"sub" machine types?

"sub" machine types?

[Steffen Sledz]

We have some products which differ in bootloaders (u-boot) and kernel device trees only. They use the same kernel and root filesystem.

Does OE have concepts for this? Or any suggestions to realize this without building for many machines?

Steffen

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DResearch Fahrzeugelektronik GmbH
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Tel: +49 30 515932-237 mailto:sledz@dresearch-fe.de
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Re: [oe] "sub" machine types?

[Nicolas Dechesne]

On Fri, Sep 4, 2015 at 9:35 AM, Steffen Sledz <sledz@dresearch-fe.de> wrote:
> We have some products which differ in bootloaders (u-boot) and kernel device trees only. They use the same kernel and root filesystem.
>
> Does OE have concepts for this? Or any suggestions to realize this without building for many machines?

most BSP layers use SOC_FAMILY, see [1] for this type of things, such
that you can create 'SOC' specific packages that are reused across
multiple (OE) machines. That sounds like that would help in your
situation.


[1] http://www.yoctoproject.org/docs/1.8/ref-manual/ref-manual.html#var-SOC_FAMILY

Re: [oe] "sub" machine types?

[Steffen Sledz]

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Am 04.09.2015 um 09:45 schrieb Nicolas Dechesne:
> On Fri, Sep 4, 2015 at 9:35 AM, Steffen Sledz <sledz@dresearch-fe.de> wrote:
>> We have some products which differ in bootloaders (u-boot) and kernel device trees only. They use the same kernel and root filesystem.
>> 
>> Does OE have concepts for this? Or any suggestions to realize this without building for many machines?
> 
> most BSP layers use SOC_FAMILY, see [1] for this type of things, such that you can create 'SOC' specific packages that are reused across multiple (OE) machines. That sounds like that would help in your situation.
> 
> [1] http://www.yoctoproject.org/docs/1.8/ref-manual/ref-manual.html#var-SOC_FAMILY

I'm not really sure if this is what we need. You suggest to use different MACHINEs of one SOC_FAMILY, Right?

But if I bitbake the root filesystem for each MACHINE an *own* image is created. And not *one* usable for all of them.

What we wish is one image containing one kernel and device tree files for each product.

In addition a u-boot image for each product so that we can use a boot setup running different u-boot images starting the same kernel and root filesystem with different parameters (e.g. for the device trees).

- -- 
DResearch Fahrzeugelektronik GmbH
Otto-Schmirgal-Str. 3, 10319 Berlin, Germany
Tel: +49 30 515932-237 mailto:sledz@dresearch-fe.de
Fax: +49 30 515932-299
Geschäftsführer: Dr. Michael Weber, Werner Mögle;
Amtsgericht Berlin Charlottenburg; HRB 130120 B;
Ust.-IDNr. DE273952058
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Re: [oe] "sub" machine types?

[Phil Blundell]

On Sat, 2015-09-05 at 08:44 +0200, Steffen Sledz wrote:
> What we wish is one image containing one kernel and device tree files for each product.

If these devices all use the same kernel and the same rootfs then it
sounds like, as far as OE is concerned, they are the same MACHINE.  If
you need to build device trees and different bootloaders for particular
variants then you can do that easily enough with custom recipes.

p.

Re: "sub" machine types?

[Mike Looijmans]

On 04-09-15 09:35, Steffen Sledz wrote:
> We have some products which differ in bootloaders (u-boot) and kernel device trees only. They use the same kernel and root filesystem.
>
> Does OE have concepts for this? Or any suggestions to realize this without building for many machines?

The way I handled this was to make it so that all machines have the same 
MACHINE_ARCH, but MACHINE has some suffixes. This combines the kernels 
and such. Only problem with that approach is that OE will erase the 
kernel for a previous machine if you build for the next one, so you have 
to copy the resulting images to another location at the end of the build.

For your case, I think you can just use a single MACHINE. You can just 
supply multiple devicetrees, and I think the u-boot recipe recently 
learned to have multiple targets, so you can build multiple bootloaders 
for a single machine too.


-- 
Mike Looijmans

Re: "sub" machine types?

[Steffen Sledz]

On 05.09.2015 13:29, Mike Looijmans wrote:
> ... and I think the u-boot recipe recently learned to have multiple targets, so you can build multiple bootloaders for a single machine too.

That sounds great. Can someone give a pointer to some documentation or examples for that?

-- 
DResearch Fahrzeugelektronik GmbH
Otto-Schmirgal-Str. 3, 10319 Berlin, Germany
Tel: +49 30 515932-237 mailto:sledz@dresearch-fe.de
Fax: +49 30 515932-299
Geschäftsführer: Dr. Michael Weber, Werner Mögle;
Amtsgericht Berlin Charlottenburg; HRB 130120 B;
Ust.-IDNr. DE273952058

Re: "sub" machine types?

[Steffen Sledz]

On 07.09.2015 09:09, Steffen Sledz wrote:
> On 05.09.2015 13:29, Mike Looijmans wrote:
>> ... and I think the u-boot recipe recently learned to have multiple targets, so you can build multiple bootloaders for a single machine too.
> 
> That sounds great. Can someone give a pointer to some documentation or examples for that?

Is it correct to just replace the UBOOT_MACHINE item in the machine config with something like this?

UBOOT_CONFIG ??= "sub1 sub2 sub3"
UBOOT_CONFIG[sub1] = "mymachine_sub1_config"
UBOOT_CONFIG[sub2] = "mymachine_sub2_config"
UBOOT_CONFIG[sub3] = "mymachine_sub3_config"

-- 
DResearch Fahrzeugelektronik GmbH
Otto-Schmirgal-Str. 3, 10319 Berlin, Germany
Tel: +49 30 515932-237 mailto:sledz@dresearch-fe.de
Fax: +49 30 515932-299
Geschäftsführer: Dr. Michael Weber, Werner Mögle;
Amtsgericht Berlin Charlottenburg; HRB 130120 B;
Ust.-IDNr. DE273952058

Re: "sub" machine types?

[Lee Nipper]

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On Mon, Sep 7, 2015 at 7:08 AM, Steffen Sledz <sledz@dresearch-fe.de> wrote:

> On 07.09.2015 09:09, Steffen Sledz wrote:
> > On 05.09.2015 13:29, Mike Looijmans wrote:
> >> ... and I think the u-boot recipe recently learned to have multiple
> targets, so you can build multiple bootloaders for a single machine too.
> >
> > That sounds great. Can someone give a pointer to some documentation or
> examples for that?
>
> Is it correct to just replace the UBOOT_MACHINE item in the machine config
> with something like this?
>
> UBOOT_CONFIG ??= "sub1 sub2 sub3"
> UBOOT_CONFIG[sub1] = "mymachine_sub1_config"
> UBOOT_CONFIG[sub2] = "mymachine_sub2_config"
> UBOOT_CONFIG[sub3] = "mymachine_sub3_config"
>
>
Looks right.

I think you may also want to add something like:

KERNEL_DEVICETREE ??= "sub1.dtb  sub2.dtb  sub3.dtb"

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Re: "sub" machine types?

[Steffen Sledz]

On 07.09.2015 16:24, Lee Nipper wrote:
> 
> On Mon, Sep 7, 2015 at 7:08 AM, Steffen Sledz <sledz@dresearch-fe.de <mailto:sledz@dresearch-fe.de>> wrote:
> 
>     On 07.09.2015 09:09, Steffen Sledz wrote:
>     > On 05.09.2015 13:29, Mike Looijmans wrote:
>     >> ... and I think the u-boot recipe recently learned to have multiple targets, so you can build multiple bootloaders for a single machine too.
>     >
>     > That sounds great. Can someone give a pointer to some documentation or examples for that?
> 
>     Is it correct to just replace the UBOOT_MACHINE item in the machine config with something like this?
> 
>     UBOOT_CONFIG ??= "sub1 sub2 sub3"
>     UBOOT_CONFIG[sub1] = "mymachine_sub1_config"
>     UBOOT_CONFIG[sub2] = "mymachine_sub2_config"
>     UBOOT_CONFIG[sub3] = "mymachine_sub3_config"
> 
> 
> Looks right.

What about the u-boot-fw-utils? Is the recipe ready for this too?

What about the artefacts? Is there one binary usable for all u-boot images?

-- 
DResearch Fahrzeugelektronik GmbH
Otto-Schmirgal-Str. 3, 10319 Berlin, Germany
Tel: +49 30 515932-237 mailto:sledz@dresearch-fe.de
Fax: +49 30 515932-299
Geschäftsführer: Dr. Michael Weber, Werner Mögle;
Amtsgericht Berlin Charlottenburg; HRB 130120 B;
Ust.-IDNr. DE273952058