[メモ] Raspberry Pi 2で、buildrootを使う
- Buildは、Ubuntu 14.04(x86_64)
- Raspberry Pi 2
- UART console (UARTケーブルでWinと接続、TeraTermでコンソール使用)
buildroot-2015.11.1- Realtek8192cuベースのUSBドングル
ダウンロード、展開、デフォルトのコンフィグレーション
wget http://buildroot.uclibc.org/downloads/buildroot-2015.11.1.tar.bz2
tar xf ./buildroot-2015.11.1.tar.bz2
cd buildroot-2015.11.1
make raspberrypi2_defconfig
make raspberrypi_defconfigで、RasberryPi1用ができるハズ。
Configuration(buildroot)
% make menuconfig
- UARTを使う。(ttyAMA0)
-
System configuration --->=>[*] Run a getty (login prompt) after boot --->から
-
│ │ --- Run a getty (login prompt) after boot │ │
│ │ (ttyAMA0) TTY port │ │
│ │ Baudrate (115200) ---> │ │
│ │ (vt100) TERM environment variable │ │
│ │ () other options to pass to getty │ │
- initramfsはカーネルに含めてしまう。
-
Filesystem images --->から
-
│ │ [ ] axfs root filesystem │ │
│ │ [ ] cloop root filesystem for the target device │ │
│ │ -*- cpio the root filesystem (for use as an initial RAM filesystem) │ │
│ │ Compression method (bzip2) ---> │ │
│ │ [ ] Create U-Boot image of the root filesystem │ │
│ │ [ ] cramfs root filesystem │ │
│ │ [ ] ext2/3/4 root filesystem │ │
│ │ [*] initial RAM filesystem linked into linux kernel │ │
│ │ [ ] jffs2 root filesystem │ │
│ │ [ ] romfs root filesystem │ │
│ │ [ ] squashfs root filesystem │ │
│ │ [ ] tar the root filesystem │ │
│ │ [ ] ubifs root filesystem │ │
│ │ [ ] yaffs2 root filesystem │ │
Configuration (linux kernel)
% make linux-menuconfig
=> カーネルの設定ができる
make ... 待つ。
- binutilsとか、gccとかダウンロードしてきて、ビルドする。
- =>
buildroot-2015.11.1-1/output/images/フォルダの下に生成物ができる。
% tree buildroot-2015.11.1/output/images/
buildroot-2015.11.1/output/images/
├── bcm2709-rpi-2-b.dtb
├── rootfs.cpio
├── rootfs.cpio.bz2
├── rpi-firmware
│ ├── bootcode.bin
│ ├── cmdline.txt
│ ├── config.txt
│ ├── fixup.dat
│ └── start.elf
└── zImage
起動SDカードの準備
- SDカードフォーマッターでフォーマット。=>FAT(FAT32)のみでOK.
- SDカードにイメージをコピー
-
rpi-firmware/*を SDのルートへ -
bcm2709-rpi-2-b.dtbを SDのルートへ -
zImageを SDのルートへ -
rootfs.cpioとrootfs.cpio.bz2はコピーしない
-
SD:/
├── bcm2709-rpi-2-b.dtb
├── bootcode.bin
├── cmdline.txt
├── config.txt
├── fixup.dat
├── start.elf
└── zImage
-
cmdline.txtを編集- consoleをUARTへ出力。
- 起動後のルートは、カーネルにくっついてるイメージがramに展開されて、使用されるので、
root=は指定してない。
cmdline.txt
console=ttyAMA0,115200
実機でブート
- Windows機にUARTでつないで、TeraTerm-115200bpsで待機。
- SDをいれて、PowerON
-
rootパスなしで、ログイン。
ncompressing Linux... done, booting the kernel.
[ 0.000000] Booting Linux on physical CPU 0xf00
[ 0.000000] Initializing cgroup subsys cpuset
[ 0.000000] Initializing cgroup subsys cpu
[ 0.000000] Initializing cgroup subsys cpuacct
[ 0.000000] Linux version 4.1.5-v7 (user01@adas-sandbox) (gcc version 4.9.3 (Buildroot 2015.11.1) ) #2 SMP PREEMPT Fri Dec 18 16:39:25 PST 2015
[ 0.000000] CPU: ARMv7 Processor [410fc075] revision 5 (ARMv7), cr=10c5387d
[ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
[ 0.000000] Machine: BCM2709
...
...
[ 3.622694] uart-pl011 dev:f1: no DMA platform data
[ 3.631491] mmc0: host does not support reading read-only switch, assuming write-enable
[ 3.641587] mmc0: new high speed SDHC card at address 0001
[ 3.647762] mmcblk0: mmc0:0001 00000 29.8 GiB
[ 3.652824] Freeing unused kernel memory: 15264K (80788000 - 81670000)
[ 3.654373] Indeed it is in host mode hprt0 = 00021501
[ 3.664260] mmcblk0: p1
Starting logging: OK
Initializing random number generator... [ 3.746711] random: dd urandom read with 4 bits of entropy available
done.
Starting network...
[ 3.834216] usb 1-1: new high-speed USB device number 2 using dwc_otg
[ 3.840852] Indeed it is in host mode hprt0 = 00001101
Welcome to Buildroot
buildroot login: [ 4.044583] usb 1-1: New USB device found, idVendor=0424, idProduct=9514
[ 4.051291] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 4.059347] hub 1-1:1.0: USB hub found
[ 4.063217] hub 1-1:1.0: 5 ports detected
[ 4.344194] usb 1-1.1: new high-speed USB device number 3 using dwc_otg
[ 4.464528] usb 1-1.1: New USB device found, idVendor=0424, idProduct=ec00
[ 4.471404] usb 1-1.1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 4.481756] smsc95xx v1.0.4
[ 4.548378] smsc95xx 1-1.1:1.0 eth0: register 'smsc95xx' at usb-bcm2708_usb-1.1, smsc95xx USB 2.0 Ethernet, b8:27:eb:e0:02:5a
Welcome to Buildroot
buildroot login: root
# ls -l /
total 4
drwxr-xr-x 2 root root 1420 Dec 19 2015 bin
drwxr-xr-x 7 root root 2560 Jan 1 00:00 dev
drwxr-xr-x 6 root root 460 Jan 1 00:00 etc
-rwxr-xr-x 1 root root 176 Dec 19 2015 init
drwxr-xr-x 4 root root 600 Dec 19 2015 lib
lrwxrwxrwx 1 root root 3 Dec 19 2015 lib32 -> lib
lrwxrwxrwx 1 root root 11 Dec 19 2015 linuxrc -> bin/busybox
drwxr-xr-x 2 root root 40 Dec 5 2015 media
drwxr-xr-x 2 root root 40 Dec 5 2015 mnt
drwxr-xr-x 2 root root 40 Dec 5 2015 opt
dr-xr-xr-x 67 root root 0 Jan 1 00:00 proc
drwx------ 2 root root 60 Jan 1 00:00 root
drwxr-xr-x 3 root root 140 Jan 1 00:00 run
drwxr-xr-x 2 root root 1040 Dec 19 2015 sbin
dr-xr-xr-x 11 root root 0 Jan 1 00:00 sys
drwxrwxrwt 2 root root 60 Jan 1 00:00 tmp
drwxr-xr-x 6 root root 140 Dec 19 2015 usr
drwxr-xr-x 4 root root 200 Dec 19 2015 var
#
追加パッケージ
% make menuconfigから、Target packages --->へ、いくとパッケージの追加ができる。
wifi を使う。
- Realtek8192cuベースのUSBドングル
- wifi関連のtoolをいれる。
-
Target packages --->Networking applications --->から、iw,wireless tools,wpa_supplicant関連を選択。
| | [ ] iputils | |
| | *** irssi needs a toolchain w/ wchar, threads *** | |
| | [*] iw | |
| | *** janus-gateway needs a toolchain w/ dynamic library, threads, wchar *** | |
| | [ ] kismet | |
...
...
| | [*] wireless tools | |
| | [ ] Install shared library | |
| | *** wireshark needs a toolchain w/ wchar, threads *** | |
| | [*] wpa_supplicant | |
| | [*] Enable nl80211 support | |
| | [*] Enable AP mode | |
| | [*] Enable EAP | |
| | [*] Enable HS20 | |
| | [*] Enable syslog support | |
| | [*] Enable WPS | |
| | [*] Install wpa_cli binary | |
| | [*] Install wpa_passphrase binary | |
| | [ ] wvdial | |
-
makeしたら、zImageのみSDへコピーする。
- モジュールのロード
/lib/modules/から検索。 -
ifconfig wlan0 upして、iwlist scan -
wpa_passphraseで、/etc/wpa_supplicant.confに情報追加。 -
wpa_supplicantで、接続 -
udhcpで ip取得
Welcome to Buildroot
buildroot login: root
# find . /lib/modules/ | grep 8192cu.ko
/lib/modules/4.1.5-v7/kernel/drivers/net/wireless/rtl8192cu/8192cu.ko
# insmod /lib/modules/4.1.5-v7/kernel/drivers/net/wireless/rtl8192cu/8192cu.ko
[ 80.737115] usbcore: registered new interface driver rtl8192cu
# lsmod
Module Size Used by Not tainted
8192cu 509748 0
# iwlist scan
wlan0 No scan results
lo Interface doesn't support scanning.
eth0 Interface doesn't support scanning.
# ifconfig wlan0 up
# iwlist scan
...ずらずらでてくる...
# wpa_passphrase 'SSID' 'Password' >> /etc/wpa_supplicant.conf
# wpa_supplicant -B w -D wext -i wlan0 -c /etc/wpa_supplicant.conf -dd
...ずらずらでてくる...
# iwconfig
wlan0 IEEE 802.11bgn ESSID:"SSIDがでてる" Nickname:"<WIFI@REALTEK>"
# udhcpc -i wlan0
udhcpc (v1.24.1) started
Sending discover...
...ずらずら...
# ping www.google.com
PING www.google.com (74.125.239.48): 56 data bytes
64 bytes from 74.125.239.48: seq=0 ttl=44 time=17.263 ms
64 bytes from 74.125.239.48: seq=1 ttl=44 time=44.928 ms
64 bytes from 74.125.239.48: seq=2 ttl=44 time=11.501 ms
^C
--- www.google.com ping statistics ---
3 packets transmitted, 3 packets received, 0% packet loss
round-trip min/avg/max = 11.501/24.564/44.928 ms
#