Espi - Kontron COMh-sdID User Manual

SQI flash device can be up to 64 MB (512 Mb). Two flash devices may be used on the Module, allowing
up to 128 MB of boot code storage on the Module. Alternatively there may be a flash device on the
Carrier and / or on the Module, for a combined total of up to 128 MB. In most situations, only one flash
device, either on the Module or on the Carrier, is used.
An external BIOS ROM can be placed on the carrier and connected via QSPI. Boot source is selected
by pulling BSEL [2:0] pins low on the COM-HPC carrier (pull-up on module). BSEL is decoded by the EC
(embedded controller) which controls a multiplexer IC via SPI_CS_SEL[1:0] to assign the chip selects
from the PCH to their designation.
BSEL Coding
Usage
BSEL 2 BSEL 1 BSEL 0 SPI_CS_SEL1 SPI_CS_SEL0 SPI_CS1# SPI_CS0#
Internal Boot 1 1
External Boot 1 1
Do not use 1 0
Do not use 1 0
Do not use 1
0
Do not use 0 1
Do not use 0 0
Do not use 0 0
Table 19: BIOS Boot options on the COMh-sdID

3.4.10 eSPI

COM-HPC supports an eSPI port for general purpose I/O. The eSPI interface (like LPC before it) can be
useful for general purpose devices such as Carrier Super I/O devices, Carrier CPLDs or FPGAs,
hardware monitoring devices, and others. It is also possible to boot the BIOS over eSPI. The eSPI bus
runs from a 1.8V supply. COM-HPC does not support LPC.
The COMh-sdID supports following eSPI interface:
SOC (Master) EC (Slave 0) COM-HPC Connector (Slave 1)
ESPI_CLK ESPI_CLK
ESPI_RESET# ESPI_RESET# ESPI_RST#
ESPI_IO_[0:3] ESPI_IO[0:3]
ESPI_CS0# ESPI_CS#
ESPI_CS1# -
ESPI_ALERT0# ESPI_ALERT# -
ESPI_ALERT1# -
ESPI_CS1# and ESPI_ALERT1# on the COM-HPC connector are just terminated but not
connected to other platform devices.
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EC Control Outputs
1 1
0 0
1 1
0 1
1 1
0 1
1 1
0 1
ESPI_CLK
ESPI_IO[0:3]
-
ESPI_CS0#
ESPI_ALERT0#
PCH CS Assignment
0 Carrier Module
1 Module Carrier
0 Carrier Module
0 Carrier Module
Carrier Module
0
0 Carrier Module
0 Carrier Module
0 Carrier Module
COMh-sdID User Guide
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