m25p —
STMicroelectronics M25P family of SPI-connected flash
  devices
The m25p driver provides support for
  STMicrolelectronics' M25P family of SPI connected NOR flash devices.
The machine-independent m25p driver was written by
  Garrett D'Amore for the Champaign-Urbana Community
  Wireless Network Project (CUWiN), and appeared in NetBSD
  4.0.
Some important bits that are vital for use as a mass storage device are still
  missing. Specifically, there is no API to erase the device, and there is no
  support for device partitioning.