MPE/iX System Utilities Reference Manual (32650-90882)

Chapter 25 215
STANDARDS
The initial system loader
A detailed internal representation of a boot or console path (the format applies to the auto
bootpath, the alternate boot path, the dump path, and the console path) is as follows:
Note that in the above illustration, the flags field in the console path is ignored. The format
of flags is as follows:
Format of flags
Console Path
This 32-byte field defines the device path that PDC uses to locate the system console. If
this path is not valid, or if the device that it describes is not a valid console device image,
PDC then uses a default path.
Alternate Boot Path
This 32-byte field defines the coldload path that PDC uses (after getting the go-ahead from
the operator) if the operator rejects the autoboot path through console intervention. If this
path is not valid, or if the device it describes is not a valid boot device containing an IPL
image, PDC then requests a valid path through the console.
Dump flags and device
This 32-byte field is used to describe the destination device for a snapshot dump facility.
The format of nonvolatile memory is shown below:
Table 25-2. Boot or console path
0000 flags BC(0) BC(1) BC(2)
0004 BC(3) BC(4) BC(5) MOD
0008 Logical_ID
000C Device_Depend
001F
0020
Table 25-3. Format of flags
0 1 2-3 4 through 7
ab as 00 timer
Table 25-4. Nonvolatile memory
BYTE CONTENTS
0-63 PDC and boot reserved
64-nn OS reserved