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Halts, Console Commands, and Environment Variables A-9
Table A-3 Environment Variable Summary (Continued)
Environment
Variable Function
memory_test Specifies the extent to which memory will be tested. For
Compaq Tru64 UNIX systems only.
ocp_text Overrides the default OCP display text with specified text.
os_type Specifies the operating system and sets the appropriate console
interface.
pci_parity Disables or enables parity checking on the PCI bus.
pk*0_fast Enables fast SCSI mode.
pk*0_host_id Specifies the default value for a controller host bus node ID.
pk*0_soft_term Enables or disables SCSI terminators on systems that use the
QLogic ISP1020 SCSI controller.
sys_model_num Displays the system model number and computes certain
information passed to the operating system. Must be restored
after the system board is replaced.
sys_serial_num Restores the system serial number. Must be set if the system
board is replaced.
sys_type Displays the system type and computes certain information
passed to the operating system. Must be restored after the
system board is replaced.
tga_sync_green Specifies the location of the SYNC signal generated by the
DIGITAL ZLXp-E PCI graphics accelerator option.
tt_allow_login Enables or disables login to the SRM console firmware on
other console ports.
- AlphaServer DS20 1
- Contents 3
- Chapter 3 Error Registers 4
- Appendix C Firmware Update 5
- Examples 5
- Intended Audience 9
- Document Structure 9
- Documentation Titles 10
- Information on the Internet 10
- System Overview 11
- Chapter 1 11
- System Enclosure 12
- PKW-0501-97 14
- System Consoles 16
- System Architecture 18
- CPU Types 20
- Figure 1-6 Memory Placement 22
- PK1488-98 24
- Example 1–1 Show Memory 25
- Interrupts 28
- Table 1-1 PCI Slot Numbering 31
- PK1410-99 32
- Table 1-2 Switchpack 2 33
- Table 1-3 Switchpack 3 33
- Server Feature Module 34
- 1.9.1 Power Control Logic 36
- PK1493-98 38
- Power Supply 40
- Power Up/Down Sequence 42
- Maintenance Bus (I 46
- Error State 47
- StorageWorks Drives 48
- System Overview 1-39 49
- Chapter 2 51
- Troubleshooting 51
- Testing an Entire System 59
- Other Useful Console Commands 61
- Troubleshooting with LEDs 62
- Compaq Analyze 64
- Continued on next page 67
- Table 2-2 Types of Errors 69
- Releasing Secure Mode 70
- Chapter 3 71
- Error Registers 71
- Ibox Status Register - I_STAT 72
- MM_STAT 73
- PK1416-99 75
- Cbox Read Register 77
- Miscellaneous Register (MISC) 79
- PK1418-99 82
- Pchip Error Register (PERROR) 83
- Failure Register 86
- Table 3-8 Failure Register 87
- Function Register 88
- Table 3-9 Function Register 89
- Chapter 4 91
- Removal and Replacement 91
- FRU List 92
- System Access 96
- CPU Removal and Replacement 98
- Figure 4-4 Removing Memory 100
- System Board 102
- Slot Cover 104
- Option Card 104
- Replacement 106
- PK1404-99 110
- PK1481 - 9 114
- Module Guides 116
- PKW0519A-97 118
- ➊ in Figure 119
- Replacement 120
- Figure 4-15 Removing CD-ROM 122
- PK1401-98 124
- PKW0501B-97 126
- PK1412-99 130
- Appendix A 133
- Halts, Console Commands, and 133
- Environment Variables 133
- Halt Button Functions 134
- Using the Halt Button 135
- Halt Assertion 136
- Appendix B 145
- Managing the System Remotely 145
- RCM Overview 146
- First-Time Setup 147
- ➊ in Example 148
- RCM Commands 149
- Using the RCM Switchpack 154
- Troubleshooting Guide 157
- Appendix C 159
- Firmware Update 159
- PK1461-98 160
- Diskettes 166
- Update 168
- (Continued) 170
- Internal Floppy Disk 171
- C.1.5 LFU Commands 176
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