[Buildroot] BeagleBoneBlack Updates?

[Greg Beresford]

> -----Original Message-----
> From: buildroot-bounces at busybox.net [mailto:buildroot-
> bounces at busybox.net] On Behalf Of Frank Hunleth
> Sent: 16 September 2013 02:16
> To: Thomas Petazzoni
> Cc: buildroot
> Subject: Re: [Buildroot] BeagleBoneBlack Updates?
>
> On Sat, Sep 14, 2013 at 1:33 AM, Thomas Petazzoni
> <thomas.petazzoni at free-electrons.com> wrote:
> >
> > Dear Frank Hunleth,
> >
> > On Fri, 13 Sep 2013 08:58:27 -0400, Frank Hunleth wrote:
> > > It's been a while since there's been discussion on the bbb, and I
> > > wanted to check on the current status. I've been sitting on some
> > > patches that have been working for me for the past few months. Spenser
> > > Gilliland had also posted a github reference to his patches a month or
> > > so ago. As far as I can tell, the main difference is HDMI and graphics
> > > acceleration are either working or close to working in his tree. I
> > > don't use either feature.
> > >
> > > I don't mind making a pass to clean up what I have and submit it to
> > > the list, but if work is going on with Spenser's or someone else's
> > > then I'll hold off.
> >
> > I believe Spenser might be busy with the other OpenGL work, so I think
> > you could probably take your work and his BBB work, and submit patches
> > to the list. I'd really to see the BBB be an officially supported
> > platform in Buildroot.
>
> Sounds good.
>
> I just rebased to the upstream and was pleased to see the updated
> Linaro compilers. The Beaglebone Debian work uses Linaro 4.8-2013.07,
> and I had as a todo item to try to match up compilers when I had a
> chance. Both Spenser and I were using EABI compilers (as opposed to an
> EABIhf one like Debian.)
>
> I tried making the switch to EABIhf, but found out a that init won't
> start due to not being able to load libc.so.6. I assumed that
> somewhere I just had a compiler option different so that busybox was
> being compiled with a slightly different ABI than what Linaro had done
> with their version of libc. As far as I can tell with readelf, I have
> both busybox and libc.so.6 reporting ABI 3.1.1 and listing:
>
> Attribute Section: aeabi
> File Attributes
>   Tag_CPU_name: "7-A"
>   Tag_CPU_arch: v7
>   Tag_CPU_arch_profile: Application
>   Tag_ARM_ISA_use: Yes
>   Tag_THUMB_ISA_use: Thumb-2
>   Tag_FP_arch: VFPv3
>   Tag_Advanced_SIMD_arch: NEONv1
>   Tag_ABI_PCS_wchar_t: 4
>   Tag_ABI_FP_rounding: Needed
>   Tag_ABI_FP_denormal: Needed
>   Tag_ABI_FP_exceptions: Needed
>   Tag_ABI_FP_number_model: IEEE 754
>   Tag_ABI_align_needed: 8-byte
>   Tag_ABI_align_preserved: 8-byte, except leaf SP
>   Tag_ABI_enum_size: int
>   Tag_ABI_HardFP_use: SP and DP
>   Tag_ABI_VFP_args: VFP registers
>   Tag_CPU_unaligned_access: v6
>
> Right now, I'm not sure where to look for possible other differences.
> CodeSourcery and the built-in toolchains work fine (albeit with EABI).
> I was wondering if anyone else has run into issues with EABIhf to
> might help me debug this.
>

This is because the new linaro toolchain is expecting to find libc in /lib/arm-linux-gnueabihf/ as reported in https://bugs.busybox.net/show_bug.cgi?id=6452.

There's a patch to adapt toolchain/helpers.mk to the new linaro layout in the attachment to that bug, and I can say that the patch works for me, but I don't know if it would break anything else!

Regards
Greg


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