Handbook:AMD64/Blocks/Booting/zh-cn

Booting the installation media
Once the installation CD is burned, it is time to boot it. Remove all external bootable media from the system (including any CD/DVD disks or USB drives), reboot the system, and enter the motherboard's firmware user interface. This is usually performed by pressing a keyboard key such as, , , or during the Power-On Self-test (POST) process. The 'trigger' key varies depending on the system and motherboard. If it is not obvious use an internet search engine and do some research using the motherboard's model name as the search keyword. Results should be easy to determine. Once inside the motherboard's firmware menu, change the boot order so that the external bootable media (CD/DVD disks or USB drives) are tried before the internal disk devices. Without this change, the system will most likely reboot to the internal disk device, ignoring the external boot media.

现在将安装 CD 光盘放进 CD-ROM 光盘驱动器并重启. 这时，将会出现一个启动提示符，按 回车按键将会用默认的启动选项开始启动过程. 要想用不同的启动选项来启动安装 CD 光盘，需要指定一个内核及想要的启动选项，再按 回车按键.

在启动提示符下，用户可以按 按键显示可用的内核，按  按键显示可用的启动选项. 如果在15秒内没做任何选择（既不显示信息，也不选择内核）安装 CD 光盘将会用硬盘启动. 这样不用将 CD 光盘从光盘驱动器里拿出来，也可以在安装过程中重启并尝试已安装好的环境（这有时在远程安装的时候很有用）.

我们提到过要指定内核. 在安装 CD 光盘上提供了几个内核. 默认使用的是gentoo. 其他内核是为了特殊硬件的需要，-nofb内核关闭了帧缓冲（framebuffer）的支持.

下表给出了可用内核的一个简单说明.

Kernel choices
引导选项可以配合内核进一步调整引导过程的行为.

Logical volume/device management

 * dolvm
 * This enables support for Linux's Logical Volume Management.

Other options

 * debug
 * Enables debugging code. This might get messy, as it displays a lot of data to the screen.


 * docache
 * This caches the entire runtime portion of the CD into RAM, which allows the user to umount and mount another CDROM. This option requires that there is at least twice as much available RAM as the size of the CD.


 * doload=X
 * This causes the initial ramdisk to load any module listed, as well as dependencies. Replace X with the module name. Multiple modules can be specified by a comma-separated list.


 * dosshd
 * Starts sshd on boot, which is useful for unattended installs.


 * passwd=foo
 * Sets whatever follows the equals as the root password, which is required for dosshd since the root password is by default scrambled.


 * noload=X
 * This causes the initial ramdisk to skip the loading of a specific module that may be causing a problem. Syntax matches that of doload.


 * nonfs
 * Disables the starting of portmap/nfsmount on boot.


 * nox
 * This causes an X-enabled LiveCD to not automatically start X, but rather, to drop to the command line instead.


 * scandelay
 * This causes the CD to pause for 10 seconds during certain portions the boot process to allow for devices that are slow to initialize to be ready for use.


 * scandelay=X
 * This allows the user to specify a given delay, in seconds, to be added to certain portions of the boot process to allow for devices that are slow to initialize to be ready for use. Replace X with the number of seconds to pause.

现在来引导CD，选择一个内核（如果默认的 的内核不能满足）和引导选项. 作为示例，我们引导 内核，并带有 作为内核参数：

接下来迎接用户的是一个引导屏幕和进度条. 如果用来安装系统的是一个非US键盘，确保马上按 + 来切换到详细模式并遵照提示. 如果在10秒钟内什么都没有选，则接受默认（US键盘）并继续引导过程. 一旦引导过程完成，用户将自动以root超级用户身份登录到“Live”Gentoo Linux环境. 当前控制台将显示一个root提示符，并且可以通过按 + 、 + 和 + 切换到其他控制台. 按 + 返回到启动时的那个.