Microsoft KB Archive/106554

= Err Msg: Inaccessible Boot Device Using the BusLogic BT-542B =

Article ID: 106554

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Advanced Server 3.1
 * Microsoft Windows NT Workstation 3.1
 * Microsoft Windows NT Advanced Server 3.1

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This article was previously published under Q106554



SYMPTOMS
When you configure Windows NT to use the BusLogic BT-542B SCSI host adapter, you may receive the following STOP message after you restart the system:

STOP: 0x0000007B (parameter, parameter, parameter, parameter) INACCESSIBLE_BOOT_DEVICE



CAUSE
This problem may occur because the BusLogic SCSI adapter is configured incorrectly. The BT-542B can be configured to use both an AT IRQ setting and a Host IRQ setting. These must match for Windows NT to correctly access any devices attached to the adapter.

NOTE: There may be other causes for the above error message.



RESOLUTION
To eliminate the error message and use Windows NT, set the AT IRQ and Host IRQ to the same IRQ.



MORE INFORMATION
The following tables are configuration settings for the BusLogic BT-542B SCSI host adapter:

SWITCH BAY 1
SCSI ID SW1  SW2  SW3 0       OFF  OFF  OFF 1       ON   OFF  OFF 2       OFF  ON   OFF 3       ON   ON   OFF 4       OFF  OFF  ON 5        ON   OFF  ON 6        OFF  ON   ON 7        ON   ON   ON

SW4 SCSI PARITY ENABLE/DISABLE

SW5 DISK > 1GB and not SCO UNIX ENABLE/DISABLE

SW6 SCSI SYNCHRONIZATION NEGOTIATION ENABLE/DISABLE

DMA CHANNEL SW7  SW8 DISABLE     OFF  OFF 5           ON   ON 6            OFF  ON 7            ON   OFF

SWITCH BAY 2
I/O ADDRESS  SW1   SW2   SW3 Reserved     OFF   OFF   OFF 134H-137H    ON    OFF   OFF 234H-237H    OFF   ON    OFF 334H-337H    ON    ON    OFF Reserved     OFF   OFF   ON 130H-133H     ON    OFF   ON 230H-233H     OFF   ON    ON 330H-333H     ON    ON    ON

BIOS BASE ADDRESS  SW4   SW5 0C8000H            OFF   OFF Disable            ON    OFF 0D8000H            OFF   ON 0DC000H             ON    ON

AT IRQ   SW6   SW7   SW8 Reserved OFF   OFF   OFF Reserved ON    OFF   OFF 15       OFF   ON    OFF 14       ON    ON    OFF 12       OFF   OFF   ON 9         ON    OFF   ON 10        OFF   ON    ON 11        ON    ON    ON

JUMPER SETTINGS

HOST IRQ W3   W4   W5   W6   W7   W8 9         OFF  OFF  OFF  OFF  OFF  ON 10        OFF  OFF  OFF  OFF  ON   OFF 11       OFF  OFF  OFF  ON   OFF  OFF 12       OFF  OFF  ON   OFF  OFF  OFF 13       OFF  ON   OFF  OFF  OFF  OFF 15       ON   OFF  OFF  OFF  OFF  OFF

HOST BUS TRANSFER RATE W11  W13 5.0 MB/SEC. OFF OFF 5.7 MB/SEC. OFF ON 6.7 MB/SEC. ON  OFF 8.0 MB/SEC. ON  ON

W17 HOST I/O CNANNEL READY ENABLE/DISABLE

FLOPPY I/O ADDRESS          W14 PRIMARY (3FX)    OFF SECONDARY (37X)  ON

FLOPPY CONTROLLER W15  W16 DISABLE    OFF  OFF ENABLE     ON   ON

Additional query words: prodnt blue trap

Keywords: kbhardware kbsetup KB106554

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