Mounting Entire Flash

Mounting Entire Flash

[Rahanesh]

Hi All,

Currently I have 4 mtd partitions in Flash. They are all seen under /dev 
directory as mtd0 mtd1 mtd2 and mtd3.

mtd0-> Uboot + Itz Environment
mtd1-> JFFS
mtd2-> Config files
mtd3-> Not used

I am currently trying to implement Image upgradation.

I will need to update JFFS, uboot and Config files from Linux.

I am currently achieving this through  flash_eraseall and dd  command .

To Update U-boot First i will do a

flash_eraseall /dev/mtd0 and then
dd if=uboot.bin of=/dev/mtd0 count=size;

and similarly for all individual partitions.

But If i have a combined image as combined.bin  how do i update the 
entire flash .

Is it possible to see entire flash as /dev/mtd  . i can very well 
extract individual images from combined image and reflash to respective 
partitions.

But it would be generic if  we are able write to entire flash not to 
individual partitions.

Is it possible to Write to entire flash as such.

Thanks
Rahanesh
 

Re: Mounting Entire Flash

[Dennis McLeod]

On Thu, 2009-09-24 at 15:44 +0530, Rahanesh wrote:
> Hi All,
> 
> Currently I have 4 mtd partitions in Flash. They are all seen under /dev 
> directory as mtd0 mtd1 mtd2 and mtd3.
> 
> mtd0-> Uboot + Itz Environment
> mtd1-> JFFS
> mtd2-> Config files
> mtd3-> Not used
> 
> I am currently trying to implement Image upgradation.
> 
> I will need to update JFFS, uboot and Config files from Linux.
> 
> I am currently achieving this through  flash_eraseall and dd  command .
> 
> To Update U-boot First i will do a
> 
> flash_eraseall /dev/mtd0 and then
> dd if=uboot.bin of=/dev/mtd0 count=size;
> 
> and similarly for all individual partitions.
> 
> But If i have a combined image as combined.bin  how do i update the 
> entire flash .
> 
> Is it possible to see entire flash as /dev/mtd  . i can very well 
> extract individual images from combined image and reflash to respective 
> partitions.
> 
> But it would be generic if  we are able write to entire flash not to 
> individual partitions.
> 
> Is it possible to Write to entire flash as such.
> 
> Thanks
> Rahanesh

I always set up a partition that spans the entire flash chip.. 

mtd0 -> 0:ENTIRE_SIZE
mtd1 -> 0:+10M
mtd2 -> 10M:22M
...



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Re: Mounting Entire Flash

[Rahanesh]

Hi Dennis,

> On Thu, 2009-09-24 at 15:44 +0530, Rahanesh wrote:
>   
>> Hi All,
>>
>> Currently I have 4 mtd partitions in Flash. They are all seen under /dev 
>> directory as mtd0 mtd1 mtd2 and mtd3.
>>
>> mtd0-> Uboot + Itz Environment
>> mtd1-> JFFS
>> mtd2-> Config files
>> mtd3-> Not used
>>
>> I am currently trying to implement Image upgradation.
>>
>> I will need to update JFFS, uboot and Config files from Linux.
>>
>> I am currently achieving this through  flash_eraseall and dd  command .
>>
>> To Update U-boot First i will do a
>>
>> flash_eraseall /dev/mtd0 and then
>> dd if=uboot.bin of=/dev/mtd0 count=size;
>>
>> and similarly for all individual partitions.
>>
>> But If i have a combined image as combined.bin  how do i update the 
>> entire flash .
>>
>> Is it possible to see entire flash as /dev/mtd  . i can very well 
>> extract individual images from combined image and reflash to respective 
>> partitions.
>>
>> But it would be generic if  we are able write to entire flash not to 
>> individual partitions.
>>
>> Is it possible to Write to entire flash as such.
>>
>> Thanks
>> Rahanesh
>>     
>
> I always set up a partition that spans the entire flash chip.. 
>
> mtd0 -> 0:ENTIRE_SIZE
> mtd1 -> 0:+10M
> mtd2 -> 10M:22M
>   
         How do we achieve this? Should we edit /proc/mtd or 
flash/driver code ?

        Thanks
        Rahanesh

Re: Mounting Entire Flash

[zheng shi]

There's a kernel command line parameter called mtdparts.
You may refer to the comments in drivers/mtd/cmdlinepart.c.

On Tue, Sep 29, 2009 at 1:00 PM, Rahanesh <rahanesh@tataelxsi.co.in> wrote:
> Hi Dennis,
>
>> On Thu, 2009-09-24 at 15:44 +0530, Rahanesh wrote:
>>
>>>
>>> Hi All,
>>>
>>> Currently I have 4 mtd partitions in Flash. They are all seen under /dev
>>> directory as mtd0 mtd1 mtd2 and mtd3.
>>>
>>> mtd0-> Uboot + Itz Environment
>>> mtd1-> JFFS
>>> mtd2-> Config files
>>> mtd3-> Not used
>>>
>>> I am currently trying to implement Image upgradation.
>>>
>>> I will need to update JFFS, uboot and Config files from Linux.
>>>
>>> I am currently achieving this through  flash_eraseall and dd  command .
>>>
>>> To Update U-boot First i will do a
>>>
>>> flash_eraseall /dev/mtd0 and then
>>> dd if=uboot.bin of=/dev/mtd0 count=size;
>>>
>>> and similarly for all individual partitions.
>>>
>>> But If i have a combined image as combined.bin  how do i update the
>>> entire flash .
>>>
>>> Is it possible to see entire flash as /dev/mtd  . i can very well extract
>>> individual images from combined image and reflash to respective partitions.
>>>
>>> But it would be generic if  we are able write to entire flash not to
>>> individual partitions.
>>>
>>> Is it possible to Write to entire flash as such.
>>>
>>> Thanks
>>> Rahanesh
>>>
>>
>> I always set up a partition that spans the entire flash chip..
>> mtd0 -> 0:ENTIRE_SIZE
>> mtd1 -> 0:+10M
>> mtd2 -> 10M:22M
>>
>
>        How do we achieve this? Should we edit /proc/mtd or flash/driver code
> ?
>
>       Thanks
>       Rahanesh
>
>
>
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>



-- 
Regards, Shizheng