Kontron KTT20-pITX Bedienungsanleitung PDF herunterladen (Seite 40)

KTD-S0045-D Page 36 Linux® BSP

KTT20/pITX Software Guide

67 DACR Sidetone

None

68 DACL Sidetone

None

69 Right Capture Mux

Right

70 Left Capture Mux

Left

71 ADC Input

ADC

72 Right Input Mode Mux

Single-Ended

73 Right Input Inverting Mux

IN1R

74 Right Input Mux

IN1R

75 Left Input Mode Mux

Single-Ended

76 Left Input Inverting Mux

IN1L

77 Left Input Mux

IN1L

78 Int Spk Switch

9.4 PCI Express

Interface

Some mini PCI Express

cards cause a malfunction (e.g. card not detected or interrupt assignment not pos-

sible). One way to bypass this issue is to decrease the clock frequency. For this purpose you can expand the

U-Boot environment with a new kernel argument

low_pcie_freq.

Observe the following procedure:

Interrupt the kernel boot process in U-Boot.

Type editenv bootargs.base and press Enter.

Add a space and then the new argument. Press Enter.

Type saveenv and press Enter.

Example:

Kontron KTT20 # editenv bootargs.base

edit: mem=1024M@0M console=ttyS0,115200n8 console=tty0 lp0_vec=0x2000@0x1C406000 low_pcie_freq

Kontron KTT20 # saveenv

Saving Environment to SPI Flash...

SF: Detected SST25VF032B with page size 4096, total 4 MiB

Erasing SPI flash...Writing to SPI flash...done

Kontron KTT20 #

In the same way you can remove this new argument with the backspace key.

9.5 CPU Frequency Management

Linux

uses as default the frequency setting Ondemand which is not optimal for some applications (e.g.

video decoding). The Linux

applet indicator-cpufreq provides four different CPU frequency modes:

Conservative, Ondemand, Powersave and Performance.

Download this tool with the following terminal commands:

(sudo) add-apt-repository ppa:artfwo/ppa

(sudo) apt-get update

(sudo) apt-get install indicator-cpufreq

After download you should reboot the operating system.

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