[Trac #1122] EC code, dead lock code at 0x75b9

[Zarro Boogs per Child]

#1122: EC code, dead lock code at 0x75b9
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 Reporter:  frief                       |        Owner:  David.Lin
     Type:  defect                      |       Status:  new      
 Priority:  normal                      |    Milestone:  Untriaged
Component:  embedded controller         |   Resolution:           
 Keywords:  EC watchdog brownout reset  |  
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Changes (by frief):

  * keywords:  EC watchdog brown out reset => EC watchdog brownout reset

Comment:

 > ... address 75b2 to 75b8 are to control a output signel in low to make a
 hardware reset for EC.

 thanks for shedding light on this. The output signal GPIOE7
 is connected to the label POWER_BUTTON# .
 Note, in a few schematic programs (and to my naive reading) this
 would be a strictly local label because it is not connected
 to a mark like <__> or |__> or <__|


 In the schematic diagram (EC KB3700 Rev.2b 20061204 attached
 to #477) this label is only connected to SW2 and R74 so
 hardware reset functionality would not be present there.

 Sorry for the noise if the schematic program used considers
 the label global and the reset functionality sits elsewhere.
 Please consider this part of the ticket closed then.


 As for the 0x80 0xfe (sjmp .) at 0x87a8 and other accidental
 loops that might potentially catch the program counter please
 consider using the watchdog of the KB3700 if the
 power budget permits.
 Even a very low propability to end up there might have an
 effect as the ensemble of the KB3700 in all the OLPC will
 easily execute more than 10^20 CPU cycles over their lifetime.

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Ticket URL: <http://dev.laptop.org/ticket/1122#comment:2>
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