Difference between revisions of "Fastboot"
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This article describes the fast boot implementation done by ISEE in IGEP boards. Fast boot must be application oriented and several key point must be tuned for archive the minimum boot time. | This article describes the fast boot implementation done by ISEE in IGEP boards. Fast boot must be application oriented and several key point must be tuned for archive the minimum boot time. | ||
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= Development Enviroment = | = Development Enviroment = | ||
Revision as of 11:46, 26 February 2014
Overview
This article describes the fast boot implementation done by ISEE in IGEP boards. Fast boot must be application oriented and several key point must be tuned for archive the minimum boot time.
Contents
Development Enviroment
- Ubuntu 12.04 LTS
- Toolchain Ubuntu - linaro (arm-linux-gnueabihf-gcc (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3) Included in Ubuntu 12.04 LTS
- IGEP-X-Loader release 3
- Minimal Rootfs generation scripts
- Linux kernel 2.6.37.y - fastboot
What we want archive?
This demostration want archive a maximum 3 sec boot time from power up to linux system ready.
The system must include the video system, ethernet, rootfs using ubi in whole NAND partition, i2c, uarts, gpio, power management, system console.
The maximum CPU clock speed must be 800 Mhz.
IGEPv2 Default system DEMO
IGEPv2 include a default linux system demo based on yocto, we will analyze the boot process.
Software Used:
Default IGEP-X-loader 2.5
Default IGEP firmware yocto based 1.2
Boot Time
IGEP-X-Loader standard takes 4.11 sec.
Linux Kernel boot time up to mount the rootfs takes 3.8 sec.
Mount the rootfs takes 14.7 sec.
Load other drivers and execute the system scripts takes 29.1 sec (including start the X and sato environment)
IGEPv2 Fast Boot DEMO
Software Used: IGEP-X-Loader version 3.0
Linux Kernel: 2.6.37.y fastboot
Boot time
IGEP-X-Loader load time: 0.7 sec
Kernel Boot: 0.9 sec
UbiFs Mount time: 1 sec
Execute System Scripts: 0.3 sec
Improve the fast boot setup
It's possible improve the results doing some modifications:
- Disable the IGEP-X-Loader serial prints (-0.1 sec)
- The kernel is flashed uncompressed over a 6 MiB partition and IGEP-X-Loader load whole partition, we can get it small due the kernel with this setup takes 3.7 MiB (-0.25 sec)
- Disable some drivers at boot and load it after initial boot such (Video -0.35 sec, ethernet -0.02 sec)
- Create a Small footprint rootfs ubi partition or use other format faster (variable: -0.2 to -0.6 sec)
Software
You can test the fast boot setup the software package it's located here
