Follow-up Comment #1, bug #43471 (project avrdude):
The problem is that this situation (Xmega but STK500v2 protocol
anyway) is uncommon. The entire code had been tailored on the
non-Xmega devices as Xmegas use their own (different) protocols.
Also, the STK500v2 itself is limited to a maximal message
size of 275 bytes, see AVR068, page 2. That used to cause
the current implementation.
I think the actual issue is that the following procedure
described in AVR068 is not implemented:
"For devices with page size bigger than what can be
transferred to STK500 in one command, several
CMD_PROGRAM_FLASH_ISP commands must be issued. In such a
case, only the last command should have the Write Page mode
bit set."
I wonder whether your bootloader would be able to handle that.
Nevertheless, changing the fixed buffers into malloc'ed
buffers might make a lot of sense. Other programmer
implementations (like those for the JTAGICEs) already do it
that way.
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