Known bugs - Revision history

Polto at 13:44, 19 July 2010

2010-07-19T13:44:40Z

← Older revision		Revision as of 13:44, 19 July 2010
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			== elphel353-8.0.8.8.30 and earlier ==
			To set the camera in triggered mode you need to set "Program ahead" parameter to 5 instead of it's default value - 3. If not the camera freeze after the first frame.


	== elphel353.7.1.4.5 and earlier ==		== elphel353.7.1.4.5 and earlier ==
	Cache coherency problem that was revealing itself in imgsrv by (sometimes) returning empty images (actually 1x1 GIF ones) after waiting fro the new image to be acquired. For the error to happen, mmap() (used while processing "img" or "meta" command) had to be called after the kernel wrote the metadata to the circular buffer (that happens during interrupt generated when the image is completely transferred to the system memory), and the mmamp-ed metadata was used before the cached data (kernel writes to cache first for this memory segment) first was flushed out (by other unrelated cache memory usage).		Cache coherency problem that was revealing itself in imgsrv by (sometimes) returning empty images (actually 1x1 GIF ones) after waiting fro the new image to be acquired. For the error to happen, mmap() (used while processing "img" or "meta" command) had to be called after the kernel wrote the metadata to the circular buffer (that happens during interrupt generated when the image is completely transferred to the system memory), and the mmamp-ed metadata was used before the cached data (kernel writes to cache first for this memory segment) first was flushed out (by other unrelated cache memory usage).

	In rev. 7.1.4.6 the bug was fixed by explicitly flushing the used cache line.		In rev. 7.1.4.6 the bug was fixed by explicitly flushing the used cache line.
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Andrey.filippov at 02:03, 5 November 2007

2007-11-05T02:03:36Z

← Older revision		Revision as of 02:03, 5 November 2007
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	In rev. 7.1.4.6 the bug was fixed by explicitly flushing the used cache line.		In rev. 7.1.4.6 the bug was fixed by explicitly flushing the used cache line.
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Andrey.filippov at 07:25, 4 November 2007

2007-11-04T07:25:06Z

New page

== elphel353.7.1.4.5 and earlier ==
Cache coherency problem that was revealing itself in imgsrv by (sometimes) returning empty images (actually 1x1 GIF ones) after waiting fro the new image to be acquired. For the error to happen, mmap() (used while processing "img" or "meta" command) had to be called after the kernel wrote the metadata to the circular buffer (that happens during interrupt generated when the image is completely transferred to the system memory), and the mmamp-ed metadata was used before the cached data (kernel writes to cache first for this memory segment) first was flushed out (by other unrelated cache memory usage).

In rev. 7.1.4.6 the bug was fixed by explicitly flushing the used cache line.