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組み込み用途のLinux環境を構築する際に利用される Buildroot は、ターゲットボードとして Raspberry Pi をサポートしている。
開発に必要なパッケージ群の追加
$ sudo apt install build-essential unzip rsync bc libncurses-dev
Buildroot のダウンロード
$ wget https://buildroot.org/downloads/buildroot-2021.02.8.tar.bz2
展開
$ tar jxvf buildroot-2021.02.8.tar.bz2 $ cd buildroot-2021.02.8
まずは、できることの確認
$ make help
Cleaning:
clean - delete all files created by build
distclean - delete all non-source files (including .config)
Build:
all - make world
toolchain - build toolchain
sdk - build relocatable SDK
Configuration:
menuconfig - interactive curses-based configurator
nconfig - interactive ncurses-based configurator
xconfig - interactive Qt-based configurator
gconfig - interactive GTK-based configurator
oldconfig - resolve any unresolved symbols in .config
syncconfig - Same as oldconfig, but quietly, additionally update deps
olddefconfig - Same as syncconfig but sets new symbols to their default value
randconfig - New config with random answer to all options
defconfig - New config with default answer to all options;
BR2_DEFCONFIG, if set on the command line, is used as input
savedefconfig - Save current config to BR2_DEFCONFIG (minimal config)
update-defconfig - Same as savedefconfig
allyesconfig - New config where all options are accepted with yes
allnoconfig - New config where all options are answered with no
alldefconfig - New config where all options are set to default
randpackageconfig - New config with random answer to package options
allyespackageconfig - New config where pkg options are accepted with yes
allnopackageconfig - New config where package options are answered with no
Package-specific:
<pkg> - Build and install <pkg> and all its dependencies
<pkg>-source - Only download the source files for <pkg>
<pkg>-extract - Extract <pkg> sources
<pkg>-patch - Apply patches to <pkg>
<pkg>-depends - Build <pkg>'s dependencies
<pkg>-configure - Build <pkg> up to the configure step
<pkg>-build - Build <pkg> up to the build step
<pkg>-show-info - generate info about <pkg>, as a JSON blurb
<pkg>-show-depends - List packages on which <pkg> depends
<pkg>-show-rdepends - List packages which have <pkg> as a dependency
<pkg>-show-recursive-depends
- Recursively list packages on which <pkg> depends
<pkg>-show-recursive-rdepends
- Recursively list packages which have <pkg> as a dependency
<pkg>-graph-depends - Generate a graph of <pkg>'s dependencies
<pkg>-graph-rdepends - Generate a graph of <pkg>'s reverse dependencies
<pkg>-dirclean - Remove <pkg> build directory
<pkg>-reconfigure - Restart the build from the configure step
<pkg>-rebuild - Restart the build from the build step
<pkg>-reinstall - Restart the build from the install step
Documentation:
manual - build manual in all formats
manual-html - build manual in HTML
manual-split-html - build manual in split HTML
manual-pdf - build manual in PDF
manual-text - build manual in text
manual-epub - build manual in ePub
graph-build - generate graphs of the build times
graph-depends - generate graph of the dependency tree
graph-size - generate stats of the filesystem size
list-defconfigs - list all defconfigs (pre-configured minimal systems)
Miscellaneous:
source - download all sources needed for offline-build
external-deps - list external packages used
legal-info - generate info about license compliance
show-info - generate info about packages, as a JSON blurb
pkg-stats - generate info about packages as JSON and HTML
printvars - dump internal variables selected with VARS=...
make V=0|1 - 0 => quiet build (default), 1 => verbose build
make O=dir - Locate all output files in "dir", including .config
For further details, see README, generate the Buildroot manual, or consult
it on-line at http://buildroot.org/docs.html
ビルド対象の確認
$ make list-defconfigs | grep raspberry raspberrypi0_defconfig - Build for raspberrypi0 raspberrypi0w_defconfig - Build for raspberrypi0w raspberrypi2_defconfig - Build for raspberrypi2 raspberrypi3_64_defconfig - Build for raspberrypi3_64 raspberrypi3_defconfig - Build for raspberrypi3 raspberrypi3_qt5we_defconfig - Build for raspberrypi3_qt5we raspberrypi4_64_defconfig - Build for raspberrypi4_64 raspberrypi4_defconfig - Build for raspberrypi4 raspberrypi_defconfig - Build for raspberrypi
今回は、 Raspberry Pi 3B+ なので
$ make raspberrypi3_defconfig
今回は、SSHログインを使用したいので、sshサーバの省メモリ版の dropbear を導入する。
$ make menuconfig
Target packages --->
Networking applications --->
[*] dropbear
説明文
BR2_PACKAGE_DROPBEAR: a small ssh 2 server designed for small memory environments. Note that dropbear requires a per-device unique host key. The key will be generated when dropbear starts, but it is not persistent over reboot (if you have a read-only rootfs) or upgrade (if you have a read-write rootfs). To make the key persistent, replace /etc/dropbear with a symlink to a directory on a persistent, writeable filesystem. Alternatively, mount a persistent unionfs over your root filesystem. https://matt.ucc.asn.au/dropbear/dropbear.html
ログインが root になるので、パスワードの設定
System configuration --->
(rPi3pAss) Root password
あまり、捻りはないがパスワードは「rPi3pAss」としてビルド
$ make all
下記のようなメッセージが出力されればビルド完了
INFO: hdimage(sdcard.img): adding partition 'boot' (in MBR) from 'boot.vfat' ... INFO: hdimage(sdcard.img): adding partition 'rootfs' (in MBR) from 'rootfs.ext4' ... INFO: hdimage(sdcard.img): writing MBR
速いマシンなら数十分の作業。
ちなみに
カーネルの構成を修正するなら
$ make linux-menuconfig
busyboxの構成を修正するなら
$ make busybox-menuconfig
生成された SDイメージは output/images/sdcard.img
今回は 153Mバイトほど
$ ls -lh output/images/sdcard.img -rw-r--r-- 1 developer developer 153M 1月 14 07:43 output/images/sdcard.img
SDへの書き込み
$ sudo dd bs=4M if=output/images/sdcard.img of=/dev/sdb status=progress conv=fsync $ sync
# dmesg [ 0.000000] Booting Linux on physical CPU 0x0 [ 0.000000] Linux version 5.10.1-v7 (developer@debian) (arm-buildroot-linux-uclibcgnueabihf-gcc.br_real (Buildroot 2021.02.8) 9.4.0, GNU ld (GNU Binutils) 2.35.2) #1 SMP Thu Jan 13 20:54:17 JST 2022 [ 0.000000] CPU: ARMv7 Processor [410fd034] revision 4 (ARMv7), cr=10c5383d [ 0.000000] CPU: div instructions available: patching division code [ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache [ 0.000000] OF: fdt: Machine model: Raspberry Pi 3 Model B Plus Rev 1.3 [ 0.000000] Memory policy: Data cache writealloc [ 0.000000] Reserved memory: created CMA memory pool at 0x35c00000, size 64 MiB [ 0.000000] OF: reserved mem: initialized node linux,cma, compatible id shared-dma-pool [ 0.000000] Zone ranges: [ 0.000000] DMA [mem 0x0000000000000000-0x0000000039bfffff] [ 0.000000] Normal empty [ 0.000000] Movable zone start for each node [ 0.000000] Early memory node ranges [ 0.000000] node 0: [mem 0x0000000000000000-0x0000000039bfffff] [ 0.000000] Initmem setup node 0 [mem 0x0000000000000000-0x0000000039bfffff] [ 0.000000] On node 0 totalpages: 236544 [ 0.000000] DMA zone: 2079 pages used for memmap [ 0.000000] DMA zone: 0 pages reserved [ 0.000000] DMA zone: 236544 pages, LIFO batch:63 [ 0.000000] percpu: Embedded 20 pages/cpu s50572 r8192 d23156 u81920 [ 0.000000] pcpu-alloc: s50572 r8192 d23156 u81920 alloc=20*4096 [ 0.000000] pcpu-alloc: [0] 0 [0] 1 [0] 2 [0] 3 [ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 234465 [ 0.000000] Kernel command line: coherent_pool=1M 8250.nr_uarts=1 snd_bcm2835.enable_compat_alsa=0 snd_bcm2835.enable_hd mi=1 bcm2708_fb.fbwidth=720 bcm2708_fb.fbheight=480 bcm2708_fb.fbswap=1 vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000 root=/dev/mmcblk0p2 rootwait console=tty1 console=ttyAMA0,115200 [ 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: 854448K/946176K available (10240K kernel code, 1310K rwdata, 2964K rodata, 1024K init, 860K bss, 261 92K reserved, 65536K cma-reserved) [ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1 [ 0.000000] ftrace: allocating 31783 entries in 63 pages [ 0.000000] ftrace: allocated 63 pages with 6 groups [ 0.000000] rcu: Hierarchical RCU implementation. [ 0.000000] Rude variant of Tasks RCU enabled. [ 0.000000] Tracing variant of 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] random: get_random_bytes called from start_kernel+0x3b0/0x598 with crng_init=0 [ 0.000000] arch_timer: cp15 timer(s) running at 19.20MHz (phys). [ 0.000000] clocksource: arch_sys_counter: mask: 0xffffffffffffff max_cycles: 0x46d987e47, max_idle_ns: 440795202767 ns [ 0.000008] sched_clock: 56 bits at 19MHz, resolution 52ns, wraps every 4398046511078ns [ 0.000024] Switching to timer-based delay loop, resolution 52ns [ 0.000309] Console: colour dummy device 80x30 [ 0.001102] printk: console [tty1] enabled [ 0.001173] Calibrating delay loop (skipped), value calculated using timer frequency.. 38.40 BogoMIPS (lpj=192000) [ 0.001232] pid_max: default: 32768 minimum: 301 [ 0.001454] LSM: Security Framework initializing [ 0.001711] Mount-cache hash table entries: 2048 (order: 1, 8192 bytes, linear) [ 0.001762] Mountpoint-cache hash table entries: 2048 (order: 1, 8192 bytes, linear) [ 0.003320] Disabling memory control group subsystem [ 0.003459] CPU: Testing write buffer coherency: ok [ 0.003960] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000 [ 0.004957] Setting up static identity map for 0x100000 - 0x10003c [ 0.005183] rcu: Hierarchical SRCU implementation. [ 0.006110] smp: Bringing up secondary CPUs ... [ 0.007281] CPU1: thread -1, cpu 1, socket 0, mpidr 80000001 [ 0.008564] CPU2: thread -1, cpu 2, socket 0, mpidr 80000002 [ 0.009771] CPU3: thread -1, cpu 3, socket 0, mpidr 80000003 [ 0.010012] smp: Brought up 1 node, 4 CPUs [ 0.010045] SMP: Total of 4 processors activated (153.60 BogoMIPS). [ 0.010077] CPU: All CPU(s) started in HYP mode. [ 0.010105] CPU: Virtualization extensions available. [ 0.011073] devtmpfs: initialized [ 0.028439] VFP support v0.3: implementor 41 architecture 3 part 40 variant 3 rev 4 [ 0.029061] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns [ 0.029123] futex hash table entries: 1024 (order: 4, 65536 bytes, linear) [ 0.032377] pinctrl core: initialized pinctrl subsystem [ 0.033589] NET: Registered protocol family 16 [ 0.037616] DMA: preallocated 1024 KiB pool for atomic coherent allocations [ 0.043411] audit: initializing netlink subsys (disabled) [ 0.043752] audit: type=2000 audit(0.040:1): state=initialized audit_enabled=0 res=1 [ 0.044335] thermal_sys: Registered thermal governor 'step_wise' [ 0.045227] hw-breakpoint: found 5 (+1 reserved) breakpoint and 4 watchpoint registers. [ 0.045290] hw-breakpoint: maximum watchpoint size is 8 bytes. [ 0.045578] Serial: AMBA PL011 UART driver [ 0.064389] bcm2835-mbox 3f00b880.mailbox: mailbox enabled [ 0.080162] raspberrypi-firmware soc:firmware: Attached to firmware from 2020-12-15T18:34:30, variant start [ 0.090174] raspberrypi-firmware soc:firmware: Firmware hash is 4b4aff21f72c5b9ba39d83c7b0f8fa910a6ef99b [ 0.139488] bcm2835-dma 3f007000.dma: DMA legacy API manager, dmachans=0x1 [ 0.142058] SCSI subsystem initialized [ 0.142330] usbcore: registered new interface driver usbfs [ 0.142430] usbcore: registered new interface driver hub [ 0.142577] usbcore: registered new device driver usb [ 0.144451] clocksource: Switched to clocksource arch_sys_counter [ 1.753351] VFS: Disk quotas dquot_6.6.0 [ 1.753494] VFS: Dquot-cache hash table entries: 1024 (order 0, 4096 bytes) [ 1.753728] FS-Cache: Loaded [ 1.754014] CacheFiles: Loaded [ 1.765256] NET: Registered protocol family 2 [ 1.766200] tcp_listen_portaddr_hash hash table entries: 512 (order: 0, 6144 bytes, linear) [ 1.766288] TCP established hash table entries: 8192 (order: 3, 32768 bytes, linear) [ 1.766439] TCP bind hash table entries: 8192 (order: 4, 65536 bytes, linear) [ 1.766653] TCP: Hash tables configured (established 8192 bind 8192) [ 1.766839] UDP hash table entries: 512 (order: 2, 16384 bytes, linear) [ 1.766918] UDP-Lite hash table entries: 512 (order: 2, 16384 bytes, linear) [ 1.767381] NET: Registered protocol family 1 [ 1.768253] RPC: Registered named UNIX socket transport module. [ 1.768288] RPC: Registered udp transport module. [ 1.768317] RPC: Registered tcp transport module. [ 1.768347] RPC: Registered tcp NFSv4.1 backchannel transport module. [ 1.769922] hw perfevents: enabled with armv7_cortex_a7 PMU driver, 7 counters available [ 1.773719] Initialise system trusted keyrings [ 1.774000] workingset: timestamp_bits=14 max_order=18 bucket_order=4 [ 1.783668] zbud: loaded [ 1.785813] FS-Cache: Netfs 'nfs' registered for caching [ 1.786729] NFS: Registering the id_resolver key type [ 1.786798] Key type id_resolver registered [ 1.786828] Key type id_legacy registered [ 1.787003] nfs4filelayout_init: NFSv4 File Layout Driver Registering... [ 1.788182] Key type asymmetric registered [ 1.788216] Asymmetric key parser 'x509' registered [ 1.788291] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 249) [ 1.788332] io scheduler mq-deadline registered [ 1.788363] io scheduler kyber registered [ 1.791785] bcm2708_fb soc:fb: FB found 1 display(s) [ 1.805404] Console: switching to colour frame buffer device 90x30 [ 1.813987] bcm2708_fb soc:fb: Registered framebuffer for display 0, size 720x480 [ 1.820476] Serial: 8250/16550 driver, 1 ports, IRQ sharing enabled [ 1.826272] bcm2835-rng 3f104000.rng: hwrng registered [ 1.829629] vc-mem: phys_addr:0x00000000 mem_base=0x3ec00000 mem_size:0x40000000(1024 MiB) [ 1.836604] gpiomem-bcm2835 3f200000.gpiomem: Initialised: Registers at 0x3f200000 [ 1.853196] brd: module loaded [ 1.868546] loop: module loaded [ 1.873204] Loading iSCSI transport class v2.0-870. [ 1.878072] libphy: Fixed MDIO Bus: probed [ 1.881448] usbcore: registered new interface driver lan78xx [ 1.884747] usbcore: registered new interface driver smsc95xx [ 1.887780] dwc_otg: version 3.00a 10-AUG-2012 (platform bus) [ 2.619055] Core Release: 2.80a [ 2.622060] Setting default values for core params [ 2.625178] Finished setting default values for core params [ 2.828629] Using Buffer DMA mode [ 2.831622] Periodic Transfer Interrupt Enhancement - disabled [ 2.834714] Multiprocessor Interrupt Enhancement - disabled [ 2.837764] OTG VER PARAM: 0, OTG VER FLAG: 0 [ 2.840740] Dedicated Tx FIFOs mode [ 2.844264] [ 2.844285] WARN::dwc_otg_hcd_init:1072: FIQ DMA bounce buffers: virt = b5d14000 dma = 0xf5d14000 len=9024 [ 2.853262] FIQ FSM acceleration enabled for : [ 2.853262] Non-periodic Split Transactions [ 2.853262] Periodic Split Transactions [ 2.853262] High-Speed Isochronous Endpoints [ 2.853262] Interrupt/Control Split Transaction hack enabled [ 2.867510] dwc_otg: Microframe scheduler enabled [ 2.867581] [ 2.867591] WARN::hcd_init_fiq:457: FIQ on core 1 [ 2.872715] [ 2.872725] WARN::hcd_init_fiq:458: FIQ ASM at 807cb66c length 36 [ 2.877899] [ 2.877908] WARN::hcd_init_fiq:496: MPHI regs_base at ba010000 [ 2.883178] dwc_otg 3f980000.usb: DWC OTG Controller [ 2.885977] dwc_otg 3f980000.usb: new USB bus registered, assigned bus number 1 [ 2.888816] dwc_otg 3f980000.usb: irq 89, io mem 0x00000000 [ 2.891597] Init: Port Power? op_state=1 [ 2.894315] Init: Power Port (0) [ 2.897347] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.10 [ 2.902849] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [ 2.905786] usb usb1: Product: DWC OTG Controller [ 2.908665] usb usb1: Manufacturer: Linux 5.10.1-v7 dwc_otg_hcd [ 2.911586] usb usb1: SerialNumber: 3f980000.usb [ 2.915287] hub 1-0:1.0: USB hub found [ 2.918188] hub 1-0:1.0: 1 port detected [ 2.921933] dwc_otg: FIQ enabled [ 2.921946] dwc_otg: NAK holdoff enabled [ 2.921958] dwc_otg: FIQ split-transaction FSM enabled [ 2.921976] Module dwc_common_port init [ 2.922329] usbcore: registered new interface driver usb-storage [ 2.925354] mousedev: PS/2 mouse device common for all mice [ 2.929355] bcm2835-wdt bcm2835-wdt: Broadcom BCM2835 watchdog timer [ 2.935223] sdhci: Secure Digital Host Controller Interface driver [ 2.938171] sdhci: Copyright(c) Pierre Ossman [ 2.941677] mmc-bcm2835 3f300000.mmcnr: could not get clk, deferring probe [ 2.945391] sdhost-bcm2835 3f202000.mmc: could not get clk, deferring probe [ 2.948666] sdhci-pltfm: SDHCI platform and OF driver helper [ 2.953491] ledtrig-cpu: registered to indicate activity on CPUs [ 2.957065] hid: raw HID events driver (C) Jiri Kosina [ 2.960283] usbcore: registered new interface driver usbhid [ 2.963345] usbhid: USB HID core driver [ 2.970863] Initializing XFRM netlink socket [ 2.973925] NET: Registered protocol family 17 [ 2.977089] Key type dns_resolver registered [ 2.980555] Registering SWP/SWPB emulation handler [ 2.983691] registered taskstats version 1 [ 2.986627] Loading compiled-in X.509 certificates [ 2.990319] Key type ._fscrypt registered [ 2.993055] Key type .fscrypt registered [ 2.995740] Key type fscrypt-provisioning registered [ 3.009455] uart-pl011 3f201000.serial: there is not valid maps for state default [ 3.012477] uart-pl011 3f201000.serial: cts_event_workaround enabled [ 3.015406] 3f201000.serial: ttyAMA0 at MMIO 0x3f201000 (irq = 114, base_baud = 0) is a PL011 rev2 [ 4.058186] printk: console [ttyAMA0] enabled [ 4.068600] 3f215040.serial: ttyS0 at MMIO 0x3f215040 (irq = 86, base_baud = 50000000) is a 16550 [ 4.084388] bcm2835-power bcm2835-power: Broadcom BCM2835 power domains driver [ 4.096483] mmc-bcm2835 3f300000.mmcnr: mmc_debug:0 mmc_debug2:0 [ 4.105605] mmc-bcm2835 3f300000.mmcnr: DMA channel allocated [ 4.141114] sdhost: log_buf @ (ptrval) (f5d13000) [ 4.186553] mmc1: queuing unknown CIS tuple 0x80 (2 bytes) [ 4.195085] mmc0: sdhost-bcm2835 loaded - DMA enabled (>1) [ 4.206576] of_cfs_init [ 4.212054] of_cfs_init: OK [ 4.218744] uart-pl011 3f201000.serial: no DMA platform data [ 4.224644] Indeed it is in host mode hprt0 = 00021501 [ 4.232848] Waiting for root device /dev/mmcblk0p2... [ 4.295414] mmc1: queuing unknown CIS tuple 0x80 (3 bytes) [ 4.305529] mmc1: queuing unknown CIS tuple 0x80 (3 bytes) [ 4.314152] random: fast init done [ 4.325528] mmc1: queuing unknown CIS tuple 0x80 (7 bytes) [ 4.355987] mmc0: host does not support reading read-only switch, assuming write-enable [ 4.370469] mmc0: new high speed SD card at address b368 [ 4.379988] mmcblk0: mmc0:b368 UD 1.90 GiB [ 4.390597] mmcblk0: p1 p2 [ 4.434385] EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null) [ 4.439277] mmc1: new high speed SDIO card at address 0001 [ 4.448551] VFS: Mounted root (ext4 filesystem) readonly on device 179:2. [ 4.457116] usb 1-1: new high-speed USB device number 2 using dwc_otg [ 4.467726] devtmpfs: mounted [ 4.477204] Indeed it is in host mode hprt0 = 00001101 [ 4.552351] Freeing unused kernel memory: 1024K [ 4.560263] Run /sbin/init as init process [ 4.567226] with arguments: [ 4.567238] /sbin/init [ 4.567249] with environment: [ 4.567260] HOME=/ [ 4.567271] TERM=linux [ 4.734834] usb 1-1: New USB device found, idVendor=0424, idProduct=2514, bcdDevice= b.b3 [ 4.749031] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 4.760155] hub 1-1:1.0: USB hub found [ 4.767193] hub 1-1:1.0: 4 ports detected [ 4.917586] EXT4-fs (mmcblk0p2): re-mounted. Opts: (null) [ 5.051218] random: dd: uninitialized urandom read (512 bytes read) [ 5.094559] usb 1-1.1: new high-speed USB device number 3 using dwc_otg [ 5.244886] usb 1-1.1: New USB device found, idVendor=0424, idProduct=2514, bcdDevice= b.b3 [ 5.259975] usb 1-1.1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 5.271952] hub 1-1.1:1.0: USB hub found [ 5.279415] hub 1-1.1:1.0: 3 ports detected [ 5.362424] NET: Registered protocol family 10 [ 5.371657] Segment Routing with IPv6 [ 5.639903] dwc_otg_handle_wakeup_detected_intr lxstate = 2 [ 6.074502] usb 1-1.1.1: new high-speed USB device number 4 using dwc_otg [ 6.214999] usb 1-1.1.1: New USB device found, idVendor=0424, idProduct=7800, bcdDevice= 3.00 [ 6.230009] usb 1-1.1.1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 6.506353] lan78xx 1-1.1.1:1.0 (unnamed net_device) (uninitialized): No External EEPROM. Setting MAC Speed [ 6.524743] libphy: lan78xx-mdiobus: probed [ 6.641518] lan78xx 1-1.1.1:1.0 (unnamed net_device) (uninitialized): int urb period 64 [ 7.475452] random: mktemp: uninitialized urandom read (6 bytes read) [ 8.462388] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready [ 10.902837] random: mktemp: uninitialized urandom read (6 bytes read) [ 24.259146] random: crng init done #
電源を切る前は忘れずに
# poweroff
