RFC - GEOM Flashmap

[Grzegorz Bernacki]

On 05/18/12 22:38, Aleksandr Rybalko wrote:
> On Fri, 18 May 2012 19:00:31 +0200
> Grzegorz Bernacki<gjb at semihalf.com>  wrote:
>
>> Hi,
>>
>> As a part of our NAND Flash Framework project we would like to add a
>> new geom class which allows to divide NAND Flash chip into partitions.
>> Nand is divided into partitions based on data in dts file.
>>
>> The purpose of having this geom class is to separate part of nand
>> chip device which might contain some crucial data like u-boot image,
>> parameters, etc. into separate devices and use the rest of nand to
>> store user data.
>>
>> Patch can be found at:
>> http://people.freebsd.org/~gber/patches/slicer.patch
>> it contains geom flashmap code along with changes in FDT area and
>> changes in DTS file for SheevaPlug.
>>
>> Please let me know if you have any comments or objections.
>>
>> thanks,
>> grzesiek
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>
> Hi Grzegorz,
>
> Long time ago I was add to my todo list item to add FDT support to
> geom_map module. Now you have good replacement.
> (/me cut off one item from todo)
>
> Just one question:
> it is possible to not assume that parent media is NAND?
>
> +		if (g_io_getattr("NAND::device", cp,&size,&dev))
> +			break;
>
> WBW

Hi Alexandr,

It seems to be doable. It requires additional testing and additional 
review. We would like to apply this patch now. And then if necessary 
this mechanism might be changed to allow other types of devices.

thanks,
grzesiek