RE: Un protecting flash error

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

Hi Stuart,

Thanks for the reply.

This is the first time I am trying to write in this board.

But unprotect and write is possible in uboot prompt.

In the same board flash info is working.

Thanks
-----Original Message-----
From: Stuart MENEFY [mailto:stu...@st...] 
Sent: Tuesday, February 26, 2008 8:02 PM
To: KRISHNAN SUDHAKAR-NRD743
Cc: lin...@li...
Subject: Re: Un protecting flash error

Hi Sudhakar

KRISHNAN SUDHAKAR-NRD743 wrote:
> I am facing few flash file accessing problems ST Linux based systems.
> I have modified the code in stboards.c file for creating partitions
...
> 
> 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

The implication is that changing the partition table has broken this, is
this correct or has it never worked?

If its never worked I'd be suspicious that your board has a write
protect signal, VPP enable or something similar which you need to
enable.

Stuart