Compaq AlphaServer DS20 Service Manual Page 25
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- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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System Overview 1-15
Memory Addressing
The first address of each bank is one above the ending address of the previous bank.
Example 1–1 and Figure 1-8 show the starting address of each memory bank using
either the SRM console or AlphaBIOS.
Example 1–1 Show Memory
P00>>> show memory
Array # Size Base Addr
------- ---------- ---------
0 128 MB 000000000
1 128 MB 008000000
2 128 MB 010000000
3 128 MB 018000000
Total Bad Pages = 0
Total Good Memory = 512 MBytes
P00>>>
Figure 1-8 Memory Configuration
Dis
p
la
y
S
y
stem Confi
g
uration F1= Hel
p
S
y
stemboard Confi
g
uration
Hard Disk Confi
g
uration
PCI Confi
g
uration
SCSI Confi
g
uration
ISA Confi
g
uration
Memor
y
Confi
g
uration
Inte
g
rated Peri
p
herals
Sy
stem Memor
y
C
onfi
g
uration
Bank 0: 128 MB
(
32 MB
p
er DIMM
)
-- Startin
g
Address = 0x00000000
Bank 1: 128 MB
(
32 MB
p
er DIMM
)
-- Startin
g
Address = 0x80000000
Bank 2: 128 MB
(
32 MB
p
er DIMM
)
-- Startin
g
Address = 0x10000000
Bank 3: 128 MB
(
32 MB
p
er DIMM
)
-- Startin
g
Address = 0x18000000
ESC =Exit
DIMM Contents
Figure 1-7 shows the data contents of each DIMM in memory. Odd data bytes are in
DIMMs below the cross-bar switch chipset, and the even data bytes are in the DIMMs
above the cross-bar switch chipset.
- 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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