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Re: ARM/Atmel buses, architecture - Naimi

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On 11.6.2016 г. 22:51, George Neuner wrote:
>....
> Self-modifying code is a serious issue for deep pipelines: the old
> version of a modified instruction may already have been fetched.
 > ....

Not exactly this but in this line of thought something got me some 15
years ago when I was dealing with the 5420 in a way I still remember,
wasted me a day perhaps.
I had written some self modifying code - not for use in the end device,
just a one time utility for me. Ran it on the 5420 (was computationally
intensive and this was my fastest option at the time, then I had made
a new toolchain for it so I wanted to use it etc.).
Something pretty simple did not work; the self modifying code seemed
not to get modified or something. But when I looked with the monitor
(I had done that for the 5420, too) it was OK. Yet it ran as if it
was not.
Turned out I had not read the entire errata sheet. There was something
about writing to program memory which got never initiated unless a write
to some data memory took place after it (or something of the sort)...
So when the monitor trapped it obviously did write to data
memory - stack etc. - and I saw the correct program memory...

Still remember it, could even locate the source (just found the
comment "hopefully some write has begun....", did not try to
get into the details again of course).

Dimiter

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Dimiter Popoff, TGI             http://www.tgi-sci.com
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http://www.flickr.com/photos/didi_tgi/

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ARM/Atmel buses, architecture - Naimi "Veek. M" <vek.m1234@gmail.com> - 2016-06-10 10:59 +0530
  Re: ARM/Atmel buses, architecture - Naimi rickman <gnuarm@gmail.com> - 2016-06-10 01:44 -0400
  Re: ARM/Atmel buses, architecture - Naimi David Brown <david.brown@hesbynett.no> - 2016-06-10 09:13 +0200
    Re: ARM/Atmel buses, architecture - Naimi Tim Wescott <seemywebsite@myfooter.really> - 2016-06-10 12:22 -0500
      Re: ARM/Atmel buses, architecture - Naimi rickman <gnuarm@gmail.com> - 2016-06-10 14:05 -0400
        Re: ARM/Atmel buses, architecture - Naimi Tim Wescott <seemywebsite@myfooter.really> - 2016-06-10 14:06 -0500
        Re: ARM/Atmel buses, architecture - Naimi David Brown <david.brown@hesbynett.no> - 2016-06-11 02:00 +0200
      Re: ARM/Atmel buses, architecture - Naimi George Neuner <gneuner2@comcast.net> - 2016-06-10 21:07 -0400
        Re: ARM/Atmel buses, architecture - Naimi rickman <gnuarm@gmail.com> - 2016-06-10 22:35 -0400
          Re: ARM/Atmel buses, architecture - Naimi Tim Wescott <tim@seemywebsite.com> - 2016-06-10 22:14 -0500
          Re: ARM/Atmel buses, architecture - Naimi Dimiter_Popoff <dp@tgi-sci.com> - 2016-06-11 14:48 +0300
          Re: ARM/Atmel buses, architecture - Naimi George Neuner <gneuner2@comcast.net> - 2016-06-11 15:51 -0400
            Re: ARM/Atmel buses, architecture - Naimi Dimiter_Popoff <dp@tgi-sci.com> - 2016-06-12 02:13 +0300
              Re: ARM/Atmel buses, architecture - Naimi George Neuner <gneuner2@comcast.net> - 2016-06-11 22:40 -0400
                Re: ARM/Atmel buses, architecture - Naimi Dimiter_Popoff <dp@tgi-sci.com> - 2016-06-12 10:22 +0300
                Re: ARM/Atmel buses, architecture - Naimi George Neuner <gneuner2@comcast.net> - 2016-06-13 10:36 -0400
            Re: ARM/Atmel buses, architecture - Naimi Clifford Heath <no.spam@please.net> - 2016-06-12 11:01 +1000
              Re: ARM/Atmel buses, architecture - Naimi George Neuner <gneuner2@comcast.net> - 2016-06-11 23:50 -0400
              Re: ARM/Atmel buses, architecture - Naimi upsidedown@downunder.com - 2016-06-12 10:13 +0300

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