From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mike Frysinger Date: Tue, 28 Apr 2009 11:53:18 -0400 Subject: [U-Boot] U-Boot Timer Qualification In-Reply-To: <20090428134107.0E42083420E8@gemini.denx.de> References: <20090422204936.GB29252@game.jcrosoft.org> <200904280848.14109.vapier@gentoo.org> <20090428134107.0E42083420E8@gemini.denx.de> Message-ID: <200904281153.19559.vapier@gentoo.org> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de 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 -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/pgp-signature Size: 836 bytes Desc: This is a digitally signed message part. Url : http://lists.denx.de/pipermail/u-boot/attachments/20090428/d4adaa26/attachment.pgp