TYAN TN71-BP012, Service Manual

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Chapter 5: Petitboot Bootloader
5.1 About the Petitboot
The Petitboot is a platform independent bootloader based on the Linux kexec warm
reboot mechanism. Petitboot supports loading kernel, initrd and device tree files
from Linux mountable file system, plus can load files from the network using various
protocols. Petitboot includes command line user interface programs and can boot
operating system that includes kexec boot support.
The Petitboot section of this manual is subject to change without notice and is
provided for reference purposes only. The settings and configurations of the
Petitboot are current at the time of print and are subject to change, and therefore
may not match exactly what is displayed on screen.
This section describes the Petitboot menu program. The menu program lets you
modify basic configuration settings. The settings are then stored in a NVRAM
partition that retains the information even when the power is turned off.
To start the Petitboot menu program:
1. Power on or reboot your system.
2. After the Processor NOR (PNOR) firmware process is complete, the Petitboot
menu will automatically show up on the system console output or on the VGA
screen.
Note: Once the Petitboot menu program starts, it will scan local boot devices and
network interfaces to find boot options that are available to the system. If the boot
options exist, after approximately 10 seconds, Petitboot will boot the first option.
5.1.1 Setup Basics
The table below shows how to navigate in the Petitboot menu program using the
keyboard.
Key Function
Left/Right Arrow Keys Move between characters
Up/Down Arrow Keys Move between selections
Enter Open highlighted section or accept the configuration
Tab Move to the next selection
Tab + Shift Keys Move to the previous selection
ESC/X Keys Exit