Linux kernel, Android, Golang & Recsys

今天通过libusb访问一个HID的设备，一调用USBDEVFS_{CLAIMINTERFACE} ioctl就返回-1设备忙, 找了一下午原因也没有找到， 快到下班的时候， 发现了一篇文章Porting Libusb for Android on the Beagleboard in 5 steps 提到 需要把设备加载到usbfs上，结果加载了usbfs设备就能正常访问了。

在网上搜了一圈，发现libusb就是通过usbfs或usbdevfs来链接USB设备，所以在使用之前 必须加载usbfs到/dev/bus/usb或/proc/bus/usb目录. 原文如下:

libusb uses a pseudo-filesystem known as ‘usbdevfs` or ‘usbfs` to access
the USB devices connected to your machine. This filesystem must be mounted
under /proc/bus/usb for libusb to work.

libusb移植到Android具体可以参考Porting Libusb for Android on the Beagleboard in 5 steps

需要注意的是:

• 在命令行加载sysfs需要执行:
  • mount -t usbfs -o devmode=666 none /proc/bus/usb
• 在init.rc中需要使用:
  • mount usbfs none /proc/bus/usb -o devmode=0666

参考

• libusb
• libusb-android
• Porting Libusb for Android on the Beagleboard in 5 steps
• can’t mount usbfs in Android 2.2
• libusb和HID设备

windows: hosts文件在C:\WINDOWS\system32\drivers\etc目录下 hosts文件
Linux: sudo vi /etc/hosts

下面包含Google+和Youtube

203.208.46.29 plus.Google.com
203.208.46.29 talkgadget.google.com

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203.208.46.29 v24.lscache5.c.youtube.com
203.208.46.29 v1.lscache6.c.youtube.com
203.208.46.29 v2.lscache6.c.youtube.com
203.208.46.29 v3.lscache6.c.youtube.com
203.208.46.29 v4.lscache6.c.youtube.com
203.208.46.29 v5.lscache6.c.youtube.com
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203.208.46.29 v7.lscache6.c.youtube.com
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203.208.46.29 v15.lscache6.c.youtube.com
203.208.46.29 v16.lscache6.c.youtube.com
203.208.46.29 v17.lscache6.c.youtube.com
203.208.46.29 v18.lscache6.c.youtube.com
203.208.46.29 v19.lscache6.c.youtube.com
203.208.46.29 v20.lscache6.c.youtube.com
203.208.46.29 v21.lscache6.c.youtube.com
203.208.46.29 v22.lscache6.c.youtube.com
203.208.46.29 v23.lscache6.c.youtube.com
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203.208.46.29 v1.lscache7.c.youtube.com
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203.208.46.29 v21.lscache8.c.youtube.com
203.208.46.29 v22.lscache8.c.youtube.com
203.208.46.29 v23.lscache8.c.youtube.com
203.208.46.29 v24.lscache8.c.youtube.com

参考:
1. 修改hosts看youtube

gitk图形界面对于中文不友好，中文显示字体怪怪的， 由于gitk是用Tcl/Tk写的工具，默认使用Tk 8.4，不支持抗锯齿，因此字体显示很难看。在Tk 8.5支持了部分抗锯齿字体，修改gitk使用Tk 8.5后显示效果会好一点。

解决方案， 安装Tk8.5，并选为默认：

sudo apt-get install tk8.5
sudo update-alternatives –config wish

选择 “–> select /usr/bin/wish8.5″.

这样gitk的字体就会好看很多，一般习惯吧字体设置为”DejaVu Sans Mono”. 修改 ~/.gitk文件替换原来的字体:

set mainfont    {{DejaVu Sans Mono} 9}
set textfont    {{DejaVu Sans Mono} 9}
set uifont      {{DejaVu Sans Mono} 9 bold}

如果想使用”文泉驿”字体也可以在~/.gitk里面配置，前提是你需要安装相关的字体。

sudo apt-get install ttf-wqy-microhei ttf-wqy-zenhei xfonts-wqy
vim ~/.gitk
set mainfont {文泉驿等宽正黑 9}
set textfont {文泉驿等宽正黑 9}
set uifont {文泉驿等宽正黑 9 bold}

– EOF –

错误信息:

bvcom@ubuntu:~/tmp/AR6kSDK.2.2.1.180$ git push
Counting objects: 29, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (12/12), done.
Writing objects: 100% (15/15), 1.53 KiB, done.
Total 15 (delta 7), reused 0 (delta 0)
remote: error: refusing to update checked out branch: refs/heads/master
remote: error: By default, updating the current branch in a non-bare repository
remote: error: is denied, because it will make the index and work tree inconsistent
remote: error: with what you pushed, and will require ‘git reset –hard’ to match
remote: error: the work tree to HEAD.
remote: error:
remote: error: You can set ‘receive.denyCurrentBranch’ configuration variable to
remote: error: ‘ignore’ or ‘warn’ in the remote repository to allow pushing into
remote: error: its current branch; however, this is not recommended unless you
remote: error: arranged to update its work tree to match what you pushed in some
remote: error: other way.
remote: error:
remote: error: To squelch this message and still keep the default behaviour, set
remote: error: ‘receive.denyCurrentBranch’ configuration variable to ‘refuse’.
To git://192.168.2.212/AR6kSDK.2.2.1.180/.git
! [remote rejected] master -> master (branch is currently checked out)
error: failed to push some refs to ‘git://192.168.2.212/AR6kSDK.2.2.1.180/.git’

解决方法:
这是由于git默认拒绝了push操作，需要进行设置，修改.git/config添加如下代码：

[receive]
denyCurrentBranch = ignore

在初始化远程仓库时最好使用 git –bare init 而不要使用：git init
如果使用了git init初始化，则远程仓库的目录下，也包含work tree，当本地仓库向远程仓库push时, 如果远程仓库正在push的分支上（如果当时不在push的分支，就没有问题）, 那么push后的结果不会反应在work tree上, 也即在远程仓库的目录下对应的文件还是之前的内容，必须得使用git reset –hard才能看到push后的内容.

1. http://hi.baidu.com/wbo4958/blog/item/8613d68619b0522666096eff.html
2. http://hi.baidu.com/zkfarmer/blog/item/4a4bfd0899db95336a60fb42.html

–EOF–

linux kernel的启动logo存放于KERNEL_PATH/drivers/video/logo/logo_linux_cult224.ppm

是被编译到内核的，所以不能简单的替换就改变原有的logo，按以下命令制作logo_linux_cult224.ppm:

pngtopnm logo.png > logo_linux_cult224.pnm　　　　　　　/*格式转换*/
pnmquant 224 logo_linux_cult224.pnm > logo_linux_cult224.pnm　/*将图像改为224色*/
pnmtopnm logo_linux_cult224.pnm > logo_linux_cult224.ppm　/*将图像转存为ppm格式*/

替换新内核中原有的logo_linux_cult224.ppm，注意备份原有的企鹅logo_linux_cult224.ppm。

内核编译后，且以framebuffer方式启动新内核，此时企鹅图标就变成了自定义的LOGO（注意LOGO图像的尺寸不能大于framebuffer的尺寸）

但是在启动中，logo上会有光标在闪烁，如果需要将光标去除（提示console的光标也会消失），将内核中的KERNEL_PATH/drivers/video/console/fbcon.c中的fb_flashcursor和fbcon_sursor函数体置空。重新编译安装内核即可。

参考: http://www.cnblogs.com/semo/archive/2011/01/05/1926295.html

–EOF–