On Tuesday 28 April 2009 09:41:07 Wolfgang Denk wrote:
In message Mike Frysinger wrote:
i too would prefer a POST case that can be classified as a mathematically sound proof. did i miss something, or was such a case proposed ?
No.
And I think it's actually difficult to implement, as it's highly system-dependent. Testing against the RTC was mentioned - there is a plethora of different RTC being usedon different boards, some more and some less suitable for such a test. Some board don't even have a RTC (quite alot of them actually), and other systems have an internal RTC that runs from the same clock as the main CPU so you can measure anything but you cannot measure wallclock times because you don't have an independent reference clock.
Yes, being able to test sucha thing is nice, but I want to make clear that this is not a mandatory prerequisite to get any code accepted.
i proposed any RTC POST as a method of being able to somewhat validate things sanely, not as a complete or required solution. i know that RTCs are not a given in the embedded world, but they are common enough that you should hopefully have a board with one to validate *arch* changes and give you an idea that things should be working. pretty much all Blackfin boards from ADI have an RTC on it with a dedicated crystal, so it makes things easy for me. -mike