[yocto] Support NAND flash

[JH]

Thanks Josef for the response and links, the board is not off the
shelf product, it was designed by a hardware contractor, so I have do
as you advised to change kernel+config and to add mtd-utils recipe.

In my previous project working on a TI ARM processor with NOR Flash,
installed with Debian armhf, I did not recall any work to interface
MTD NOR Flash, it was booted like a normal Linux distribute. For NAND,
is the Linux be able to handle read / write NAND flash as in NOR?

Thank you very much.

Kind regards,

- JH

On 6/6/19, Josef Holzmayr <holzmayr at rsi-elektrotechnik.de> wrote:
> On Thu, Jun 06, 2019 at 09:15:46PM +1000, JH wrote:
>> More specific, looks to me that the drivers are OS based, the eCos has
>> NAND I/O, the OpenWRT has some support NAND I/O as well, how does the
>> Yocto support?
>
> This is not exactly a "how does the yocto" support-thing. Yocto is not
> the OS. The OS by itself is the Linux kernel, which has extensive NAND
> support in a lot of varieties. If you want to have a look, see
> https://elixir.bootlin.com/linux/latest/source/drivers/mtd and
> especially the nand subdirectory. In a nutshell it goes like this: if
> you buy a board, ask whomever gave it to you for a kernel plus config
> that works. Also, they are in most cases also obliged to tell you how to
> write something to the (NAND-)flash.
>
> For the userspace side, there is the mtd-utils suite:
> http://www.linux-mtd.infradead.org which is already nicely packaged for
> OE:
> http://cgit.openembedded.org/openembedded-core/tree/meta/recipes-devtools/mtd/mtd-utils_git.bb
>
> So these are your starting points, you have to apply them to your
> specific setup yourself. The only common things I can think of is:
> 1) make sure your kernel+config support the flash chip in use
> 2) install the mtd-utils for interacting with it.
>
> Greetz.
>
>>
>> Thank you.
>>
>> Kind regards,
>>
>> - JH
>>
>> On 6/6/19, JH <jupiter.hce at gmail.com> wrote:
>> > Hi,
>> >
>> > Has anyone used NAND? Does the MTD already support the NAND driver or
>> > do you have to work our the detailed driver yourself? Could you share
>> > your experiences how to build the image and to hand and access the
>> > NAND if it is required?
>> >
>> > Thank you.
>> >
>> > Kind regards,
>> >
>> > - JH
>> >
>> --
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>
> --
> ———————————————
> Josef Holzmayr
> Software Developer Embedded Systems
>
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> _____________________________________________________________
> Amtsgericht Ingolstadt - GmbH: HRB 191328 - KG: HRA 170363
> Geschäftsführer: Dr.-Ing. Michael Sorg, Dipl.-Ing. Franz Sorg
> USt-IdNr.: DE 128592548
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