From: Steve S. <sa...@gm...> - 2012-03-20 13:47:31
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On Fri, Mar 16, 2012 at 10:08 AM, Patrick Maheral (DWI - CA/Ottawa) <Pat...@dr...> wrote: > Just noticed an entry in the Linux kernel 3.1 Changelog labeled: > > omap-serial: Allow IXON and IXOFF to be disabled. > > That looks like it would cause the problem I'm seeing. I've > Install a 3.2 kernel and will test to see if the zero bytes > are transmitted. That bug does look like it could potentially cause the type of issues you are seeing. I've added the patch to my omap-3.0-pm branch: http://www.sakoman.com/cgi-bin/gitweb.cgi?p=linux-omap-2.6.git;a=commitdiff;h=f77d38b6ccbd9cb1e4e5fe92f7dd939b9f6f86d9 Builds of my GNOME and console images now include this patch: http://www.sakoman.com/category/8-gnome-daily-builds-r13.html Let me know if this improves the situation for you. Steve >> -----Original Message----- >> From: Brad Midgley [mailto:bmi...@gm...] >> Sent: March 16, 2012 12:29 >> To: General mailing list for gumstix users. >> Subject: Re: [Gumstix-users] serial driver & high uart rates >> >> this sounds like something gumstix should take up with TI >> >> On Fri, Mar 16, 2012 at 7:07 AM, Patrick Maheral (DWI - CA/Ottawa) >> <Pat...@dr...> wrote: >> >> -----Original Message----- >> >> From: Brad Midgley [mailto:bmi...@gm...] >> >> >> >> maybe someone at gumstix could comment on the driver situation. We >> >> could confirm corruption by looking at the hcidump output and >> >> comparing it to what is actually sent over the uart. I don't have a >> >> setup to spy on the uart though. >> >> >> > >> > We did a bit of testing yesterday with the CPU speed. We >> are processing >> > receiving about 100 bursts of data per second. At a core >> speed of 125MHz, >> > we see the zero's being transmitted once or twice a second. >> At a core >> > speed of 250MHz, this drops down to once or twice a minute. >> There is >> > very little (if any) improvement at 500MHz. >> > >> > I'll post here as I find more info. I have a suspicion >> that it might be >> > XON/XOFF characters being transmitted by the UART even >> though, AFAIK, >> > software flow control is turned off. >> > >> > Patrick >> > >> > >> > >> -------------------------------------------------------------- >> ---------------- >> > This SF email is sponsosred by: >> > Try Windows Azure free for 90 days Click Here >> > http://p.sf.net/sfu/sfd2d-msazure >> > _______________________________________________ >> > gumstix-users mailing list >> > gum...@li... >> > https://lists.sourceforge.net/lists/listinfo/gumstix-users >> >> >> >> -- >> Brad Midgley >> >> -------------------------------------------------------------- >> ---------------- >> This SF email is sponsosred by: >> Try Windows Azure free for 90 days Click Here >> http://p.sf.net/sfu/sfd2d-msazure >> _______________________________________________ >> gumstix-users mailing list >> gum...@li... >> https://lists.sourceforge.net/lists/listinfo/gumstix-users >> > ------------------------------------------------------------------------------ > This SF email is sponsosred by: > Try Windows Azure free for 90 days Click Here > http://p.sf.net/sfu/sfd2d-msazure > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users |