UM0851 datasheet(145/245 Pages) STMICROELECTRONICS

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UM0851

Non-volatile memory device drivers

Doc ID 16604 Rev 2

145/245

Figure 38.

NOR Flash software system architecture

The NOR device driver scans for the available NOR chips and if a chip is found and matches

to its list of device, the device driver configures it. After initial configuration, the information

regarding NOR Flash is exported to the MTD layer and the Flash is ready to be used by the

file-system.

NOR device driver supports various serial-NOR Flash chips. All NOR devices are listed in

"arch/arm/plat-spear/include/plat/flash_chars.h". If a new NOR device is added in the

system then its details must be entered here. Here is a code-snippet of 'flash_chars.c'.

Flash Chip Device List

------------------------

Name, Device ID code, chip shift, page shift, page size, sector size, Total size

in bytes

static struct sflash_dev sflash_ids[] = {

{

"ST M25P16", SFLASH_DEVID_M25P16,

21, 0x8, 0x100, 0x10000, 0x200000

}, {

"ST M25P32", SFLASH_DEVID_M25P32,

22, 0x8, 0x100, 0x10000, 0x400000

}, {

"ST M25P64", SFLASH_DEVID_M25P64,

23, 0x8, 0x100, 0x10000, 0x800000

}, {

"ST M25P05", SFLASH_DEVID_M25P05,

16, 0x7, 0x80, 0x8000, 0x10000

}

NOR driver

NAND driver

Linux MTD layer

YAFFS2

JFFS2

VFS

FSMC

SMI

controller

Application

User space

Kernel space

Hardware

S_NOR

Flash

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