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Chapter 4: Using the cpuModule
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Features and Settings That Can Affect Boot Time
The boot time of a system is dependent upon numerous system settings as well as devices attached to a system.
This section addresses some devices and settings that can increase or decrease a system’s boot time.
Boot Device Order
The BIOS contains a list of devices to try booting from. If you wish to boot to a particular device (for example, a
hard drive), make sure that it is first in the boot order. This will speed up boot times.
Add-On Cards With BIOS Extensions
Some add-on cards have an integrated BIOS extension. The most common examples are SCSI controllers and
network cards with boot ROMs. During POST, the BIOS executes the card's extension code. This extension code
is third-party code, which is beyond RTD's control. The BIOS extension will most likely increase the boot time.
Exactly how much it increases boot time will depend on the particular card and firmware version.
VGA Controller
VGA controllers have a VGA BIOS that must be initialized during POST. It can take some time to initialize the
VGA BIOS. Exactly how long will depend on the particular VGA controller and BIOS version.
Hard Drive Type
During Hard Drive initialization, each device must be probed. Some devices take longer to probe. 2.5-inch hard
drives tend to take longer than 3.5-inch ones, because they spin at a lower RPM.
Monitor Type
Some monitors take a while to power on. Desktop flat panels are especially slow. This does not affect the actual
boot time of the CPU. However, the CPU may boot before the monitor powers on.
Network (PXE) Boot
The Ethernet controllers on the CMA34CR support Preboot Execution Environment (PXE) which permits the
cpuModule to boot using a network interface. The PXE Boot ROM, which allows booting over the network, may
be disabled in the BIOS to speed up boot time.
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