Artesyn ATCA 7370 / ATCA 7370-S Installation and Use (January 2015) - Manual (Page 83)

BIOS
ATCA-7370/ATCA-7370-S Installation and Use (6806800P54H) 83
The only supported interface is Keyboard Controller Style (KCS). The IPMI base address and
interrupt is provided to OS via SMBIOS structure type38 and is tested with Linux OpenIPMI
driver.
4.1.9.1 Watchdogs
The watchdogs in ATCA-7370 are implemented by BMC watchdog.
The BIOS uses BMC watchdog in two phases.
 BIOS phase
 OS phase
The BMC watchdog for BIOS phase is started by the BMC automatically after the payload board
is powered on. The BIOS can disable BMC watchdog through the BIOS setup menu. If BMC
watchdog for BIOS is enabled, it will be disabled when BIOS setup menu is invoked boot to shell
or boot to OS. Timer value for BIOS phases is also configurable through BIOS setup menu. The
default time value is set to three minutes and the BMC watchdog for BIOS phase is enabled by
default.
The BIOS can disable the BMC watchdog for OS loading phases through the BIOS setup. Timer
value for OS loading phases is also configurable through the BIOS setup. The default timer value
is five minutes, and the BMC watchdog for OS phase is disabled by default.
If BMC watchdog times out in the BIOS phase, BMC will switch the BIOS bank.
4.1.10 SMBIOS Support
The BIOS includes SMBIOS structures according to SMBIOS 2.4 and IPMI1.5 specifications.
4.1.11 LED Behavior During POST
After power up/reset and while BIOS runs, the LEDs are used to signalize the power up/ BIOS
phases. The state of LEDs is defined so that in case of a hang, the LEDs clearly indicate in which
boot up phase the hang occurred. In general, to indicate the POST is in progress, the BIOS
toggles the user LED for every POST task it executes. After the completion of the POST, the BIOS
switches off the LEDs. The LEDs marked with B1/U1,B2/U2 and U3 are used for this purpose.