i.MX ProcessorsのトピックRe: Problems with syscall adjtimex on Android https://community.nxp.com/t5/i-MX-Processors/Problems-with-syscall-adjtimex-on-Android/m-p/180328#M7534 <HTML><HEAD></HEAD><BODY><P>I don´t know enough regarding ptp-v2 or adjtimex, but in my point of view, you cannot compare desktop or raspberry pi power management strategies with imx6 sabre sd.</P><P></P><P>It looks like adjtimex will change core clock/voltage in order to test something (or even get measurements), but you cannot set any clock value, as I know (you can choose between a range, or some values).</P><P></P><P>Could you, please, detail the clock behavior you´ve been expecting from imx6 sd? </P></BODY></HTML> Tue, 08 Jan 2013 15:51:29 GMT daiane_angolini 2013-01-08T15:51:29Z Problems with syscall adjtimex on Android https://community.nxp.com/t5/i-MX-Processors/Problems-with-syscall-adjtimex-on-Android/m-p/180327#M7533 <HTML><HEAD></HEAD><BODY><P>we ported an open source implementation of ptp-v2 (<A href="http://code.google.com/p/ptpv2d/" target="_blank">http://code.google.com/p/ptpv2d/</A>) to the android sabre-sd platform.</P><P>the same code runs good between two desktops or one desktop and a raspberry pi.</P><P>running on the sabre board we get very bad timing values:</P><P>- to adjust the clock in linux the program uses settimeofday to adjust big differences,</P><P>- and the syscall adjtimex, with modes ADJ_FREQUENCY to fine tune the frequency of the kernel clock (which we had to add to android libc).</P><P></P><P>we are no kernel experts and are wondering if adjtimex works as expected on this board/kernel.</P><P></P><P>do you have experience with ptp and or the clock behavior on the sabre-sd board in linux or android?</P><P></P><P>regards</P><P></P><P>christian</P><P></P><P>p.s.: we are using your android sdk 13.4</P><P><SPAN class="mce_paste_marker"><BR /></SPAN></P></BODY></HTML> Mon, 19 Nov 2012 12:48:50 GMT https://community.nxp.com/t5/i-MX-Processors/Problems-with-syscall-adjtimex-on-Android/m-p/180327#M7533 christianköstli 2012-11-19T12:48:50Z Re: Problems with syscall adjtimex on Android https://community.nxp.com/t5/i-MX-Processors/Problems-with-syscall-adjtimex-on-Android/m-p/180328#M7534 <HTML><HEAD></HEAD><BODY><P>I don´t know enough regarding ptp-v2 or adjtimex, but in my point of view, you cannot compare desktop or raspberry pi power management strategies with imx6 sabre sd.</P><P></P><P>It looks like adjtimex will change core clock/voltage in order to test something (or even get measurements), but you cannot set any clock value, as I know (you can choose between a range, or some values).</P><P></P><P>Could you, please, detail the clock behavior you´ve been expecting from imx6 sd? </P></BODY></HTML> Tue, 08 Jan 2013 15:51:29 GMT https://community.nxp.com/t5/i-MX-Processors/Problems-with-syscall-adjtimex-on-Android/m-p/180328#M7534 daiane_angolini 2013-01-08T15:51:29Z