User`s guide

NVRAM Partitioning
E.1 SSC RAM Layout
E.1.1.1 Console Program MailBoX (CPMBX)
The Console Program MailBoX (CPMBX) comprised of NVR0, is a software
data structure located at the beginning of NVRAM (20140400). The CPMBX is
used to pass information between the CPU firmware and diagnostics, VMB, or
an operating system.
Figure E–2 NVR0 (20140400) : Console Program MailBoX (CPMBX)
76543210
NVR0
MLO-008657
BIPRIP
LANGUAGE HLT_ACT
Table E–1 Bit Functions for NVR0
Field Name Description
7:4 LANGUAGE This field specifies the current selected language for displaying
halt and error messages on terminals which support MCS.
3 RIP If set, a restart attempt is in progress. This flag must be
cleared by the operating system, if the restart succeeds.
2 BIP If set, a bootstrap attempt is in progress. This flag must be
cleared by the operating system if the bootstrap succeeds.
1:0 HLT_ACT Processor halt action - this field in conjunction with the
conditions specified for system halts is used to control the
automatic restart/bootstrap procedure. HLT_ACT is normally
written by the operating system.
0 : Restart; if that fails, reboot; if that fails, halt.
1 : Restart; if that fails, halt.
2 : Reboot; if that fails, halt.
3 : Halt.
E.1.1.2 Terminal Status
Figure E–3 NVR1 (20140401)
76543210
CRTMCSNVR1
MLO-008653
E–2 NVRAM Partitioning