[En-Nut-Discussion] using PHAT with serial Flash

[Markus Dost]

Good morning,

I have a short question to this document: 
http://www.ethernut.de/en/documents/phat.html

"The PHAT file system does not directly access the hardware. It needs a 
block device driver attached to it, which provides the low level block 
read and write access. At the time of this writing only one block device 
driver is available, which supports Multimedia and SD Cards in SPI mode."

Does that mean that it isn't possible to mount a serial flash like the 
AT45DB with the PHAT filesystem instead of a MMC-/SD-Card?

Best regards,
Markus