HP Net Vectra Technical Reference Manual page 63

Shadow the System ROM BIOS
Load CMOS Memory
CMOS RAM Test
CPU Cache Memory Test
Initialize the Graphics Controller
8042 Self-Test
Timer 0/Timer 2 Test
DMA Subsystem Test
Interrupt Controller Test
Real-Time Clock Test
RAM Address Line
Independence Test
Size Extended Memory
Real-Mode Memory Test (First
640KB)
Shadow RAM Test
Tests the system ROM BIOS and shadows it. Failure to shadow the ROM
BIOS will cause an error code to display. The boot process will continue, but
the system will execute from ROM. This test is not performed after a soft
reset (using
Checks the serial EEPROM and returns an error code if it has been
corrupted. Copies the contents of the EEPROM into CMOS RAM.
Checks the CMOS RAM for start-up power loss, verifies the CMOS RAM
checksums. Test failure causes error codes to display.
Tests the processor's internal level-one cache RAM. Test failure causes an
error code to display and the boot process to abort.
Video Tests
Initializes the graphics subsystem, tests the video shadow RAM, and
shadows the video BIOS. A failure causes an error code to display, but the
boot process continues.
System Board Tests
Downloads the 8042 and invokes the 8042 internal self-test. A failure
causes an error code to display.
Tests Timer 0 and Timer 2. Test failure causes an error code to display.
Checks the DMA controller registers. Test failure causes an error code to
display.
Tests the Interrupt masks, the master controller interrupt path (by forcing
an IRQ0), and the industry-standard slave controller (by forcing an IRQ8).
Test failure causes an error code to display.
Checks the real-time clock registers and performs a test that ensures that
the clock is running. Test failure causes an error code to display.
Memory Tests
Verifies the address independence of real-mode RAM (no address lines stuck
together). Test failure causes an error code to display.
Sizes and clears the protected mode (extended) memory and writes the
value into CMOS bytes 30h and 31h. If the system fails to switch to
protected mode, an error code is displayed.
Read/write test on real-mode RAM. (This test is not done during a reset
using and
system RAM to determine how much is present. Test failure of a 64 KB
block of memory causes an error code to display, and the test is aborted.
Tests shadow RAM in 64 KB segments (except for segments beginning at
A000h, B000h, and F000h). If they are not being used, segments C000h,
D000h and E000h are tested. Test failure causes an error code to display.
5 Power-On Self-Test and Error Messages
Order in Which the Tests are Performed
and ).
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). The test checks each block of
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