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<hr><p align="left"><small>发信人: plato (纯真年代), 信区: Embedded <br>
标 题: linux for ppc chapter 7 <br>
发信站: BBS 水木清华站 (Wed May 30 23:13:13 2001) <br>
<br>
Next Previous Contents <br>
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7. Boot Sequence <br>
The Linux boot sequence is more complicated than your average embedded opera <br>
ting system, and there are many more options for configuring things. In gene <br>
ral, the boot sequence goes like this: <br>
Processor comes out of reset and branches to the ROM startup code. <br>
The ROM startup code initialises the CPU and memory controller, performing o <br>
nly minimal initialisation of on-chip devices, such as the console serial po <br>
rt (typically SMC1 on 8xx devices) to provide boot diagnostic messages. It a <br>
lso sets up the memory map for the kernel to use in a format that is consist <br>
ent across platforms, and then jumps to the boot loader. <br>
The boot loader decompresses the kernel into RAM, and jumps to it. <br>
The kernel sets up the caches, initialises each of the hardware devices via <br>
the init function in each driver, mounts the root filesystem and execs the i <br>
nit process, which is the ultimate parent of all user mode processes, typica <br>
lly /sbin/init. <br>
Executing the first program linked against the shared C runtime library (oft <br>
en init) causes the shared runtime library to be loaded. <br>
In a typical Linux system, init reads /etc/inittab to execute the appropriat <br>
e run control script from /etc/rc.d, which execute the start scripts to init <br>
ialise networking and other system services. <br>
In minimal embedded systems, init is commonly replaced with a simple C progr <br>
am or shell script to start the appropriate services and/or application prog <br>
rams, since the conventional rc scripts are often overkill. <br>
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Next Previous Contents <br>
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-- <br>
<br>
※ 来源:·BBS 水木清华站 smth.org·[FROM: 166.111.161.8] <br>
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