Codici errore del BIOS

Alcune schede madri permettono l’individuazione degli errori hardware tramite un display a 2 caratteri, questi codici possono semplificare l’individuazione e la risoluzione dei problemi.

Tabella ACER

04	CPU verification; POST start
08	Shutdown condition 0; Shutdown byte 0
0C	BIOS ROM checksum tested
10	CMOS ROM shutdown byte tested
14	DMA controller tested
18	System timer initialized
1C	Memory refresh system tested
1E	Memory type determined
20	Base 128K memory tested
24	8042 keyboard controller tested
28	CPU descriptor instruction tested
2C	8259 PIT tested
30	Temporary Interrupts located and initialized
34	BIOS Interrupt vectors and routines configured
38	CMOS RAM tested
3C	Memory size determined
40	Shutdown condition 1
44	Video BIOS ROM initialized
45	RAM initialized and tested
46	Cache memory and controller initialized and tested
48	Memory tested
4C	Shutdown condition 3
50	Shutdown condition 2
54	Shutdown condition 7
58	Shutdown condition 6
5C	Keyboard and auxiliary I/O tested
60	BIOS Interrupt routines setup
64	RTC tested
68	Floppy drive and controller tested
6C	Hard drive and controller tested
70	Parallel port tested
74	Serial port tested
78	Time of day setup
7C	Optional ROM’s searched for and started
80	Math coprocessor tested
84	Keyboard tested
88	System initialized
8C	System initialized
90	Operating system boot process started
94	Shutdown condition 5
98	Shutdown condition A
9C	Shutdown condition B

Tabella ASUS

POST code	What It Means
8	CPU not detected
4B/FA	No DRAM detected/installed
F9/0D	DRAM training failed
90/CF	DRAM recovery
06	DRAM unstable
A0-A2	Boot up device unstable
B2	External device unstable
D6	Graphics card unstable
AA	Boot into the system

Tabella Asrock

POST Code	What It Means
FF, 00 – 19/D0-D3	Reseat Memory and then clear CMOS
31-3B/51-55	Problem related to CPU and memory
D4-D5	PCI resource allocation error
D6, 92-97	Graphics card not recognized
D7	Keyboard not recognized
9A-9D	Problem related to USB devices
03	System entering sleep
AA	System is entering OS

Tabella Compaq

00	Initialize flags, MSW,IDTLIN
01	Read manufacturing jumper
02	8042 received read command
03	No response from 8042
04	Look for ROM at E000
05	Look for ROM at C800
06	Normal CMOS reset code
08	Initialize 8259,80287
09	Reset code in CMOS byte
0A	Vector vis 40:67 reset function
0B	Vector vis 40:67 with E01 function
0C	Boot reset function
0D	Test #2 8254 PIT counter 0
0E	Test #2 8254 PIT counter 2
0F	Warm boot
10	PPI disabled, test 8254 PIT’s 0 and 1
11	Initialize (blast) VDU controller
12	Clear screen; turn ON video
13	Test time 0
14	Disable RTC interrupts
15	Check battery power
16	Battery has lost power
17	Clear CMOS Diags.
18	Test base memory (First 128K)
19	Initialize base memory
1A	Initialize VDU adapters
1B	The system ROM
1C	CMOS checksum
1D	DMA controller/page registers
1E	Test keyboard controller
1F	Test 286 protected mode
20	Test real and extended memory
21	Initialize time-of-day
22	Initialize 287 coprocessor
23	Test the keyboard and 8042
24	Reset A20, set default CPU speed
25	Test diskette subsystem
26	Test fixed disk subsystem
27	Initialize parallel printer
28	Perform search for optional ROM’s
29	Test valid system configuration
2A	Clear screen
2B	Check for invalid time and date
2C	Optional ROM search
2D	Test timer 2
2F	Write to diagnostic byte
30	Clear first 128K bytes of RAM
31	Load interrupt vectors 70-77
32	Load interrupt vectors 00-1F
33	Initialize MEMSIZE and RESETWD
34	Verify CMOS checksum
35	CMOS checksum is not valid
36	Check battery power
37	Check for game adapters
38	Check for Serial ports
39	Check for parallel printer ports
3A	Initialize port and comm time-outs
3B	Flush keyboard buffer
40	Save RESETWD value
41	Check RAM refresh
42	Start write of 128K RAM test
43	Reset parity checks
44	Start verify of 128K RAM test
45	Check for parity errors
46	NO RAM errors
47	RAM error detected
50	Check for dual frequency in CMOS
51	Check CMOS VDU configuration
52	Start VDU ROM search
53	Vector to VDU option ROM’s
54	Initialize first display adapter
55	Initialize second display adapter
56	No display adapters installed
57	Initialize primary VDU mode
58	Start of VDU test (each adapter)
59	Check existence of adapter
5A	Check VDU registers
5B	Start screen memory test
5C	End test of adapter, clear memory
5D	Error detected on an adapter
5E	Test the next adapter
5F	All adapters successfully tested
60	Start of memory tests
61	Enter protected mode
62	Start memory sizing
63	Get CMOS size
64	Start test of real memory
65	Start test of extended memory
66	Save size memory (base, ext)
67	128K-option installed CMOS bit
68	Prepare to return to real mode
69	Back in real mode-successful
6A	Protected mode error during test
6B	Display error message
6C	End of memory test
6D	Initialize KB OK string
6E	Determine size to test
6F	Start MEMTEST
70	Display XXXXXKB OK
71	Test each RAM segment
72	High order address test
73	Exit MEMTEST
74	Parity error on bus
75	Start protected mode test
76	Prepare to enter protected mode
77	Test software exceptions
78	Prepare to return to real mode
79	Back in real mode-successful
7A	Back in real mode-error occurred
7B	Exit protected mode
7C	High order address test failure
7D	Entered cache controller test
7E	Programming memory cache
7F	Copy system ROM to high RAM
80	Start of 8042 test
81	Do 8042 self test
82	Check result received
83	Error result
84	OK 8042, Init mode=5D
86	Start test, reset keyboard
87	Got acknowledge, read result
88	Got result, check it
89	Test for stuck keys
8B	Test keyboard interface
8A	Key seems to be stuck
8C	Got result, check it
8D	End of test, no errors
90	Start of CMOS test
91	CMOS seems to be OK
92	Error on CMOS read,write test
93	Start of DMA controller test
94	Page registers seem to be OK
95	DMA controller is OK
96	8237 initialization is complete
97	Start of NCA RAM test
A0	Start of diskette tests
A1	FDC reset active (3F2h Bit 2)
A2	FDC reset inactive (3F2h Bit 2)
A3	FDC motor on
A4	FDC time-out error
A5	FDC failed reset
A6	FDC passed reset
A8	Start to determine drive type
A9	Seek operation initialized
AA	Waiting for FDC seek status
AF	Diskette tests complete
B0	Start of fixed drive tests
B1	Combo board not found-exit
B2	Combo controller failed-exit
B3	Testing drive 1
B4	Testing drive 2
B5	Drive error (error condition)
B6	Drive failed (failed to respond)
B7	No fixed drives-exit
B8	Fixed drive tests complete
B9	Attempt to boot diskette
BA	Attempt to boot fixed drive
BB	Boot attempt failed FD/HD
BC	Jump to boot record
BD	Drive error, retry booting
BE	Weitek coprocessor test
D0	Entry to clear memory routine
D1	Ready to go to protected mode
D2	Ready to clear extended memory
D3	Ready to reset back to real mode
D4	Back in real mode
D5	Clear base memory
DD	Built-in self-test failed
E0	Ready to replace E000 ROM
E1	Completed E000 ROM replacement
E2	Ready to replace EGA ROM
E3	Completes EGA ROM replacement

Tabella Dell

01	CPU register test in progress
02	CMOS read/write test failed
03	BIOS ROM checksum bad
04	8254 programmable interrupt controller failed
05	DMA controller initialization failed
06	DMA page-register test failed
08	RAM refresh verification failed
09	Starting first-64K RAM test
0A	First-64KB RAM IC or data line bad
0B	First-64KB RAM odd/even logic bad
0C	First-64KB address line bad
0D	First-64KB parity error
10	Bit 0 bad in first 64KB
11	Bit 1 bad in first 64KB
12	Bit 2 bad in first 64KB
13	Bit 3 bad in first 64KB
14	Bit 4 bad in first 64KB
15	Bit 5 bad in first 64KB
16	Bit 6 bad in first 64KB
17	Bit 7 bad in first 64KB
18	Bit 8 bad in first 64KB
19	Bit 9 bad in first 64KB
1A	Bit 10 bad in first 64KB
1B	Bit 11 bad in first 64KB
1C	Bit 12 bad in first 64KB
1D	Bit 13 bad in first 64KB
1E	Bit 14 bad in first 64KB
1F	Bit 15 bad in first 64KB
20	Slave DMA register bad
21	Master DMA register bad
22	Master interrupt-mask register bad
23	Slave interrupt-mask register bad
25	Loading interrupt vectors
27	Keyboard-controller test failed
28	CMOS RAM battery bad
29	CMOS configuration validation in progress
2B	Video-memory test failed
2C	Video initialization failure
2D	Video-retrace failure
2E	Searching for a video ROM
30	Switching to video ROM
31	Monochrome operation OK
32	Color (CGA) operation OK
33	Color operation OK
34	Timer-tick interrupt in progress (or bad)
35	CMOS shutdown test in progress (or bad)
36	Gate A20 bad
37	Unexpected interrupt in protected mode
38	RAM test in progress or high address line is bad
3A	Interval timer channel 2 bad
3B	Time-of-day test bad
3C	Serial-port test bad
3D	Parallel -port test bad
3E	Math co-processor test bad
3F	Cache-memory test bad

Tabella HP Pavillion

02	Verify real mode
03	Disable NMI
04	Get processor type
06	Initialize system hardware
08	Initialize chipset with POST values
09	Set IN-POST flags
0A	Initialize CPU registers
0B	Enable CPU registers
0C	Initialize cache to POST values
0E	Initialize I/O component
0F	Initialize local IDE bus
10	Initialize power management
11	Load alternate registers
12	Restore CPU control word during warm boot
13	Initialize PCI bus mastering devices
14	Initialize keyboard controller
16	BIOS ROM checksum
17	Initialize cache before memory size
18	Initialize 8254 timer
1A	Initialize DMA controller
1C	Reset PIC
20	Test DRAM refresh
22	Test 8742 keyboard controller
24	Set ES segment register to 4GB
26	Enable A-20 line
28	Autosize DRAM
29	Initialize POST memory manager
2A	Clear 512K base RAM
2C	RAM address line failure
2E	RAM data failure, low byte
2F	Enable cache before BIOS shadow
30	RAM data failure, high byte
32	Test CPU, BUS clock frequency
33	Initialize POST dispatch manager
34	Test CMOS RAM
35	Initialize alternate chipset registers
36	Warm start shut-down
37	Reinitialize chipset (MB only)
38	Shadow system BIOS ROM
39	Reinitialize cache (MB only)
3A	Autosize cache
3C	Configure advanced chipset registers
3D	Load alternate registers new CMOS values
40	Set initial CPU speed
42	Initialize interrupts
44	Initialize BIOS interrupts
45	POST device initialization
46	Check ROM copyright notice
47	Initialize manager for PCI option ROM’s
48	Check video config against CMOS
49	Initialize manager for PCI option ROM’s
4A	Initialize all video adapters
4B	Display quiet boot screen
4C	Shadow video BIOS
4E	Display BIOS copyright notice
50	Display CPU type & speed
51	Initialize
52	Test keyboard
54	Set key click if enabled
56	Enable keyboard
58	Test for unexpected interrupts
59	Initialize POST display service
5A	Display “Press F2 to Enter Setup”
5B	Disable CPU cache
5C	Test RAM, 512-640K
60	Test extended memory
62	Test extended memory address lines
64	Jump to user patch 1
66	Configure advanced cache registers
67	Initialize multi-processor APIC
68	Enable external & processor caches
69	Set up SMM area
6A	Display external L2 cache size
6C	Display shadow area message
6E	Display high address for UMB recovery
70	Display error message
72	Check for configuration errors
74	Test real time clock
76	Check for keyboard errors
7A	Test for key lock on
7C	Set up hardware interrupt vectors
7E	Initialize coprocessor, if present
80	Disable onboard super I/O ports
81	Late POST device initialization
82	Detect & install external RS-232 ports
83	Configure non-MDC IDE controllers
84	Detect & install external parallel ports
85	Initialize PnP ISA devices
86	Reinitialize onboard I/O ports
87	Configure motherboard configurable devices
88	Initialize BIOS data area
89	Enable NMI’s
8A	Initialize extended BIOS data area
8B	Test & initialize PS/2 mouse
8C	Initialize floppy controller
8F	Determine number of ATA drives
90	Initialize hard disk controllers
91	Initialize local BUS HD controllers
92	Jump to user patch 2
93	Build MPTABLE for multiprocessor boards
94	Disable A-20 line
95	Install CD-ROM for boot
96	Clear huge ES segment register
97	Fix up multiprocessor table
98	Search for options ROM’s
99	Check for smart drive
9A	Shadow ROM option
9C	Set up power management
9E	Enable hardware interrupts
9F	Determine number of ATA & SCSI drives
A0	Set time of day
A2	Check key lock
A4	Initialize typematic rate
A8	Erase F2 prompt
AA	Scan for F2 keystroke
AC	Enter SETUP
AE	Clear IN-POST flag
B0	Check for errors
B2	POST done, prepare for boot
B4	One short beep before boot
B5	Terminate quiet boot
B6	Check password (optional)
B8	Clear global descriptor table
B9	Clean up all graphics
BA	Initialize DMI parameters
BB	Initialize PnP option ROM’s
BC	Clear parity checkers
BD	Display multi boot menu
BE	Clear screen optional
BF	Check virus and backup reminders
C0	Try to boot with Int 19
C1	Initialize POST error manager
C2	Initialize error logging
C3	Initialize error display function
C4	Initialize system error handler
E0	Initialize the chipset
E1	Initialize the bridge
E2	Initialize the processor
E3	Initialize system timer
E4	Initialize system I/O
E5	Check force recovery boot
E6	Checksum BIOS ROM
E7	Got to BIOS
E8	Set huge segment
E9	Initialize multiprocessor
EA	Initialize OEM special code
EB	Initialize PIC & DMA
EC	Initialize memory type
ED	Initialize memory type
EE	Shadow boot block
EF	System memory test
F0	Initialize interrupt vectors
F1	Initialize runtime clock
F2	Initialize video
F3	Initialize beeper
F4	Initialize BOOT
F5	Clear huge segment
F6	Boot to mini-DOS
F7	Boot to full DOS

Tabella Phoenix BIOS

02	Verify real mode
03	Disable non-maskable interrupt (NMI)
04	Get CPU type
06	Initialize system hardware
07	Disable shadow and execute code from the ROM
08	Initialize chipset with initial POST values
09	Set IN POST flag
0A	Initialize CPU registers
0B	Enable CPU cache
0C	Initialize caches to initial POST values
0E	Initialize I/O component
0F	Initialize the local bus IDE
10	initialize power management
11	Load alternate registers with initial POST values
12	Restore CPU control word during warm boot
13	Initialize PCI bus mastering devices
14	Initialize keyboard controller
16	BIOS ROM checksum
17	Initialize cache before memory autosize
18	8254 programmable interrupt timer initialization
1A	8237 DMA controller initialization
1C	Reset programmable interrupt controller
20	Test DRAM refresh
22	Test 8742 keyboard controller
24	Set ES segment register to 4GB
26	Enable gate A20 line
28	Autosize DRAM
29	Initialize POST memory manager
2A	Clear 512KB base RAM
2C	RAM failure on address line xxxx
2E	RAM failure on data bits xxxx of low byte of memory bus
2F	Enable cache before system BIOS shadow
30	RAM failure on data bits xxxx of high byte of memory bus
32	Test CPU bus clock frequency
33	Initialize Phoenix Dispatch Manager
36	Warm start shut down
38	Shadow system BIOS ROM
3A	Autosize cache
3C	Advanced configuration of chipset registers
3D	Load alternate registers with CMOS values
41	Initialize extended memory for RomPilot
42	Initialize interrupt vectors
45	POST device initialization
46	Check ROM copyright notice
47	Initialize I20 support
48	Check video configuration against CMOS
49	Initialize PCI bus and devices
4A	Initialize all video adapters in system
4B	QuietBoot start (optional)
4C	Shadow video BIOS ROM
4E	Display BIOS copyright notice
4F	Initialize MultiBoot
50	Display CPU type and speed
51	Initialize EISA board
52	Test keyboard
54	Set key click if enabled
55	Enable USB devices
58	Test for unexpected interrupts
59	Initialize POST display service
5A	Display prompt “Press F2 to enter SETUP”
5B	Disable CPU cache
5C	Test RAM between 512KB and 640KB
60	Test extended memory
62	Test extended memory address lines
64	Jump to UserPatch1
66	Configure advanced cache registers
67	Initialize Multi Processor APIC
68	Enable external and CPU caches
69	Setup system management mode (SMM) area
6A	Display external L2 cache size
6B	Load custom defaults (optional)
6C	Display shadow area message
6E	Display possible high address for UMB recovery
70	Display error messages
72	Check for configuration errors
76	Check for keyboard errors
7C	Set up hardware interrupt vectors
7D	Initialize Intelligent System Monitoring
7E	Initialize coprocessor if present
80	Disable onboard super I/O ports and IRQ’s
81	Late POST device initialization
82	Detect and install external RS232 ports
83	Configure non-MCD IDE controllers
84	Detect and install external parallel ports
85	Initialize PC compatible PnP ISA devices
86	Reinitialize onboard I/O ports
87	Configure motherboard configurable devices (optional)
88	Initialize BIOS data area
89	Enable non-maskable interrupts (NMI’s)
8A	Initialize extended BIOS data area
8B	Test and initialize PS/2 mouse
8C	Initialize floppy controller
8F	Determine number of ATA drives (optional)
90	Initialize hard disk controllers
91	Initialize local bus hard disk controllers
92	Jump to UserPatch2
93	Build MPTABLE for multi processor boards
95	Install CD ROM for boot
96	Clear huge ES segment register
97	Fixup multi processor table
98	Search for option ROM’s
99	Check for SMART drive (optional)
9A	Shadow option ROM’s
9C	Set up power management
9D	Initialize security engine (optional)
9E	Enable hardware interrupts
9F	Determine number of ATA and SCSI drives
A0	Set time of day
A2	Check key lock
A4	Initialize typematic rate
A8	Erase F2 prompt
AA	Scan for F2 key stroke
AC	Enter setup
AE	Clear boot flag
B0	Check for errors
B1	Inform RomPilot about the end of POST
B2	POST done – prepare to boot operating system
B4	One short beep
B5	Terminate QuietBoot (optional)
B6	Check password
B7	Initialize ACPI BIOS
B9	Prepare boot
BA	Initialize DMI parameters
BB	Initialize PnP option ROM’s
BC	Clear parity checkers
BD	Display multiboot menu
BE	Clear screen
BF	Check virus and backup reminders
C0	Try to boot with interrupt 19
C1	Initialize POST Error Manager (PEM)
C2	Initialize error logging
C3	Initialize error display function
C4	Initialize system error handler
C5	PnP dual CMOS (optional)
C6	Initialize notebook docking (optional)
C7	Initialize notebook docking late
C8	Force check (optional)
C9	Extended checksum (optional)
CA	Redirect Int 15h to enable remote keyboard
CB	Redirect Int 13 to Memory Technologies Devices such as ROM, RAM, PCMCIA, and serial disk
CC	Redirect Int 10h to enable remote serial video
CD	Re-map I/O and memory for PCMCIA
CE	Initialize digitizer and dispaly message
D2	Unknown interrupt
	The following are for boot block in Flash ROM
E0	Initialize the chipset
E1	Initialize the bridge
E2	Initialize the CPU
E3	Initialize the system timer
E4	Initialize system I/O
E5	Check force recovery boot
E6	Checksum BIOS ROM
E7	Go to BIOS
E8	Set Huge Segment
E9	Initialize Multi Processor
EA	Initialize OEM special code
EB	initialize PIC and DMA
EC	Initialize Memory type
ED	Initialize Memory size
EE	Shadow Boot Block
EF	System memory test
F0	Initialize interrupt vectors
F1	Initialize Run Time Clock
F2	Initialize video
F3	Initialize System Management Menager
F4	Output one beep
F5	Clear Huge Segement
F6	Boot to mini DOS
F7	Boot to Full DOS