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6.2.2 Reducing Boot Time
In later versions of the BIOS options will exist within the Setup program to greatly
reduce the amount of time the BIOS spends testing the hardware prior to booting the
operating system. This will result in a reduction in time between resetting the TP400
and running your application. At the same time, messages printed on the screen by
the BIOS can be reduced.
The current version of the BIOS there is one option that affects the boot time. By
default a summary screen is displayed prior to booting an operating system. This
summary screen can be disabled by the BIOS Setup program, using the Main / Boot
Options menu.
6.3
VGA BIOS AND OTHER BIOS EXTENSIONS
As well as the system BIOS, the Flash memory chip can (and usually does) contain
other BIOS extensions. These include the VGA BIOS and the Flash File System
BIOS.
6.3.1 Principles of Operation
The system BIOS and the BIOS extensions are combined into a single 256k byte file,
which is programmed into the Flash memory chip using a Flash programming utility,
as described in section 6.5. A number of these pre-configured BIOS image files are
present on the TP400 Utilities Disk. The pre-configured files include options with and
without the Flash File System driver.
As well as executing BIOS extensions contained within the Flash chip, the BIOS also
searches the PC/104 and PC/104-Plus buses for BIOS extension EPROMs that
might be present elsewhere in the system. The BIOS searches on every 2k byte
boundary from C0000h to just below the system BIOS at E0000h. If valid BIOS
extension EPROMs are found on the PC/104 or PC/104-Plus buses then they are
executed.
The system BIOS is shadowed, and BIOS extension code in the Flash chip, such as
the VGA BIOS and the Flash File System BIOS Extension, is also shadowed. BIOS
extensions that may reside on other PC/104 modules (such as VGA boards or LAN
boards) may also be shadowed. This shadowing is enabled or disabled by the TP400
Setup program, in the Main/Memory Shadow menu.
6.3.2 The VGA BIOS Extension
The standard TP400 boards are shipped with a BIOS image that includes two BIOS
extensions. One is for the VGA controller present on the TP400. The VGA BIOS
extension is 32k bytes in size, and is located at address C0000h.
By default the VGA BIOS drives a CRT only. However, the BIOS Setup program
allows TFT flat panels to operate as well. The flat panels can be switched on using
the Advanced / Geode GX1 LCD menu item.
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