[meta-freescale] Questions on adapt yocto to a custom board

[Daiane Angolini]

On Thu, Aug 6, 2015 at 12:20 PM,  <andrea at perpic.it> wrote:
> Il giorno gio, 06/08/2015 alle 16.05 +0200, Daiane Angolini ha scritto:
>> On Thu, Aug 6, 2015 at 4:52 AM,  <andrea at perpic.it> wrote:
>> > Hello everybody,
>>
>> Hi
>
> Thank you Daiane for your reply
>>
>> >
>> > It's some day that I'm surfing the net looking for the answer to my
>> > question, I don't find any useful information because it looks to me
>> > that all the solutions in in some way tricks and not clean solutions.
>> >
>> > My case:
>> > I have an IMX53 custom board that is similar to loco but I added some
>> > gpio and other function due to my application needs. (I think this
>> > situation is common for everybody that produces dedicated hardware also
>> > for other processors.)
>> >
>> > For adding complexity... All the documentation I can see on the net is
>> > related OR to LTIB OR to IMX6 that uses a different kernel version so
>> > files are in different locations or with different names.
>> >
>> > Finally my question:
>> > What is the best way for deal with a new hardware?
>>
>> Start with DDR script, go to u-boot development, go to kernel bring up.
> Yes, It's what I am planning to do.
>>
>>
>> > Adapt all the file from (u-boot / kernel) of the more similar board for
>> > adapt to my needs or create a new board?
>>
>> For u-boot case, use mainline and add your board in the latest stable
>> (or upstream it)
>>
>> For kernel, I prefer to not comment. There are several possible ways to go.
>>
>> >
>> > case 1: I think it's simples because what is already working continue to
>> > work but I expect less flexibility because if I need to have a variant
>> > of that board I need to manage two different layers depends on the board
>> > I need to compile.
>> >
>> > case 2: create a new u-boot / kernel configuration for my board.
>> > I expect more difficult at the beginning, find the right files to copy,
>> > build the new versions of the firmware etc. Also every new changes on
>> > the original board will be lost if I don't change them in my new files
>>
>> In case you have the original board, it can be used as a benchmark
>> during your bringup work.
> I have IMX53qsb and my own board.
> I can boot up the system and reach the prompt with small modifications
> to u-boot. The socket for the mmc is a bit different and levels for card
> detection are swapped. as I wrote before, I tried to keep my hardware as
> similar as possible to the qsb.
>>
>> If you don't have the original board. I'm not sure if the 2 cases are different.
>>
>>
>> > What do you usually do?
>> > What do you think are the problems with case 1 and case 2?
>> >
>> > Are you aware of any guide that I can follow for case 1 and / or case 2?
>> > I am thinking about... iomux, flexcan initialization...
>>
>> Have you read already the Porting guide for i.MX6? During the bringup,
>> i.mx53 and i.mx6 is not ~that much~ different. Read that document and
>> follow that guidelines to your board. If you don't know where to find
>> it, let me know.
> Are you referring to this one?
> https://community.freescale.com/docs/DOC-100203

This one

https://www.freescale.com/webapp/Download?colCode=L3.14.28_1.0.0_LINUX_DOCS&location=null&fpsp=1&WT_TYPE=Supporting%20Information&WT_VENDOR=FREESCALE&WT_FILE_FORMAT=gz&WT_ASSET=Documentation&fileExt=.gz&Parent_nodeId=1337637154535695831062&Parent_pageType=product

It is a bundle of several files regarding L3.14.28 GA release. One of
them is the porting guide.

Daiane
>
> If it is I read it. At the moment I'm stuck with some file that are in
> different location. For example I can't find any boards.cfg file in the
> top level directory of u-boot. (Point 1 of Porting Bootloader)
>
> find . -name board
> ./board
> ./post/board
> ./.pc/0001-change-boot-params.patch/board
>
> maybe it was renamed?
> the question that came in my head after I solve this... I created a
> imx_(myboard) in my custom layer. How I tell to bitbake that it needs to
> use my own configuration of u-boot?
>
>>
>>
>> Daiane
>> >
>> > Any input will be appreciated
>> > thank you for reading the long post
>> > best regards
>> > Andrea
>> > --
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>> > meta-freescale at yoctoproject.org
>> > https://lists.yoctoproject.org/listinfo/meta-freescale
>
> Thank you again
> Andrea
>
>