Intel MPCBL0010 manual Read the Current Reference Clock, Sysfs Interface, Reference Clock Values

Telecom Clock—MPCBL0010 SBC

12.4.15Read the Current Reference Clock

To determine the current reference clock used by the telecom clock, use the following:

Function:

IOCTL_READ_CURRENT_REF

Table 137. Reference Clock Values

Current Reference Clock	Value
Primary Clock	0
Secondary Clock	q

12.4.16sysfs Interface

When the Telecom Clock driver is loaded, it creates a sysfs directory under /sys/ devices/platform/telco_clock.

This directory exports the following interfaces as shown in Table 138 where they are mapped to Telecom Clock API functions. (See Section 12.4, “Telecom Clock API” for information about using the Telecom Clock API.)

Table 138. Telecom Clock API Function Mapping for the sysfs Interface

sysfs Interface Name (File Name)	Telecom Clock API Function Name
alarms	IOCTL_READ_ALARMS
current_ref	IOCTL_READ_CURRENT_REF
received_ref_clk3a	IOCTL_SELECT_RECEIVED_REF_CLK3A
received_ref_clk3b	IOCTL_SELECT_RECEIVED_REF_CLK3B
enable_clk3a_output	IOCTL_ENABLE_CLK3A_OUTPUT
enable_clk3b_output	IOCTL_ENABLE_CLK3B_OUTPUT
enable_clka0_output	IOCTL_ENABLE_CLKA0_OUTPUT
enable_clka1_output	IOCTL_ENABLE_CLKA1_OUTPUT
enable_clkb0_output	IOCTL_ENABLE_CLKB0_OUTPUT
enable_clkb1_output	IOCTL_ENABLE_CLKB1_OUTPUT
filter_select	IOCTL_FILTER_SELECT
hardware_switching	IOCTL_HARDWARE_SWITCHING
hardware_switching_mode	IOCTL_HARDWARE_SWITCHING_MODE
telclock_version	-
mode_select	IOCTL_MODE_SELECT
refalign	IOCTL_REFALIGN
reset	IOCTL_RESET
select_amcb1_transmit_clock	IOCTL_SELECT_AMCB1_TRANSMIT_CLOCK
select_amcb2_transmit_clock	IOCTL_SELECT_AMCB2_TRANSMIT_CLOCK
select_redundant_clock	IOCTL_SELECT_REDUNDANT_CLOCK
select_ref_frequency	IOCTL_SELECT_REF_FREQUENCY

Note: All sysfs interfaces are integers in hex format, i.e., echo 99 > refalign has the same effect as echo 0x99

	Intel NetStructure® MPCBL0010 Single Board Computer
October 2006	Technical Product Specification
Order Number: 304120	169