282442] caam 2140000.caam: Instantiated RNG4 SH0
[    3.343205] caam 2140000.caam: Instantiated RNG4 SH1
[    3.348265] caam 2140000.caam: device ID = 0x0a160300 (Era 8)
[    3.354049] caam 2140000.caam: job rings = 3, qi = 0
[    3.492589] caam algorithms registered in /proc/crypto
[    3.503290] caam_jr 2141000.jr0: registering rng-caam
[    3.510591] platform caam_sm: blkkey_ex: 8 keystore units available
[    3.517836] platform caam_sm: 64-bit clear key:
[    3.522430] platform caam_sm: [0000] 00 01 02 03 04 0f 06 07
[    3.528240] platform caam_sm: 64-bit black key:
[    3.532820] platform caam_sm: [0000] f7 1f 6f 3d 30 4e 37 e5
[    3.538622] platform caam_sm: [0008] eb 5b f9 c7 8b 67 f1 57
[    3.544318] platform caam_sm: 128-bit clear key:
[    3.549077] platform caam_sm: [0000] 00 01 02 03 04 0f 06 07
[    3.554776] platform caam_sm: [0008] 08 09 0a 0b 0c 0d 0e 0f
[    3.560588] platform caam_sm: 128-bit black key:
[    3.565296] platform caam_sm: [0000] a1 86 60 78 4f 18 9e f4
[    3.571050] platform caam_sm: [0008] 8a 57 ff d7 d5 79 5a a6
[    3.576783] platform caam_sm: 192-bit clear key:
[    3.581442] platform caam_sm: [0000] 00 01 02 03 04 0f 06 07
[    3.589249] platform caam_sm: [0008] 08 09 0a 0b 0c 0d 0e 0f
[    3.594953] platform caam_sm: [0016] 10 11 12 13 14 15 16 17
[    3.600681] platform caam_sm: 192-bit black key:
[    3.605437] platform caam_sm: [0000] 12 35 88 69 a5 74 58 32
[    3.613236] platform caam_sm: [0008] d1 e2 7f 80 d9 62 ca e5
[    3.623148] platform caam_sm: [0016] fc e0 79 c5 97 89 1b a3
[    3.632013] platform caam_sm: [0024] 88 9a bb 13 42 6f 75 1a
[    3.639845] platform caam_sm: 256-bit clear key:
[    3.646659] platform caam_sm: [0000] 00 01 02 03 04 0f 06 07
[    3.654439] platform caam_sm: [0008] 08 09 0a 0b 0c 0d 0e 0f
[    3.662263] platform caam_sm: [0016] 10 11 12 13 14 15 16 17
[    3.670101] platform caam_sm: [0024] 18 19 1a 1b 1c 1d 1e 1f
[    3.677922] platform caam_sm: 256-bit black key:
[    3.684661] platform caam_sm: [0000] ea 3b 52 80 d6 b8 75 2a
[    3.692493] platform caam_sm: [0008] 44 d3 b2 ab db 6c 23 d4
[    3.701350] platform caam_sm: [0016] 09 6c fb 25 3e b8 d0 26
[    3.711222] platform caam_sm: [0024] 69 d6 76 dc 08 55 f3 ad
[    3.716959] platform caam_sm: 64-bit unwritten blob:
[    3.721964] platform caam_sm: [0000] 00 00 00 00 00 00 00 00
[    3.727695] platform caam_sm: [0008] 00 00 00 00 00 00 00 00
[    3.733393] platform caam_sm: [0016] 00 00 00 00 00 00 00 00
[    3.739119] platform caam_sm: [0024] 00 00 00 00 00 00 00 00
[    3.744815] platform caam_sm: [0032] 00 00 00 00 00 00 00 00
[    3.750539] platform caam_sm: [0040] 00 00 00 00 00 00 00 00
[    3.756265] platform caam_sm: [0048] 00 00 00 00 00 00 00 00
[    3.761961] platform caam_sm: [0056] 00 00 00 00 00 00 00 00
[    3.767683] platform caam_sm: [0064] 00 00 00 00 00 00 00 00
[    3.773379] platform caam_sm: [0072] 00 00 00 00 00 00 00 00
[    3.779102] platform caam_sm: [0080] 00 00 00 00 00 00 00 00
[    3.784798] platform caam_sm: [0088] 00 00 00 00 00 00 00 00
[    3.790574] platform caam_sm: 128-bit unwritten blob:
[    3.795746] platform caam_sm: [0000] 00 00 00 00 00 00 00 00
[    3.801446] platform caam_sm: [0008] 00 00 00 00 00 00 00 00
[    3.807181] platform caam_sm: [0016] 00 00 00 00 00 00 00 00
[    3.812879] platform caam_sm: [0024] 00 00 00 00 00 00 00 00
[    3.820673] platform caam_sm: [0032] 00 00 00 00 00 00 00 00
[    3.826408] platform caam_sm: [0040] 00 00 00 00 00 00 00 00
[    3.832106] platform caam_sm: [0048] 00 00 00 00 00 00 00 00
[    3.837885] platform caam_sm: [0056] 00 00 00 00 00 00 00 00
[    3.845719] platform caam_sm: [0064] 00 00 00 00 00 00 00 00
[    3.855531] platform caam_sm: [0072] 00 00 00 00 00 00 00 00
[    3.864325] platform caam_sm: [0080] 00 00 00 00 00 00 00 00
[    3.872159] platform caam_sm: [0088] 00 00 00 00 00 00 00 00
[    3.879973] platform caam_sm: 196-bit unwritten blob:
[    3.887181] platform caam_sm: [0000] 00 00 00 00 00 00 00 00
[    3.894944] platform caam_sm: [0008] 00 00 00 00 00 00 00 00
[    3.902768] platform caam_sm: [0016] 00 00 00 00 00 00 00 00
[    3.910602] platform caam_sm: [0024] 00 00 00 00 00 00 00 00
[    3.918434] platform caam_sm: [0032] 00 00 00 00 00 00 00 00
[    3.926259] platform caam_sm: [0040] 00 00 00 00 00 00 00 00
[    3.935064] platform caam_sm: [0048] 00 00 00 00 00 00 00 00
[    3.944917] platform caam_sm: [0056] 00 00 00 00 00 00 00 00
[    3.950663] platform caam_sm: [0064] 00 00 00 00 00 00 00 00
[    3.956394] platform caam_sm: [0072] 00 00 00 00 00 00 00 00
[    3.962091] platform caam_sm: [0080] 00 00 00 00 00 00 00 00
[    3.967817] platform caam_sm: [0088] 00 00 00 00 00 00 00 00
[    3.973507] platform caam_sm: 256-bit unwritten blob:
[    3.978634] platform caam_sm: [0000] 00 00 00 00 00 00 00 00
[    3.984331] platform caam_sm: [0008] 00 00 00 00 00 00 00 00
[    3.990130] platform caam_sm: [0016] 00 00 00 00 00 00 00 00
[    3.995877] platform caam_sm: [0024] 00 00 00 00 00 00 00 00
[    4.001577] platform caam_sm: [0032] 00 00 00 00 00 00 00 00
[    4.007321] platform caam_sm: [0040] 00 00 00 00 00 00 00 00
[    4.013021] platform caam_sm: [0048] 00 00 00 00 00 00 00 00
[    4.018748] platform caam_sm: [0056] 00 00 00 00 00 00 00 00
[    4.024445] platform caam_sm: [0064] 00 00 00 00 00 00 00 00
[    4.030173] platform caam_sm: [0072] 00 00 00 00 00 00 00 00
[    4.035907] platform caam_sm: [0080] 00 00 00 00 00 00 00 00
[    4.041605] platform caam_sm: [0088] 00 00 00 00 00 00 00 00
[    4.047666] platform caam_sm: 64-bit black key in blob:
[    4.052945] platform caam_sm: [0000] 45 c0 f1 d7 5b d5 9f 7f
[    4.058690] platform caam_sm: [0008] d0 e6 4b 15 63 48 df 7a
[    4.064391] platform caam_sm: [0016] ae 13 19 88 4b cb 5f 45
[    4.070120] platform caam_sm: [0024] 13 38 df 94 aa 75 bd 14
[    4.075848] platform caam_sm: [0032] ab 48 68 f3 6a e2 fe fa
[    4.081545] platform caam_sm: [0040] 70 81 04 c8 24 dc ba 5c
[    4.087270] platform caam_sm: [0048] 16 cf d1 db 12 3c f7 3d
[    4.092966] platform caam_sm: [0056] 00 00 00 00 00 00 00 00
[    4.098689] platform caam_sm: [0064] 00 00 00 00 00 00 00 00
[    4.104385] platform caam_sm: [0072] 00 00 00 00 00 00 00 00
[    4.110108] platform caam_sm: [0080] 00 00 00 00 00 00 00 00
[    4.115834] platform caam_sm: [0088] 00 00 00 00 00 00 00 00
[    4.121522] platform caam_sm: 128-bit black key in blob:
[    4.126902] platform caam_sm: [0000] d8 46 54 69 68 b9 f5 c4
[    4.132599] platform caam_sm: [0008] e9 17 c6 16 63 b9 84 44
[    4.138325] platform caam_sm: [0016] dd 13 09 b4 c1 e9 87 b2
[    4.144022] platform caam_sm: [0024] 80 99 40 49 d1 ab 15 47
[    4.149744] platform caam_sm: [0032] f8 78 66 b8 6f a8 ae b2
[    4.155469] platform caam_sm: [0040] 81 b9 22 8f 54 73 fb 20
[    4.161167] platform caam_sm: [0048] af 98 70 8d c0 5d 41 33
[    4.166895] platform caam_sm: [0056] 95 4e 49 34 9f 81 f7 26
[    4.172591] platform caam_sm: [0064] 00 00 00 00 00 00 00 00
[    4.178313] platform caam_sm: [0072] 00 00 00 00 00 00 00 00
[    4.184010] platform caam_sm: [0080] 00 00 00 00 00 00 00 00
[    4.189731] platform caam_sm: [0088] 00 00 00 00 00 00 00 00
[    4.195446] platform caam_sm: 192-bit black key in blob:
[    4.200798] platform caam_sm: [0000] 64 b2 9b f5 c2 d3 bd e0
[    4.206520] platform caam_sm: [0008] 91 ed 95 31 0d 79 b4 4c
[    4.212216] platform caam_sm: [0016] c1 d2 df 5f d2 1e 0e eb
[    4.217940] platform caam_sm: [0024] 3b 03 30 01 57 35 f9 a3
[    4.223637] platform caam_sm: [0032] 07 3d ec 91 bc f4 e6 b0
[    4.229359] platform caam_sm: [0040] 50 3d 54 58 f6 c8 dc 6c
[    4.235055] platform caam_sm: [0048] 82 f9 35 55 30 24 63 7d
[    4.240780] platform caam_sm: [0056] 44 4a 90 56 c3 70 6c de
[    4.246503] platform caam_sm: [0064] 8b d3 00 a2 59 ac 6a dc
[    4.252200] platform caam_sm: [0072] 00 00 00 00 00 00 00 00
[    4.257922] platform caam_sm: [0080] 00 00 00 00 00 00 00 00
[    4.263617] platform caam_sm: [0088] 00 00 00 00 00 00 00 00
[    4.269332] platform caam_sm: 256-bit black key in blob:
[    4.274685] platform caam_sm: [0000] 4f e9 36 6d 4a ae 1f 86
[    4.280409] platform caam_sm: [0008] 74 aa 04 5a 27 2c 83 81
[    4.286134] platform caam_sm: [0016] d2 92 61 02 a2 be a8 23
[    4.291832] platform caam_sm: [0024] b9 71 84 d0 b1 91 eb e1
[    4.297556] platform caam_sm: [0032] d3 2a 0c f8 e6 10 19 7a
[    4.303253] platform caam_sm: [0040] 1b 7f 11 df 03 6c 03 ad
[    4.308977] platform caam_sm: [0048] 3d d8 01 90 b0 97 e2 8c
[    4.314675] platform caam_sm: [0056] 50 80 d4 fe 2f 88 b4 61
[    4.320397] platform caam_sm: [0064] 44 6d ec cb c1 ae 93 3e
[    4.326120] platform caam_sm: [0072] c1 ee b4 2b 31 43 80 aa
[    4.331816] platform caam_sm: [0080] 00 00 00 00 00 00 00 00
[    4.337541] platform caam_sm: [0088] 00 00 00 00 00 00 00 00
[    4.343493] platform caam_sm: restored 64-bit black key:
[    4.348896] platform caam_sm: [0000] fb 64 84 76 81 7a fb 55
[    4.354594] platform caam_sm: [0008] 48 48 d6 a4 1f 87 99 de
[    4.360313] platform caam_sm: restored 128-bit black key:
[    4.365782] platform caam_sm: [0000] a1 86 60 78 4f 18 9e f4
[    4.371479] platform caam_sm: [0008] 8a 57 ff d7 d5 79 5a a6
[    4.377197] platform caam_sm: restored 192-bit black key:
[    4.382632] platform caam_sm: [0000] 12 35 88 69 a5 74 58 32
[    4.388357] platform caam_sm: [0008] d1 e2 7f 80 d9 62 ca e5
[    4.394053] platform caam_sm: [0016] eb 3a 05 ce b9 ee cb 8b
[    4.399775] platform caam_sm: [0024] ae 03 5b 02 5c a8 87 35
[    4.405491] platform caam_sm: restored 256-bit black key:
[    4.410928] platform caam_sm: [0000] ea 3b 52 80 d6 b8 75 2a
[    4.416653] platform caam_sm: [0008] 44 d3 b2 ab db 6c 23 d4
[    4.422350] platform caam_sm: [0016] 09 6c fb 25 3e b8 d0 26
[    4.428074] platform caam_sm: [0024] 69 d6 76 dc 08 55 f3 ad
[    4.434334] snvs-secvio 20cc000.caam-snvs: can't get snvs clock
[    4.440428] snvs-secvio 20cc000.caam-snvs: violation handlers armed - non-secure state
[    4.449277] usbcore: registered new interface driver usbhid
[    4.454891] usbhid: USB HID core driver
[    4.468317] fsl-asrc 2034000.asrc: driver registered
[    4.483606] NET: Registered protocol family 26
[    4.488274] Netfilter messages via NETLINK v0.30.
[    4.493078] nfnl_acct: registering with nfnetlink.
[    4.498067] nf_conntrack version 0.5.0 (7917 buckets, 31668 max)
[    4.505436] nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>
[    4.512184] xt_time: kernel timezone is -0000
[    4.517289] ip_tables: (C) 2000-2006 Netfilter Core Team
[    4.522847] arp_tables: (C) 2002 David S. Miller
[    4.527670] TCP: cubic registered
[    4.532393] NET: Registered protocol family 10
[    4.539220] sit: IPv6 over IPv4 tunneling driver
[    4.545738] NET: Registered protocol family 17
[    4.550284] can: controller area network core (rev 20120528 abi 9)
[    4.556749] NET: Registered protocol family 29
[    4.561235] can: raw protocol (rev 20120528)
[    4.565579] can: broadcast manager protocol (rev 20120528 t)
[    4.571287] can: netlink gateway (rev 20130117) max_hops=1
[    4.577526] Bluetooth: RFCOMM TTY layer initialized
[    4.582487] Bluetooth: RFCOMM socket layer initialized
[    4.587892] Bluetooth: RFCOMM ver 1.11
[    4.591735] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[    4.597130] Bluetooth: BNEP filters: protocol multicast
[    4.602419] Bluetooth: BNEP socket layer initialized
[    4.607454] Bluetooth: HIDP (Human Interface Emulation) ver 1.2
[    4.613427] Bluetooth: HIDP socket layer initialized
[    4.618633] 8021q: 802.1Q VLAN Support v1.8
[    4.622981] Key type dns_resolver registered
[    4.629007] cpu cpu0: dev_pm_opp_get_opp_count: device OPP not found (-19)
[    4.659283] SWBST: disabling
[    4.662219] wilink-wl-en: disabling
[    4.665854] usb_otg1_vbus: disabling
[    4.669467] regulator-dummy: disabling
[    4.673781] imx mcc test is registered.
[    4.679572] snvs_rtc 20cc034.snvs-rtc-lp: setting system clock to 2016-12-15 12:03:42 UTC (1481803422)
[    4.785699] fec 2188000.ethernet eth0: Freescale FEC PHY driver [Micrel KSZ8081 or KSZ8091] (mii_bus:phy_addr=20b4000.ethernet:03, irq=-1)
[    4.835433] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[    8.786030] libphy: 20b4000.ethernet:03 - Link is Up - 100/Full
[    8.795480] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[    8.816234] IP-Config: Complete:
[    8.819581]      device=eth0, hwaddr=00:50:c2:1e:af:b3, ipaddr=192.168.0.81, mask=255.255.255.0, gw=255.255.255.255
[    8.830383]      host=lynx, domain=, nis-domain=(none)
[    8.836534]      bootserver=192.168.0.23, rootserver=192.168.0.80, rootpath=
[    8.843915] ALSA device list:
[    8.847022]   No soundcards found.
[   10.874100] VFS: Mounted root (nfs filesystem) on device 0:12.
[   10.882159] devtmpfs: mounted
[   10.887539] Freeing unused kernel memory: 408K (80b15000 - 80b7b000)
Starting logging: OK
Initializing random number generator... done.
Starting network: ip: RTNETLINK answers: File exists
FAIL

Welcome to Buildroot
buildroot login: root
#

As we used the default configuration, the resulting root file system is very small:

# cd ..
# pwd
/
# du -csh
1.5M    .
1.5M    total
# du -csh *
640.0K  bin
0       dev
124.0K  etc
556.0K  lib
0       lib32
0       linuxrc
4.0K    media
4.0K    mnt
4.0K    opt
0       proc
8.0K    root
12.0K   run
16.0K   sbin
0       sys
52.0K   tmp
56.0K   usr
12.0K   var
1.5M    total
# free
             total       used       free     shared    buffers     cached
Mem:        507148      22068     485080          0          0       1380
-/+ buffers/cache:      20688     486460
Swap:            0          0          0

In real world applications, additional packages are usually added by selecting them under the Target packages item of the configuration menu. Just look at the packages directory to see which ones are available out of the box. To add further packages, please refer to this link.