[Buildroot] status of odroidc2's support?

[Buildroot] status of odroidc2's support?

[daggs]

Greetings,

now that gcc 4.9.x was dropped from buildroot, is it impossible to build the vendor's version of odroidc2. (uboot doesn't compile)
so the is no way to build a workable image for this board. I think there support for gcc5 was added but not for gcc6.
I've tried to add support for gcc6 but it won't boot the kernel.

unfortunately, I don't have any time to handle both vendor and mainline support. I wonder if it worthwhile to continue my support for it.
I know that soon to be mainline kernel 4.15 has hdmi support but I don't know for what extent (still trying to figure it out), one thing is sure, there will be no hw decoding support.
is there a way to restore support for the vendor's flavor? maybe and external toolchain?

Dagg.

[Buildroot] status of odroidc2's support?

[Thomas Petazzoni]

Hello,

On Mon, 4 Dec 2017 07:35:27 +0100, daggs wrote:

> now that gcc 4.9.x was dropped from buildroot,

Gcc 4.9 is not dropped from Buildroot, it's still there in the current
Git master.

> is it impossible to build the vendor's version of odroidc2. (uboot
> doesn't compile)
> so the is no way to build a workable image for this board. I think
> there support for gcc5 was added but not for gcc6. I've tried to add
> support for gcc6 but it won't boot the kernel.
> 
> unfortunately, I don't have any time to handle both vendor and
> mainline support. I wonder if it worthwhile to continue my support
> for it. I know that soon to be mainline kernel 4.15 has hdmi support
> but I don't know for what extent (still trying to figure it out), one
> thing is sure, there will be no hw decoding support. is there a way
> to restore support for the vendor's flavor? maybe and external
> toolchain?

Getting U-Boot to build with gcc 5.x should just be a matter of
backporting a U-Boot patch. Can you try applying something
like ./roseapplepi/patches/uboot/0001-compiler-.h-sync-include-linux-compiler-.h-with-Linu.patch
to your U-Boot and see if it works ?

Thanks!

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

[Buildroot] status of odroidc2's support?

[daggs]

Greetings Thomas,

> Sent: Monday, December 04, 2017 at 10:13 AM
> From: "Thomas Petazzoni" <thomas.petazzoni@free-electrons.com>
> To: daggs <daggs@gmx.com>
> Cc: buildroot at buildroot.org
> Subject: Re: [Buildroot] status of odroidc2's support?
>
> Hello,
> 
> On Mon, 4 Dec 2017 07:35:27 +0100, daggs wrote:
> 
> > now that gcc 4.9.x was dropped from buildroot,
> 
> Gcc 4.9 is not dropped from Buildroot, it's still there in the current
> Git master.
> 
> > is it impossible to build the vendor's version of odroidc2. (uboot
> > doesn't compile)
> > so the is no way to build a workable image for this board. I think
> > there support for gcc5 was added but not for gcc6. I've tried to add
> > support for gcc6 but it won't boot the kernel.
> > 
> > unfortunately, I don't have any time to handle both vendor and
> > mainline support. I wonder if it worthwhile to continue my support
> > for it. I know that soon to be mainline kernel 4.15 has hdmi support
> > but I don't know for what extent (still trying to figure it out), one
> > thing is sure, there will be no hw decoding support. is there a way
> > to restore support for the vendor's flavor? maybe and external
> > toolchain?
> 
> Getting U-Boot to build with gcc 5.x should just be a matter of
> backporting a U-Boot patch. Can you try applying something
> like ./roseapplepi/patches/uboot/0001-compiler-.h-sync-include-linux-compiler-.h-with-Linu.patch
> to your U-Boot and see if it works ?
> 
> Thanks!
> 
> Thomas
> -- 
strange, when running menuconfig, I see only gcc 6 and gcc 7 in the version selection menu. what am I missing?
I think the branch already supports gcc5

Dagg.

[Buildroot] status of odroidc2's support?

[Thomas Petazzoni]

Hello,

On Mon, 4 Dec 2017 09:27:20 +0100, daggs wrote:

> strange, when running menuconfig, I see only gcc 6 and gcc 7 in the version selection menu. what am I missing?
> I think the branch already supports gcc5

Meh, it's the recent introduction of Cortex-A35 (commit
e9960da6ec84d0fc4f3d7ef8d9db5b1e29d79358 from Yann, added in Cc) that
broke this.

Due to this commit, Cortex-A35 is now the first AArch64 core, and
therefore the one selected by default instead of Cortex-A53.

So, a defconfig that has just

BR2_aarch64=y

will now build for Cortex-A35 instead of Cortex-A53. However,
Cortex-A35 support was only added in gcc 6.x, so only gcc 6.x/7.x are
allowed.

Dagg, you can for now fix that by selecting Cortex-A53 explicitly in
your defconfig:

BR2_aarch64=y
BR2_cortex_a53=y

Yann, do you think we should add a "default BR2_cortex_a53 if
BR2_aarch64 || BR2_aarch64eb" in the choice ?

Best regards,

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

[Buildroot] status of odroidc2's support?

[Yann E. MORIN]

Thomas, daggs, All,

On 2017-12-04 11:24 +0100, Thomas Petazzoni spake thusly:
> On Mon, 4 Dec 2017 09:27:20 +0100, daggs wrote:
> > strange, when running menuconfig, I see only gcc 6 and gcc 7 in the version selection menu. what am I missing?
> > I think the branch already supports gcc5
> 
> Meh, it's the recent introduction of Cortex-A35 (commit
> e9960da6ec84d0fc4f3d7ef8d9db5b1e29d79358 from Yann, added in Cc) that
> broke this.
> 
> Due to this commit, Cortex-A35 is now the first AArch64 core, and
> therefore the one selected by default instead of Cortex-A53.
> 
> So, a defconfig that has just
> 
> BR2_aarch64=y
> 
> will now build for Cortex-A35 instead of Cortex-A53. However,
> Cortex-A35 support was only added in gcc 6.x, so only gcc 6.x/7.x are
> allowed.
> 
> Dagg, you can for now fix that by selecting Cortex-A53 explicitly in
> your defconfig:
> 
> BR2_aarch64=y
> BR2_cortex_a53=y
> 
> Yann, do you think we should add a "default BR2_cortex_a53 if
> BR2_aarch64 || BR2_aarch64eb" in the choice ?

Yes, adding a better default value makes sense.

The re-organisation was so that the list gets sorted. It is not an
endosement of a better default.

I'll send a patch.

Regards,
Yann E. MORIN.

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