Flash 型号和block大小查看

Flash 型号：S29AL016D90TFI001

016是flash 的大小 16M bit, D90 是指flash 的速度。

 

Get the Flash Erase Block Size.

In boot:

  EVM # flinfo

   Bank # 1: MY AMD 29LV256M (256 Mbit)

     Size: 16 MB in 256 Sectors

     Sector Start Addresses:

       02000000        02010000        02020000   (RO) 02030000   (RO) 02040000

       02050000        02060000        02070000        02080000        02090000

       . .

       02FA0000        02FB0000        02FC0000        02FD0000        02FE0000

       02FF0000

You can calculate the erase size in Bytes by either:

1.(size/sectors) * 1024 * 1024 = (16/256) * 1024 * 1024 = 65536 bytes (0x10000)

NOTE that size and sectors are obtained from the "Size:" line in the flinfo output

2.Observing the difference between two adjacent sectors. i.e.

0x2010000 - 0x2000000 = 0x10000

 

In linux:

target$ cat /proc/mtd

   dev:    size   erasesize  name

   mtd0: 00020000 00010000 "bootloader"

   mtd1: 00020000 00010000 "params"

   mtd2: 00400000 00010000 "kernel"

   mtd3: 00bc0000 00010000 "filesystem"

The above output displays the erase block size for the various partitions in the erasesize field. For this example the erase block size woulde be 0x10000.

 

开发板增加了一片 flash , 现在有两片flash 所以要修改 boot .

# vi package/devs/flash/arm/w90n740/current/src/arm_w90n740_flash.c

把    #define CYGNUM_FLASH_INTERLEAVE  (1)       －－－flash的片数

改为  #define CYGNUM_FLASH_INTERLEAVE  (2)

该文件的其它宏：

#define CYGNUM_FLASH_BASE       (0xff000000u)          －－－基地址
#define CYGNUM_FLASH_WIDTH      (16)                     －－－位宽