Power-Up 2-5
XSROM code resides in sector 0 of FEPROM 0 on the XBUS. Sector 2 of FEPROM
0 contains a duplicate copy of the code and is used if sector 0 is corrupt. Code for
sizing DIMM memory resides in sector 1 of FEPROM 0 along with the PAL code.
FEPROM. Two 1-Mbyte programmable ROMs (FEPROMS) are on the XBUS on
PCI0. FEPROM 0 contains two copies of the XSROM, the OpenVMS and DIGITAL
UNIX PAL code, and the SRM console and decompression code. FEPROM 1
contains the AlphaBIOS and NT PAL code. See Figure 2-3. These two FEPROMs
can be flash updated. Refer to Appendix A.
Figure 2-3 Contents of FEPROMs
FEPROM 0
FEPROM 1
XSROM
and
Fail Safe ldr
XSROM
and
Fail Safe ldr
Pal Code
0
1
2
3
16
AlphaBIOS
Code
Decompress
SRM
Console
Code
Sector
64Kb
64Kb
64Kb
64Kb
1 Mbyte
PKW0515-97
XSROM DIMM
