Un protecting flash error

[KRISHNAN SUDHAKAR-N. <sud...@mo...>]

hi,
 
I am facing few flash file accessing problems ST Linux based systems.
 
I have modified the code in stboards.c file for creating partitions 

static struct mtd_partition onboard_partitions[3] = { 

{ 

.name = "VIP800 Boot", 

.size = 0x00500000, 

.offset = 0x00000000, 

.mask_flags = 0 /* mask_flags: MTD_WRITEABLE *//* force read-only */ 

}, 

{ 

.name = "FFS0", 

.size = 0x00100000, 

.offset = 0x00500000,

.mask_flags = 0

},

{

.name = "FFS1",

.size = MTDPART_SIZ_FULL, /* will expand to the end of the flash */

.offset = 0x00600000,

.mask_flags = 0

}

Partition looks like the following

/tmp # cat /proc/mtd 
dev:    size   erasesize  name
mtd0: 00500000 00020000 "VIP800 Boot"
mtd1: 00100000 00020000 "FFS0"
mtd2: 01a00000 00020000 "FFS1"
 
if I do a flash info its working fine
 
/ # flash_info /dev/mtd2
Device /dev/mtd2 has 0 erase regions

if i try to unlock the partion its not happeniing
 
/ # flash_unlock /dev/mtd2
Could not unlock MTD device: /dev/mtd2
/ #
 
It will be very helpful if some one give some solutions
 
Thanks and Regards,
Sudhakar,
CHS-FCS,
Ex:1385