6、Google TPU 入手教程

最近获得一块Google TPU ，简单介绍一下启动过程：具体参考手册：

https://coral.withgoogle.com/resources/ 

https://www.mrtbc.com/318.html

1、首先，在宿主主机（PC）安装（exfat-fuse 后期识别SD卡做准备）：

sudo apt-get install screen fastboot minicom exfat-fuse

其实官方手册中的screen，应该和minicon串口工具类似；

2、然后查看一下是否安装成功

screen --version

Screen version 4.03.01 (GNU) 28-Jun-15

fastboot --version

fastboot version debian

3、因为需要对新的开发板TPU进行一次刷机操作，所以首先需要在宿主机安装驱动程序；

sudo sh -c "echo 'SUBSYSTEM=="usb", ATTR{idVendor}=="0525", MODE="0664",GROUP="plugdev", TAG+="uaccess"' >> /etc/udev/rules.d/65-edgetpu-board.rules"

4、然后创建新的链接，使其生效

sudo udevadm control --reload-rules && udevadm trigger

5、然后设置新的开发板TPU进行一次刷机操作，所以需要预先设置刷机的方式（类似zedboard刷机）

设置完硬件的刷机方式之后，然后就可以串口读取信息了；

6、然后连接串口线，打开串口监控程序即可；（注 先不要插电，因为，稍后插电，就可以打印的启动过程uboot读取硬件的信息）

7、查看宿主机连接的USB接口名称

dmesg | grep ttyUSB

[534605.535179] usb 1-3: cp210x converter now attached to ttyUSB0
[534605.536907] usb 1-3: cp210x converter now attached to ttyUSB1
[534734.937608] cp210x ttyUSB0: cp210x converter now disconnected from ttyUSB0
[534734.938263] cp210x ttyUSB1: cp210x converter now disconnected from ttyUSB1
[537639.540031] usb 1-3: cp210x converter now attached to ttyUSB0
[537639.542614] usb 1-3: cp210x converter now attached to ttyUSB1
[537757.868380] cp210x ttyUSB0: cp210x converter now disconnected from ttyUSB0
[537757.869118] cp210x ttyUSB1: cp210x converter now disconnected from ttyUSB1
[546225.024362] usb 1-3: cp210x converter now attached to ttyUSB0
[546225.026140] usb 1-3: cp210x converter now attached to ttyUSB1

8、查看到[534734.937608] cp210x ttyUSB0: cp210x converter now disconnected from ttyUSB0
然后输入 下面命令进行串口监控或者使用mincom监控

sudo screen /dev/ttyUSB0 115200  

或者使用minicom,这是本人开机启动后，minicom的信息；（minicom配置很简单，可以参考：https://jingyan.baidu.com/article/6b182309f9dd6dba59e1597a.html），本人使用minicom，

只需把port配置成/dev/ttyUSB0 即可；

Hardware Flow Contorl选项改成No；

相比而言，minicom 比较好用，因为每次监听串口 只需一条命令即可，然而screen 还需记住设备名和波特率～～～

sudo minicom

9、连接电源之后，（不要使用计算机给开发板供电，会供电不足 ）在屏幕显示信息如下；

Welcome to minicom 2.7

OPTIONS: I18n 
Compiled on Nov 15 2018, 20:18:47.
Port /dev/ttyUSB0, 18:42:48

Press CTRL-A Z for help on special keys


U-Boot SPL 2017.03 (Dec 06 2018 - 19:26:58)
power_bd71837_init
pmic debug: name=BD71837
check ddr4_pmu_train_imem code
check ddr4_pmu_train_imem code pass
check ddr4_pmu_train_dmem code
check ddr4_pmu_train_imem code pass
check ddr4_pmu_train_dmem code
check ddr4_pmu_train_dmem code pass
Training PASS
Normal Boot
Trying to boot from MMC1

                                                                                
U-Boot 2017.03 (Dec 06 2018 - 19:26:58 +0000)                                   
                                                                                
CPU:   Freescale i.MX8MQ rev2.0 1500 MHz (running at 1000 MHz)                  
CPU:   Com at 32C                                                               
Reset cause: POR                                                                
Model: Freescale i.MX8MQ Phanbell                                               
DRAM:  1 GiB                                                                    
Board id: 6                                                                     
Baseboard id: 1                                                                 
MMC:   FSL_SDHC: 0, FSL_SDHC: 1                                                 
*** Warning - bad CRC, using default environment                                
                                                                                
In:    serial                                                                   
Out:   serial                                                                   
Err:   serial                                                                   
                                                                                
 BuildInfo:                                                                     
  - ATF                                                                         
  - U-Boot 2017.03                                                              
                                                                                
flash target is MMC:0                                                           
Net:                                                                            
Warning: ethernet@30be0000 using MAC address from ROM                           
eth0: ethernet@30be0000                                                         
Fastboot: Normal   
Hit any key to stop autoboot:  2 sh the latest firmware.                        
Please follow the instructions at g.co/coral/setup.                             
                                                                                
                                                                                
u-boot=> 
                 

10、然后插上白色的数据线（otg）

11、输入：（本人的好卡，我也不知为啥，输入好多次都错误，还是复制一步到位～～～）

fastboot 0

12、打开一个新终端界面（宿主机）

fastboot devices

提示如下表示成功，如果不提示，就是fastboot 版本太低 链接：https://pan.baidu.com/s/1EHe-2vvuxWTq6bn5gBNL8w 密码：u57y  

mkdir -p ~/.local/bin
sudo mv ~/platform-tools/fastboot ~/.local/bin/

ubuntu@ubuntu:~$ fastboot --version
fastboot version 28.0.2-5303910
Installed as /home/ubuntu/.local/bin/fastboot

ubuntu@ubuntu:~$ fastboot devices
170349d6ef944da7	fastboot
ubuntu@ubuntu:~$ 

13、然后下载百度云的 mendel-enterprise-chef-13.zip 然后进行刷机～～

ubuntu@ubuntu:~/mendel-enterprise-chef-13$ bash flash.sh 
Sending 'bootloader0' (1006 KB)                    OKAY [  0.051s]
Writing 'bootloader0'                              OKAY [  0.191s]
Finished. Total time: 0.261s
Rebooting into bootloader                          OKAY [  0.024s]
Finished. Total time: 0.125s
Sending 'gpt' (33 KB)                              OKAY [  0.017s]
Writing 'gpt'                                      OKAY [  0.308s]
Finished. Total time: 0.344s
Rebooting into bootloader                          OKAY [  0.022s]
Finished. Total time: 0.122s
Erasing 'misc'                                     OKAY [  0.072s]
Finished. Total time: 0.082s
Sending 'boot' (131072 KB)                         OKAY [  4.474s]
Writing 'boot'                                     OKAY [  3.628s]
Finished. Total time: 8.178s
Sending sparse 'rootfs' 1/3 (397265 KB)            OKAY [ 13.622s]
Writing 'rootfs'                                   OKAY [ 24.925s]
Sending sparse 'rootfs' 2/3 (408325 KB)            OKAY [ 14.008s]
Writing 'rootfs'                                   OKAY [ 46.386s]
Sending sparse 'rootfs' 3/3 (352960 KB)            OKAY [ 12.192s]
Writing 'rootfs'                                   OKAY [ 85.402s]
Finished. Total time: 196.586s
Rebooting                                          OKAY [  0.005s]
Finished. Total time: 0.105s
ubuntu@ubuntu:~/mendel-enterprise-chef-13$ 

然后刷完了。哈哈哈 然后屏幕有画面了～～～

然后就出来图形化界面了～～～～
14、然后插上网线，就可以愉快的访问TPU了，但是，突然发现ssh链接不上去，提示

Permission denied (publickey).

因为Google TPU默认禁用了ssh密码登录权限，此时你需要在串口中设置一下TPU配置即可；

打开 /etc/ssh/sshd_config 
修改PasswordAuthentication no 为：
PasswordAuthentication yes

重启服务
/etc/init.d/sshd restart

这样就好了，小组其它成员都可以通过网口命令ssh远程联接TPU设备了。

依次为TPU串口终端和ssh连接的命令行终端（都一样）

15、测试一下demo,进入TPU终端；

cd ~

wget https://dl.google.com/coral/canned_models/mobilenet_v2_1.0_224_inat_bird_quant_edgetpu.tflite 
wget https://dl.google.com/coral/canned_models/inat_bird_labels.txt 
wget https://www.mrtbc.com/wp-content/uploads/2019/05/parrot.jpg

然后执行命令；

mendel@tuned-ibis:~$ python3 /usr/lib/python3/dist-packages/edgetpu/demo/classify_image.py --model ~/mobilenet_v2_1.0_224_inat_bird_quant_edgetpu.tflite --label ~/inat_bird_labels.txt --image ~/parrot.jpg
---------------------------
Ara macao (Scarlet Macaw)
Score :  0.761719
mendel@tuned-ibis:~$ 

mendel@tuned-ibis:/etc/apt/sources.list.d$ ls
00-mdt-services.list  multistrap-bsp.list
coral-cloud.list      multistrap-main.list

需要更新一下源，否则哎～～China vs Google

deb http://mirrors.aliyun.com/debian stretch main contrib non-free
deb-src http://mirrors.aliyun.com/debian stretch main contrib non-free
deb http://mirrors.aliyun.com/debian stretch-updates main contrib non-free
deb-src http://mirrors.aliyun.com/debian stretch-updates main contrib non-free
deb http://mirrors.aliyun.com/debian-security stretch/updates main contrib non-free
deb-src http://mirrors.aliyun.com/debian-security stretch/updates main contrib non-free
deb http://ftp.cn.debian.org/debian/ stretch main contrib non-free
deb http://ftp.cn.debian.org/debian/ stretch-updates main contrib non-free
deb http://mirrors.ustc.edu.cn/debian-security/ stretch/updates main contrib non-free
deb http://ftp.cn.debian.org/debian/ stretch-backports main contrib non-free
​
deb http://mirrors.ustc.edu.cn/ubuntu-ports xenial-security main restricted
deb-src http://mirrors.ustc.edu.cn/ubuntu-ports xenial-security main restricted
deb http://mirrors.ustc.edu.cn/ubuntu-ports xenial-security universe
deb-src http://mirrors.ustc.edu.cn/ubuntu-ports xenial-security universe
deb http://mirrors.ustc.edu.cn/ubuntu-ports xenial-security multiverse
deb-src http://mirrors.ustc.edu.cn/ubuntu-ports xenial-security multiverse


​

进行源更新

sudo apt-get update

如果出现问题：如

Reading package lists... Done
W: GPG error: http://mirrors.ustc.edu.cn/ubuntu-ports xenial-security InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 40976EAF437D05B5 NO_PUBKEY 3B4FE6ACC0B21F32
W: The repository 'http://mirrors.ustc.edu.cn/ubuntu-ports xenial-security InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.

需要执行下面的命令：

sudo apt-get install debian-archive-keyring debian-keyring dirmngr//安上公钥 

然后执行：

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 40976EAF437D05B5 

重新更新数据源就可以了～～

在把TPU作为PC端时，突然发现其无法通过串口调试其它设备，即TPU不支持lsusb的使用～～

～～～然后发现这是debain系统的问题～～～

sudo apt-get install usbutils

ubuntu@ubuntu:~$ lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 105: ID 1a2c:2124 China Resource Semico Co., Ltd 
Bus 001 Device 104: ID 413c:301a Dell Computer Corp. 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

然后取得其串口的控制权限～～～

cd /etc/udev/rules.d/
sudo touch 51-android.rules 
SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", MODE="0666"
sudo chmod a+x 51-android.rules

拔掉usb重新插上就可以了，如：

ubuntu@ubuntu:~$ adb devices
List of devices attached 
AB100607    device

这样就解决了识别（控制）串口USB的问题。

 

在TPU上执行apt-get install命令时，报如下warning

 

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

perl: warning: Setting locale failed. perl: warning: Please check that your locale settings:         LANGUAGE = "zh_CN:zh",         LC_ALL = (unset),         LC_TIME = "zh_CN",         LC_MONETARY = "zh_CN",         LC_ADDRESS = "zh_CN",         LC_TELEPHONE = "zh_CN",         LC_NAME = "zh_CN",         LC_MEASUREMENT = "zh_CN",         LC_IDENTIFICATION = "zh_CN",         LC_NUMERIC = "zh_CN",         LC_PAPER = "zh_CN",         LANG = "zh_CN.UTF-8"     are supported and installed on your system. perl: warning: Falling back to the standard locale ("C"). locale: Cannot set LC_CTYPE to default locale: No such file or directory locale: Cannot set LC_MESSAGES to default locale: No such file or directory locale: Cannot set LC_ALL to default locale: No such file or directory

sudo vim  ~/.bashrc
#add the command in bottom line
export LC_ALL=C
source ~/.bashrc