[Trac #185] Need better SPI FLASH recovery procedure

[Zarro Boogs per Child]

#185: Need better SPI FLASH recovery procedure
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 Reporter:  wmb at firmworks.com  |        Owner:  wmb at firmworks.com
     Type:  task               |       Status:  closed           
 Priority:  high               |    Milestone:  BTest-1          
Component:  linuxbios          |   Resolution:  fixed            
 Keywords:                     |  
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Comment (by dwmw2):

 Replying to [ticket:185 wmb at firmworks.com]:
 > If we needed to, we could go even faster.  The serial line speed
 limitation is not in the EC, but rather in the host PC, whose baud rate
 tops out at 115200.

 Not necessarily. Almost all PC motherboards for the last decade or so have
 had their serial ports provided as part of a SuperIO chip. In turn, almost
 all of those SuperIO chips support baud rates up to 460800 or 921600; you
 just have to ask them nicely.

 For the OLPC board, I made sure we _do_ ask nicely by turning the
 appropriate enable bit on. So the port is recognised as a NS16550 since
 it's like the ones in all the NatSemi SuperIO chips and can happily do
 921600 baud.

 See http://www.devdrv.com/shsmod/ for further information and a tool which
 should flip your device into high-speed mode if your BIOS hasn't done so
 for you.

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Ticket URL: <http://dev.laptop.org/ticket/185#comment:4>
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