From: invalid@nospicedham.lkntrgzxc.com   
      
   On Thu, 11 Apr 2019 09:39:04 +0100   
   James Harris  wrote:   
      
   > On 09/04/2019 11:31, Rod Pemberton wrote:   
   > > On Mon, 8 Apr 2019 13:10:01 +0100   
   > > James Harris  wrote:   
      
   > >   
   > > What is the purpose of mapping nothing present address regions as   
   > > uncacheable? ...   
   >   
   > Why map them as cacheable?   
      
   (in questions directly below)   
      
   > >   
   > > Is there any reason to not cache garbage data?  Anything not cached,   
   > > including garbage data, will slow down the processor, correct?   
   >   
   > It will likely never be read (or written). Accesses to it would   
   > normally be errors.   
      
   You started this thread asking how to "access addresses which have no   
   RAM".  If you're accessing many such addresses sequentially, and you   
   don't know whether the region is or isn't garbage, why would you want   
   to access them slowly because they're not cached?  You could.   
      
      
   Rod Pemberton   
   P.S. days behind on c.l.m. replies ...   
   --   
   The lesson for Boeing.  You push the nose of a plane down, and planes   
   go down.   
      
   --- SoupGate-Win32 v1.05   
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