Date: Wed, 14 Aug 2013 10:57:50 -0400 From: Yaniv Sapir <yaniv@...pteva.com> To: john-dev@...ts.openwall.com Subject: Re: Parallella: lclk_div The clk divider is essential for the 16-core Parallella Prototype boards that are configured with bitstreams released by Adapteva. However, the lclk_div4 script is not used for quite some time, since the e_reset_system() API resets the link registers. For this reason, we re-program the link registers at the reset function, if a matching system is detected - as defined in the HDF variable PLATFORM_VERSION. It may be possible that a modified bitstream will render the system unstable, if the Epiphany logic was modified, but this really requires inspecting the change. What you could try is to change the PLATFORM_VERSION to GENERIC and see if this works. I am not sure at the moment if this will have other side-effects, though. Yaniv. On Wed, Aug 14, 2013 at 9:29 AM, Solar Designer <solar@...nwall.com> wrote: > Yaniv - > > Regarding this comment by Roman: > > http://forums.parallella.org/viewtopic.php?f=13&t=422#p3205 > > I am wondering whether this line: > > sudo /home/linaro/work/scr/lclk_div4.elf > > in rc.local on the Parallella prototype that we're using could actually > be obsolete with the new bitstream and eSDK. Should we keep it or > should we remove it? Can it be causing reliability problems (if kept? > or if removed?) > > What is the purpose of this clock divider, and what does it do exactly? > > Thanks, > > Alexander > -- =========================================================== Yaniv Sapir Adapteva Inc. 1666 Massachusetts Ave, Suite 14 Lexington, MA 02420 Phone: (781)-328-0513 (x104) Email: yaniv@...pteva.com Web: www.adapteva.com ============================================================ CONFIDENTIALITY NOTICE: This e-mail may contain information that is confidential and proprietary to Adapteva, and Adapteva hereby designates the information in this e-mail as confidential. The information is intended only for the use of the individual or entity named above. If you are not the intended recipient, you are hereby notified that any disclosure, copying, distribution or use of any of the information contained in this transmission is strictly prohibited and that you should immediately destroy this e-mail and its contents and notify Adapteva. ============================================================== Content of type "text/html" skipped
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