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

Mon Aug 10 05:56:13 PDT 2015

Hello Daiane,

I'm sorry but maybe I expressed myself in a wrong way.
My "it's the right one?" was intended as "I don't have the boards.conf"
so I had the feeling that I was compiling a package that is not the one
you was referring in the guide.
I'll try to understand how it works with new versions of u-boot as
pointed out by Fabio.

Il giorno lun, 10/08/2015 alle 14.19 +0200, Daiane Angolini ha scritto:
> On Fri, Aug 7, 2015 at 4:24 AM,  <andrea at perpic.it> wrote:
> > Hello Daiane,
> >
> > Thank you I got the file.
> > As per the other guide there is a reference to <UBOOT_DIR>/boards.cfg
> > that file is not present in my u-boot dir.
> > if I do bitbake -c devshell virtual/bootloader I get:
> > tmp/work/av_imx-poky-linux-gnueabi/u-boot-fslc/v2014.10+gitAUTOINC
> > +5fd0b607d0-r0/git
> >
> > I see that I was using u-boot-fslc and not a u-boot-imx as stated in the
> > guide. Adding
> > PREFERRED_PROVIDER_virtual/bootloader = "u-boot-imx" in local.conf
> > changed the bootloader to u-boot. there's no reference to imx in the
> > path
> > tmp/work/av_imx-poky-linux-gnueabi/u-boot/v2013.07+gitAUTOINC
> > +62c175fbb8-r0/git
> > but I have a boards.cfg
> >
> > What is the difference from the two bootloader versions? Why should I
> > choose one instead of the other? And... It's the right one? as written
> > in the guide?
> 
> In my point of view, any new u-boot work should be done using mainline
> as base (latest stable).
> 
> I understand the temptation to separate the world between right and
> wrong, but we all know it's a gray world, not a black and white world.
It's not a temptation to do it. Probably I wrote it with the wrong
characters. I was just trying to follow the guide you posted.
> 
> Take a look in [1] to understand what our community is, and in [2] to
> see the list of all u-boot forks provided by FSL Community BSP.
> 
> [1] http://freescale.github.io/doc/release-notes/1.8/
> [2] http://freescale.github.io/doc/release-notes/1.8/index.html#bootloaders
Perfect. Understood the difference. Thank you.
> 
> I'm really trying to not be unkind (which is really difficult in plain
> text only), but the definition of what is the right base of work for
> your very one project is something you must answer.
> 
> What do you think is the best u-boot to base your work on?
> 
> Daiane
> 
> >
> > thank you
> > Andrea
> >
> >
> > Il giorno gio, 06/08/2015 alle 18.01 +0200, Daiane Angolini ha scritto:
> >> 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
> >> >> > --
> >> >> > _______________________________________________
> >> >> > meta-freescale mailing list
> >> >> > meta-freescale at yoctoproject.org
> >> >> > https://lists.yoctoproject.org/listinfo/meta-freescale
> >> >
> >> > Thank you again
> >> > Andrea
> >> >
> >> >
> >

Thank you
Andrea