GE TELUM ASLP11, Справочное руководство

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On the rear side of the PCB there are several more LEDs showing the status of
various interfaces. They cannot be viewed from the front, but may be helpful
for debug purposes. There are the link/activity (green/amber) status of Ethernet
channel 0 (‘E0’) and Ethernet channel 1 (‘E1’), the PCIe host link towards the
PCIe switch (‘HL’, green x1 or x4, amber x8) and the PCIe link towards the
AMC interconnect (‘AL’, green x1 or x4, amber x8) and the BIOS controlled
status LED (‘ST’). This LED shows the same information than the bicolor front
panel LED, but isn’t controlled via IPMI when booting the operating system. It
also shows the short red blinks every second when the CPU gets too hot and the
internal throttle function has been activated. Whenever the ASLP11 does not
complete its BIOS bootup sequence, this LED also shows the postcode in
blinking it serialized.
The status LED for the PCIe host link ‘HL’ and PCIe AMC link ‘AL’ are not
mounted when the PCIe switch isn’t mounted via order.
Booting
When switching-on the ASLP11 the following steps are done by hardware:
- On the ASLP11 family, all voltages at the carrier are observed until they reach
a first trip point which is 2.9 V at the 12 V rail.
- The continuous red fault LED (FLT) shows that all circuitry is in reset
- All onboard DC/DC converters are ramped up
- If all onboard supply voltages are at their correct values, the powergood status
is acknowledged to all onboard devices and the red fault LED (FLT) is
switched off
- After this the CPU starts reading the first instructions from BIOS. Very soon
the bicolor LED (USR1) is programmed to a red blinking state and the first
postcode is issued
- If the CPU does not start correctly, the red fault LED (FLT) keeps off until the
hardware watchdog will issue a further reset around 1.6 seconds later. You can
see this at the red fault LED (FLT), which is on again for a short moment. This
sequence continues until the CPU starts correctly.
For reference the BIOS boot sequence is shown with the former BIOS version.
This version is a rather early one and hopefully some of the long periods will
speed up. The times depend mainly on the memory size and they are measured
with 1GB and quick boot enabled. All postcodes are shown in hex.
GE Intelligent Platforms – ASLP11 Hardware Reference Manual, Third Edition Page 32