Specifications

BMC Messaging Interfaces QSSC-S4R Technical Product Specification
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Figure 110. BMC IPMB Message Reception
25.8 I P M I S e r i a l F e a t u r e
The I PM I 2 . 0 I n t el implemen t a t ion o f I PM I -over-serial was known as t he emergency managemen t por t (EMP)
in t er f ace be f ore I PM I 1 . 0 . The EMP nomencla t ure is no longer used . The BMC only suppor t s t erminal mode – direc t
connec t on t he serial in t er f ace .
The primary goal o f providing an ou t -o f -band RS-232 connec t ion is t o give sys t em adminis t ra t ors t he abili t y t o access
low-level server managemen t f irmware f unc t ions by using commonly available t ools . To make i t easy t o use and t o
provide high- compa t ibili t y wi t h LAN and I PMB pro t ocols , t his pro t ocol design adop t s some f ea t ures o f bo t h t he LAN
and I PMB pro t ocols .
The implemen t a t ion shares serial f unc t ion wi t h t he pla tf orm’s COM1 in t er f ace . The BMC has con t rol over which agen t
(BMC or Sys t em) has access t o COM1 . Hardware handshaking is suppor t ed as are t he Ring I ndica t e and Da t a
Carrier De t ec t signals .
See t he I n t elligen t Pla tf orm Managemen t I n t er f ace Speci f ica t ion Second Genera t ion v2 . 0 .
25.8.1 COM Port Switching
The in t egra t ed S I O is used f or Com por t sharing . It has t wo legacy UARTs and a MUX swi t ching arrangemen t t ha t
permi t s t he BMC t o moni t or and in t ercep t t he serial t ra ff ic on serial por t 1 (COM1) . No t e t ha t COM2 is no t a suppor t ed
in t er f ace f or Serial over LAN .
If I PM I -over-serial is enabled , t hen t he BMC wa t ches t he serial t ra ff ic on COM1 . This is done t o respond t o in-band
por t swi t ching reques t s .
25.8.2 Terminal Mode
The BMC suppor t s t erminal mode , as speci f ied in t he I n t elligen t Pla tf orm Managemen t I n t er f ace Speci f ica t ion Second
Genera t ion v2 . 0 . Terminal mode provides a prin t able ASC II t ex t -based way t o deliver I PM I messages t o t he BMC
over
t he serial channel or any packe t -based in t er f ace . Messages can be delivered in t wo f orms :
 Via hex-ASC II pair encoded I PM I commands
 Via t ex t SYS commands
The t erminal mode in t er f ace suppor t s a maximum I PM I message leng t h o f 40 by t es . The line con t inua t ion charac t er is
suppor t ed over t he serial channel in t erminal mode only . The line con t inua t ion charac t er is suppor t ed f or bo t h hex-
ASC
II and t ex t commands .
25.8.2.1 Input Restrictions
25.8.2.1.1 Maximum Input Length
The BMC suppor t s up t o 122 charac t ers per line . The BMC s t ops accep t ing new charac t ers and s t ops echoing inpu t
when t he 122-charac t er limi t is reached .
However , t he <ESC> , <backspace> / <dele t e> , illegal , and inpu t newline charac t ers con t inue t o be accep t ed and
handled a ft er t he charac t er limi t is reached .
25.8.2.1.2 Maximum IPMI Message Length
The t erminal mode in t er f ace suppor t s a maximum I PM I message leng t h o f 40 by t es .
25.8.2.1.3 Line Continuation Character
The line con t inua t ion charac t er is suppor t ed over t he serial channel in t erminal mode only . The line con t inua t ion
charac t er is suppor t ed f or bo t h hex-ASC II and t ex t commands .
25.8.2.2 Command Support
25.8.2.2.1 Text Commands
The BMC suppor t s all t he t ex t commands described in t he I n t elligen t Pla tf orm Managemen t I n t er f ace Speci f ica t ion
Second Genera t ion v2 . 0 .