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Per Westermark
04/10/12 12:54
Read: 726 times
Sweden


 
#187097 - Wrong hw selected, or just big lack of platform knowledge?
Responding to: Erik Malund's previous message
Erik Malund said:
a company I know of had a project delayed 6 months by deciding to use the embedded Linux OS

Erik

There aren't really any embedded Linux OS, unless you are talking about the porting of Linux to platforms without memory management unit - a stupidity in itself since the unix process model is designed all around the support for a MMU and for protection of the memory spaces of the individual processes.

But there exists a number of packaged systems where Linux is run together with a lighter set of system applications - normally BusyBox - to save on RAM and flash space. But these installations are basically running the real Linux kernel - it's just that you don't turn on more features than you need when you build the kernel. And it's normally built for a different architecture than the PC. Often ARM or PPC.

In the end, Linux really isn't an OS. But it is a central component that is packaged with lots of other tools to form an OS.

When talking about Linux in embedded environments, it's obviously important that the developers do know unix and knows how to write unix applications.

Next thing is that if they don't have experience with low-level programming, device-driver development etc, then they should not put together their own kit but should look into the reference software that the processor manufacturer - often together with some company specializing in embedded systems development - puts together. That would mean that there exists a reference hardware platform and a Linux kernel with working drivers for the processor-supported hardware. Next is that if a company do add own, additional, hardware, they must (doesn't matter what OS they use) know how to take the existing driver for that hardware and create the specific maps in the source code to how the external hardware is connected.

Do you happen to know any specifics what went wrong? We all know that embedded development is not the same as PC-class software development. Same with Linux - you do need platform skills if you do work with a specific platform - or you need to invest the time to get these skills. Getting the skills after a platform is selected will result in project delays.

I have been in situations where a chip manufacturer claims their processor supports USB or have a specific performance, but in the end have a broken hw design. In that case, there will be big issues whatever OS that is selected.

The biggest issue with Linux is that lots of people assume that just because 13-year-olds writes very advanced software for Linux machines, a professional programmer will automagically be able to work efficiently with a Linux platform. Thinking that knowledge about .NET programming is enough is like thinking C64 programming skills is enough to start working with the 3D engine of a modern computer game.

List of 92 messages in thread
TopicAuthorDate
has linux had its chips?      Jez Smith      04/06/12 05:09      
   some weirdo in sandals a ponytail        Andy Neil      04/06/12 05:38      
      Problem is      Jez Smith      04/06/12 06:16      
      possibly, but not only      Erik Malund      04/06/12 08:11      
      It's all in the history ... and "read the code" doesn't work      Richard Erlacher      04/06/12 16:39      
         Good points!      Andy Neil      04/07/12 14:48      
            Why not a firm objective?      Richard Erlacher      04/08/12 00:32      
               Lots of projects have a large percentage research        Per Westermark      04/08/12 14:58      
                  I knew you'd have to come in with something irrelevant      Richard Erlacher      04/08/12 19:29      
                     Try document an invention before it's invented...      Per Westermark      04/08/12 20:16      
                        Here's some research for you, Per      Richard Erlacher      04/09/12 13:03      
                           Richard to give an example      Erik Malund      04/09/12 13:16      
                              I'd like YOU, Erik, to come up with one example ...      Richard Erlacher      04/09/12 13:42      
                                 Always prejudice from Richard      Per Westermark      04/09/12 23:14      
                                 'documenting' means many things      Jim Granville      04/10/12 01:11      
                                 here we go again      Erik Malund      04/10/12 08:00      
                                    when you're wrong, you're wrong      Richard Erlacher      04/12/12 10:52      
                                       I do not have a microscope and probes that small      Erik Malund      04/12/12 12:30      
                                          So you've made no observations ... you just guessed ...      Richard Erlacher      04/15/12 02:22      
                                             and that irks you immensely      Erik Malund      04/15/12 06:33      
                                                What did you do, aside from guessing?      Richard Erlacher      04/15/12 09:04      
                                                   then please, tell me      Erik Malund      04/15/12 15:45      
                                                      Are you willing to explore this in detail?      Richard Erlacher      04/16/12 09:07      
                                                         now you are jumping      Erik Malund      04/16/12 09:38      
                           Your references aren't exactly backing your view      Per Westermark      04/09/12 23:39      
                              It's not about me ... it's about process      Richard Erlacher      04/10/12 00:08      
                                 But processes contains feedback loops      Per Westermark      04/10/12 00:56      
                                    I believe you've gone off-the-rails, Per      Richard Erlacher      04/12/12 11:04      
                                       But getty isn't Linux      Per Westermark      04/12/12 11:28      
                                          it's a small piece, but it's an example      Richard Erlacher      04/15/12 02:10      
                                             But not of Linux      Per Westermark      04/15/12 07:08      
                                                It was part of the distribution.      Richard Erlacher      04/15/12 09:06      
                                 'Research' can mean many things      Jim Granville      04/10/12 01:00      
                                    Yes, but that's in a different context      Richard Erlacher      04/12/12 11:11      
                                       You still haven't told what Linux documentation you miss      Per Westermark      04/12/12 11:44      
                                          I don't know what you mean      Richard Erlacher      04/15/12 02:28      
                                             Still claims based on assumptions and not facts      Per Westermark      04/15/12 07:19      
                                                Not everyone is completely stupid      Richard Erlacher      04/15/12 08:28      
                                                   But what is the relevance today?      Per Westermark      04/15/12 10:08      
                                                      I've no opinion about the current LINUX      Richard Erlacher      04/16/12 09:16      
                                                         and, you Richard, who loves living in the past      Erik Malund      04/16/12 09:40      
                                                            just a minute, Erik      Richard Erlacher      04/17/12 09:36      
                                                               Examples?      Per Westermark      04/17/12 10:42      
                                                                  Nothing has changed since 15 years ago ...      Richard Erlacher      04/17/12 23:03      
                                                                     at least not Richards opinions :)      Erik Malund      04/18/12 07:42      
                                                                     Still lots of assumptions and unbacked claims      Per Westermark      04/18/12 11:59      
                                 Oh, Richard, I have a job for you      Erik Malund      04/10/12 08:14      
                           I had Yourdons first book as manuscript and ...      Erik Malund      04/10/12 08:11      
                              be careful ...      Richard Erlacher      04/12/12 10:23      
                                 were you once a bartender ...      Erik Malund      04/12/12 10:47      
                                    You have to accept the difference ...      Richard Erlacher      04/12/12 11:14      
                                 We are careful      Per Westermark      04/12/12 11:01      
                     Hog Wash.....        Michael Karas      04/08/12 21:57      
                        Odd that you see it that way ...      Richard Erlacher      04/09/12 11:24      
                     I just documented fully      Erik Malund      04/09/12 06:43      
               Because an "Objective" is not a final product specification        Andy Neil      04/09/12 02:36      
                  I have to disagree ... the objective specification is step 1      Richard Erlacher      04/09/12 11:36      
            documentation        Andy Peters      04/09/12 11:02      
               Definitely not the "usual response"      Per Westermark      04/09/12 22:47      
   Android      Joseph Hebert      04/06/12 09:31      
      I don't think so      Jez Smith      04/06/12 12:58      
         Don't agree      Per Westermark      04/07/12 07:05      
      all due respect, no.      Andy Peters      04/09/12 11:11      
         Apple may have a price match on the superluxourious      Erik Malund      04/09/12 11:40      
            re: Apple may have a price match on the superluxourious      Andy Peters      04/11/12 18:31      
               but 95% of the population does not need....      Erik Malund      04/12/12 07:35      
                  Web browsing normally the most power-hungry you can do      Per Westermark      04/12/12 10:32      
                  re: 95%      Andy Peters      04/12/12 10:40      
               So how exactly am I wrong?      Joseph Hebert      04/12/12 08:11      
                  But Android is Linux      Per Westermark      04/12/12 10:41      
                     Just the opposite        Joseph Hebert      04/12/12 12:11      
                        {sigh}      Andy Peters      04/13/12 10:42      
                           just like the preacher said to the atheist      Erik Malund      04/13/12 11:13      
                  re: How exactly?      Andy Peters      04/12/12 11:51      
      850000 Android phones activated per day, linux video      Frieder Ferlemann      04/09/12 11:25      
   anecdotes...      Jim Granville      04/06/12 15:29      
      These guys...      Jez Smith      04/07/12 01:40      
         digital audio consoles      Andy Peters      04/09/12 11:13      
   The Rasperry Pi Foundation clearly doesn't think so!      Andy Neil      04/09/12 02:41      
      The world isn't just a few companies      Per Westermark      04/09/12 06:47      
   the basic problem with free software is...      Erik Malund      04/10/12 08:33      
      Careful with the use of "Linux". Most things "Linux" aren't!      Per Westermark      04/10/12 08:53      
         I did refer to linux itself      Erik Malund      04/10/12 09:06      
            Wrong hw selected, or just big lack of platform knowledge?      Per Westermark      04/10/12 12:54      
               a port      Erik Malund      04/10/12 13:10      
                  Always danger with low-level code for platform      Per Westermark      04/10/12 14:32      
      True - but "paid-for" is not necessarily any better!      Andy Neil      04/10/12 13:31      
         when selecting any tool      Erik Malund      04/10/12 13:44      
      As Stallman said.....      Steve M. Taylor      04/11/12 15:59      
         free      Erik Malund      04/12/12 08:11      
            All about volume or already existing knowledge/experience      Per Westermark      04/12/12 10:37      
   Well...say what you like about me, and many people do.        Jez Smith      04/11/12 14:43      

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