Optimizing Systems to Use Flash Memory as a Hard Drive Replacement

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LEARN ABOUT NETBSD

flash

FLASH(9)						   BSD Kernel Developer's Manual						  FLASH(9)

NAME

     flash -- subsystem for flash-like memory devices

SYNOPSIS

     #include <dev/flash/flash.h>

     device_t
     flash_attach_mi(const struct flash_interface *fl, device_t dev);

DESCRIPTION

     Flash-like devices can register themselves to the flash layer with the flash_hw_if structure.  This structure has function pointers and other
     fields.

     The attachment can be done by calling flash_attach_mi() with this structure and the device's device_t as an argument.  Return value is the
     flash layer device.  The flash_interface structure is shown below.

     struct flash_interface {
	     int (*erase) (device_t, struct flash_erase_instruction *);
	     int (*read) (device_t, off_t, size_t, size_t *, uint8_t *);
	     int (*write) (device_t, off_t, size_t, size_t *, const uint8_t *);
	     int (*block_markbad)(device_t, uint64_t);
	     int (*block_isbad)(device_t, uint64_t);
	     int (*sync) (device_t);

	     int (*submit)(device_t, struct buf *);

	     /* storage for partition info */
	     struct flash_partition partition;

	     /* total size of mtd */
	     flash_addr_t size;
	     uint32_t page_size;
	     uint32_t erasesize;
	     uint32_t writesize;
	     uint32_t minor;
	     uint8_t type;
     };

SEE ALSO

     flash(4), nand(9)

AUTHORS

     Adam Hoka <ahoka@NetBSD.org>

BSD
								  March 31, 2011							       BSD

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