Eliminate pagebuf, and use stack-allocated buffers instead. The
pagesize of all current AVRs is at most 256 only anyway, and this is
unlikely to change with the STK500v2 protocol. The previous pagebuf
implementation suffered from some possible buffer overrun.
In stk500pp_write_page(), do always write full pages, rather than
attempting to write a partial last page which did not get written at
all. Fill the remaining bytes with 0xff.
For (paged) write operations, correctly synthesize the mode byte.
This mode byte is very different from the ISP mode byte (sigh).
In stk500pp_read_byte(), when performing read operations on paged
memory, start reading at the previous page boundary rather than the
current address.
git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk@589 81a1dc3b-b13d-400b-aceb-764788c761c2
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