[Trac #1050] Need new board ID mechanism

[Zarro Boogs per Child]

#1050: Need new board ID mechanism
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 Reporter:  wmb at firmworks.com  |        Owner:  wad      
     Type:  defect             |       Status:  new      
 Priority:  normal             |    Milestone:  Untriaged
Component:  hardware           |   Resolution:           
 Keywords:                     |  
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Comment (by wmb at firmworks.com):

 It turns out that the straps on LX can be used in software mode, just like
 on the GX, but they can also be used to automatically configure the PLL.

 I have worked out a simple recipe for reading the IDE data lines.

 So let's use the IDE Data lines for the board ID.  There are 16 of them,
 more than enough.  Let's reserve 6 bits,  IDE DATA[5:0] for the board ID.

 For the first board, pull IDE DATA[5:1] up and IDE DATA[0] down.  The pins
 float high, so we should use 0 as the active state.

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Ticket URL: <http://dev.laptop.org/ticket/1050#comment:1>
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