newbie: dynamic partition creation possible

newbie: dynamic partition creation possible

[Michael Palme]

hello...
i would like to know if it is possible to create flash dynamic 
partitions (i mean other way than directly in the sources). in the howto 
ive read it is impossible, but in some sources i found 
part_type="static" -- and so i've concluded "dynamic" is also an option? 
if this is possible can somebody explain the way to do it please.

thanks in advance ... Michael Palme

-- 
-------------------------------
Dipl.-Ing. (FH)
Michael Palme
software engineer
Goepel electronic GmbH

mailto: m.palme@goepel.com
phone:  +493641689682
fax:    +493641689644
inet:   http://www.goepel.com
-------------------------------

Re: newbie: dynamic partition creation possible

[Jörn Engel]

On Mon, 19 August 2002 12:55:58 +0200, Michael Palme wrote:
> i would like to know if it is possible to create flash dynamic 
> partitions (i mean other way than directly in the sources). in the howto 
> ive read it is impossible, but in some sources i found 
> part_type="static" -- and so i've concluded "dynamic" is also an option? 
> if this is possible can somebody explain the way to do it please.

What exactly do you mean by "dynamic"?

There are two methods to create partitions:
- Use a partition table parser and create a partition table.
- Provide a mapping driver and hard-code the partition layout in the
  driver.

Do you mean partition table?

Jörn

-- 
When you close your hand, you own nothing. When you open it up, you
own the whole world.
-- Li Mu Bai in Tiger & Dragon

Re: newbie: dynamic partition creation possible

[Michael Palme]

thanks for the answer...

i am not sure about the terms, but i can explain what i need in more 
clear way: i would like to have support for writing binary images into 
the flash devices (no filesystem etc.). i need different "partitions" on 
the flash and i dont want to hardcode that --
i have seen in cmdline.c that this is possible via kernel parameters.
i'm not absolutely sure what kernel options are needed and what are 
unnecessary.

cheers ... Michael



Jörn Engel schrieb:

>On Mon, 19 August 2002 12:55:58 +0200, Michael Palme wrote:
>  
>
>>i would like to know if it is possible to create flash dynamic 
>>partitions (i mean other way than directly in the sources). in the howto 
>>ive read it is impossible, but in some sources i found 
>>part_type="static" -- and so i've concluded "dynamic" is also an option? 
>>if this is possible can somebody explain the way to do it please.
>>    
>>
>
>What exactly do you mean by "dynamic"?
>
>There are two methods to create partitions:
>- Use a partition table parser and create a partition table.
>- Provide a mapping driver and hard-code the partition layout in the
>  driver.
>
>Do you mean partition table?
>
>Jörn
>
>  
>

Re: newbie: dynamic partition creation possible

[Marius Groeger]

On Tue, 20 Aug 2002, Michael Palme wrote:

> the flash devices (no filesystem etc.). i need different "partitions" on
> the flash and i dont want to hardcode that --
> i have seen in cmdline.c that this is possible via kernel parameters.
> i'm not absolutely sure what kernel options are needed and what are
> unnecessary.

What is unclear with it? cmdline.c contains examples how to use it. Actually
it can be very simple. For instance, the following term will give you two
partitions, one with 1 MiB and another with all the rest. Both will be
read-write and will receive standard labels:

   mtdparts=my-mtd-id:1m,-

However, you may have to adapt the mapping driver to use the cmdline
partitioning. Here's how:

   int num_mtd_parts, result;
   struct mtd_partition *mtd_parts;
   struct mtd_info mtd;

   num_mtd_parts = parse_cmdline_partitions(&mtd, &mtd_parts, "my-mtd-id");
   result = add_mtd_partitions (&mtd, mtd_parts, num_mtd_parts);

As an aside: it is good (but rare) practice to use the various CONFIG_
options for partitioning features.

Regards,
Marius

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Software Engineering     Embedded and Real-Time Software    www.sysgo.de
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