Octagon 5266, Справочное руководство

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System generates a BIOS message but locks up when booting
Turn the “S” switch Off and reboot.
Verify that all the necessary boot files exist on the boot device. Copy any
missing files to the boot device.
If no files are missing, overwrite any files which may have become corrupted.
In addition, you may want to format the boot device.
System will not boot from CompactFlash
Many CompactFlash devices as shipped from the factory are not bootable devices.
Refer to the CompactFlash, SDRAM, and battery backup chapter to make your
CompactFlash bootable. Also, try changing the IDE 0 parameters in Setup to
Phoenix or Physical, and ensure that the CompactFlash is designated as drive C:.
System locks up on power-up; may or may not respond to reset switch
A common cause is using a non-Octagon power supply such as a PC desktop supply.
Most of these PC supplies are rated at 5V at 20A or more. Switching supplies
usually requires a 20% load to operate properly, that is, 4A or more. Since a typical
Octagon system takes less than 2A, the supply does not regulate properly. Output
drift up to 6–7V and/or 7–8 voltage spikes have been reported. If the power supply
comes up slowly, the sequencing of ICs on the board may be out of sync, thus,
causing the system to lock up.
System locks up after power-down/power-up
If the power supply does not drain below 0.7V, the CMOS components on the card
will act like diodes and forward bias. This is typically caused by using power
supplies that have large output capacitors. Either use a different power supply that
discharges faster, leave the power off until the supply has adequate time to
discharge or place a 100 ohm, large wattage resistor across the output capacitor.
LED signaling of “beep” counts
Description
The 5266 performs a complete series of tests during power on self test (POST). The
progress is recorded in port 80. Table 18–1 shows the port 80 codes.
The 5266 has a bicolor LED that is used by the BIOS to indicate the BIOS
processing state. Immediately after the 5266 powers on, the LED is on and the
green LED is off. Once the card boots, the amber LED turns off and the green LED
is on.
If the BIOS finds an error during POST the amber LED is flashed in a count
indicating the POST code failure. The visual beep counts are defined in Table 18–2.
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