Fix to optiboot infinite loop problem.

Explicitly setting R1 to 0 so that the watchdog timer is properly initializing, preventing it from timing out and resetting the processor.

http://code.google.com/p/optiboot/issues/detail?id=26
http://code.google.com/p/arduino/issues/detail?id=446

Author: damellis

bootloaders/optiboot/optiboot.c

@@ -213,7 +213,7 @@ int main(void) {
   // If not, uncomment the following instructions:
   // cli();
   // SP=RAMEND;  // This is done by hardware reset
-  // asm volatile ("clr __zero_reg__");
+  asm volatile ("clr __zero_reg__");
 
   uint8_t ch;
 

bootloaders/optiboot/optiboot_atmega328.hex

@@ -1,33 +1,33 @@
-:107E000085E08093810082E08093C00088E18093C8
-:107E1000C10086E08093C20080E18093C40084B7F3
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-:107F50000102E09300023197E4918E2F19D08091B5
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-:0C7FE000DFDF1150E9F7F4DF1F91089576
+:107E0000112485E08093810082E08093C00088E1A6
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+:107F7000853739F42ED08EE10CD085E90AD08FE018
+:107F800096CF813511F488E019D023D080E101D05B
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 :0400000300007E007B
 :00000001FF