HP 520 5/XX, 525 5/XX manual Test Description System Bios Tests, Abort, To abort, Process to abort

4 Summary of the HP/Phoenix BIOS

HP/Phoenix BIOS (BIOS version: GX.07.xx)

To see the tests performed during the POST, press when the initial HP “Vectra” logo appears, and the display will switch to text mode. In this mode, a summary configuration screen will be displayed at the end of the POST.

Devices, such as memory and hard disks, are configured automatically. The user is not requested to confirm the change. However, the user is prompted if a device is found to have gone missing since the previous boot. The user can simply accept the new configuration by pressing .

During the POST, the BIOS and other ROM data are copied into high-speed shadow RAM. The shadow RAM is addressed at the same physical location as the original ROM in a manner which is completely transparent to applications. It therefore appears to behave as very fast ROM. This technique provides faster access to the system BIOS firmware.

The table on the following page lists the POST routines in the order in which they are executed (from the shadow RAM). If the POST is initiated by a soft

reset and , the RAM tests are not executed and shadow RAM is not cleared. In all other respects, the POST executes in the same way following power-on or a soft reset.

Test

Description

	System BIOS Tests
LED Test	Tests the LEDs on the control panel.
Processor Test	Tests the processor’s registers. Test failure causes the boot process to
	abort.
System (BIOS) ROM Test	Calculates an 8-bit checksum. Test failure causes the boot process to
	abort.
RAM Refresh Timer Test	Tests the RAM refresh timer circuitry. Test failure causes the boot process
	to abort.
	Checks the first 64 KB of system RAM used to store data corresponding to
Interrupt RAM Test	various system interrupt vector addresses. Test failures cause the boot
	process to abort.
	Tests the system ROM BIOS and shadows it. Failure to shadow the ROM
Shadow the System ROM	BIOS will cause an error code to display. The boot process will continue,
BIOS	but the system will execute from ROM. This test is not performed after a
	soft reset (using	and	).
Load CMOS Memory	Checks the serial EEPROM and returns an error code if it has been
	corrupted. Copies the contents of the EEPROM into CMOS RAM.
CMOS RAM Test	Checks the CMOS RAM for start-up power loss, verifies the CMOS RAM
	checksum(s). Test failure causes error codes to display.

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