CME34M Hardware Manual - RTD Embedded Technologies, Inc.
CME34M Hardware Manual - RTD Embedded Technologies, Inc.
CME34M Hardware Manual - RTD Embedded Technologies, Inc.
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Features and Settings That Can Affect Boot Time<br />
The boot time of a system is dependent upon numerous system settings as well as devices attached to a system.<br />
This section addresses some devices and settings that can increase or decrease a system’s boot time.<br />
Quick Boot<br />
The BIOS contains a Quick Boot option that minimizes the boot time of the system. Quick Boot eliminates the<br />
exhaustive tests that are performed during Power On Self Test (POST) while maintaining the functionality of the<br />
board. By enabling the Quick Boot feature, your system can achieve 5-second boot times.<br />
Add-On Cards With BIOS Extensions<br />
Some add-on cards have an integrated BIOS extension. The most common examples are SCSI controllers and<br />
network cards with boot ROMs. During POST, the BIOS executes the card's extension code. This extension code<br />
is third-party code, which is beyond <strong>RTD</strong>'s control. The BIOS extension will most likely increase the boot time.<br />
Exactly how much it increases boot time will depend on the particular card and firmware version.<br />
VGA Controller<br />
VGA controllers have a VGA BIOS that must be initialized during POST. It can take some time to initialize the<br />
VGA BIOS. Exactly how long will depend on the particular VGA controller and BIOS version.<br />
Hard Drive Type<br />
During Hard Drive initialization, each device must be probed. Some devices take longer to probe. 2.5-inch hard<br />
drives tend to take longer than 3.5-inch ones, because they spin at a lower RPM.<br />
Monitor Type<br />
Some monitors take a while to power on. Desktop flat panels are especially slow. This does not affect the actual<br />
boot time of the CPU. However, the CPU may boot before the monitor powers on.<br />
NVRAM Updates<br />
System configuration data is stored in the onboard NVRAM. When the system configuration changes, this<br />
information must be updated. If an update is necessary, it will happen at the end of POST (the BIOS will display<br />
an “Updating NVRAM…” message). The NVRAM update takes a few seconds and increases the boot time. Once<br />
the NVRAM is updated, boot times will return to normal.<br />
NVRAM updates only happen when the system configuration changes. They do not happen spuriously. They are<br />
usually triggered by adding or removing a PCI device from a stack. Updates can also be triggered by altering the<br />
Plug-n-Play configuration of the BIOS.<br />
Boot Device Order<br />
The BIOS contains a list of devices to try booting from. If you wish to boot to a particular device (for example, a<br />
hard drive), make sure that it is first in the boot order. This will speed up boot times.<br />
BDM-610000076 Rev A Chapter 4: Using the cpuModule 73
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