Hi,
So I've got access to a board with an AT45DB011D (or more accurately a XC3S50AN FPGA with integrated SPI flash that's identical to an AT45DB011D down to the ID bytes) hooked up to an FT4232H-based programmer. I've chatted to stefanct in IRC and apparently this is unlikely to be supported by flashrom in the near future, but if at some point someone does want to add support and I still have access to this board I might be able to test it.
For anyone that isn't familiar with the AT45DB011D, it's an oddball Atmel DataFlash chip with a non-power-of-two page size (264 bytes per page) and a slightly interesting address space as a result of that. It's also available in a 256-byte page variant that has the same ID and which can only be distinguished by a bit in the status register. One of the read commands supported is mostly standard aside from some weirdness resulting from the odd page size, writing and erasing is probably less so.
Aidan
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Aidan Thornton