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Fastboot

1,420 bytes added, 08:51, 4 March 2014
Software
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.
__TOC__  <br>  <span style="color: rgb(255, 0, 0);">'''THIS DOCUMENT IS WORK IN PROGRESS'''</span>
= Development Enviroment =
*Toolchain Ubuntu - linaro (<span style="line-height: 1.5em;">arm-linux-gnueabihf-gcc (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3) Included in Ubuntu 12.04 LTS</span>
*IGEP-X-Loader release 3
*Minimal Rootfs generation scripts<span id="1393404345939S" style="display: none;"></span><br> *Linux kernel 2.6.37.y - fastboot
<br>
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
 
<u>'''Boot Time'''</u>
IGEP-X-Loader standard takes 4.11 sec.
Load other drivers and execute the system scripts takes 29.1 sec (including start the X and sato environment)
<div style="text-align: center;">
{{#ev:youtube|-rMN2OJyR-k|500}}</div>== IGEPv2 Fast Boot DEMO == Software Used: IGEP-X-Loader version 3.0  Linux Kernel: 2.6.37.y fastboot  <u>'''Boot time'''</u>&nbsp;  IGEP-X-Loader load time: 0.7 sec  Kernel Boot: 0.9 sec
== IGEPv2 Fast Boot DEMO ==UbiFs Mount time: 1 sec
Execute System Scripts: 0.3 sec
<div style="text-align: center;">
{{#ev:youtube|Yjz4WXfHHHk|500}}
</div>
 
== 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 [https://www.isee.biz/support/downloads/item/igepv2-rc-fastboot-demo here]
 
== Install Procedure ==
 
#Download the software.
#Create a new microsd card default firmware image.
#Replace zImage with the zImage included in the package.
#Boot your board and erase the partirions mtd1 and mtd2.
#Using nandwrite write the Image kernel into mtd1.
#Install the ubi image provided into the mtd2 partition.
#Replace mtd0 MLO using the ISEE writeloader tool.
#Reboot.
 
== More information ==
 
If you wish more information or support for implement fastboot solution in your product [https://www.isee.biz/contact-us contact us]