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@@ -8,7 +8,7 @@ Optiboot occasionally generates questions on various forums (Arduino, AVRFreaks,
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1. Can I put Optiboot on my Arduino MEGA2560 ?
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- No. Optiboot uses "Version 1" of the STK500 communications protocol, which only allows up to 64kwords of flash to be programmed.
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+ No. Optiboot uses "Version 1" of the STK500 communications protocol, which only allows up to 64kwords of flash to be programmed. However, see https://github.com/Optiboot/optiboot/pull/159 for a possible workaround.
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1. Why does Optiboot have its own copy of boot.h ?
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@@ -49,3 +49,10 @@ Optiboot occasionally generates questions on various forums (Arduino, AVRFreaks,
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1. Where did 0x3e00 come from? I don't see that in the data sheet!
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There are various places where the Atmel documentation uses WORD addresses for flash memory, while most of the gnu tools use BYTE addresses. 0x3e00 comes from the "boot size configuration" in the boot loader support chapter of the datasheet (where it says "0x1F00")
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+ 1. Do I need a different version of Optiboot for the non-DIP packages like the ATmega328p-au ?
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+ No, the package should be irrelevant to the bootloader software. Watch your pin connections, connect all the (multiple) power supply pins, and the same bootloader and bootloader loading procedure should work. If it doesn't work, it is due to some factor other than Optiboot.
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Bill Westfield