Fast linux boot (5 S boot time)

Author: drivermonkey

Contact way: 196568501 (qq), bookworepeng.hotmail.com

Test environment:

Processor: Ti am335x

Test Board: Ti am3359beaglebone

Boot Mode: uboot SD card boot

Drop module: All Network Module

All file systems except ext3

All cryptographic API
All Library Routines

All kernel hacking

Kernel print information:

Uncompressing Linux... done, booting the kernel.
[0.000000] Linux version 3.2.0 (root @ ubuntu) (gcc version 4.5.3 20110311 (p2
[2, 0.000000] CPU: ARMv7 Processor [413fc082] revision 2 (ARMv7), cr = 10c53c7d

......

[4.338134] Freeing init memory: 192 K (there are 2-3 S differences in the test time)

......

Test Results

Kernel Start Time: 1.9 S

Kernel decompress copy time: 2.xS

Bootloader time: 1 S

The start time is 5 S.

Summary:

The entire system is divided into three parts:

1. network initialization

2. file system initialization

3. script execution time

You only need to know the time code to crop the corresponding code points.

Comparison of time before and after cutting --

Before cutting: 70.s

After reduction: 5.3 s

Note: includes the time when bootloader is started to the system.