[meta-ti] [oe] ti81xx-psp-linux-2.6.37: broken kernel with gcc > 4.5

Thilo Fromm fromm at dresearch-fe.de
Fri May 18 06:39:41 PDT 2012

Hello Koen,

>>>> sorry for the cross-post (openembedded-devel, meta-ti), I think this
>>>> affects both projects one way or the other.
>>>> Recently, meta-openembedded/toolchain-layer removed gcc-4.5. This means
>>>> with oe-core + meta-oe you now can choose between gcc-4.6 and gcc-4.7.
>>>> However, both compilers break the kernel we're using
>>>> (ti81xx-psp-linux-2.6.37).
>>> What happens when you disable the mailbox? AIUI you shouldn't need that on
>>> Ne/Ce.
>> How do I disable the mailbox?
> In the .config

Wait wait wait, according to drivers/staging/tidspbridge/Kconfig we
need OMAP_MBOX_FWK (i.e. "the mailbox") in order to use the DSP
bridge. Disabling it would mean cutting off our DSP. No way.

>> What do you mean by Ne/Ce?
> Netra/Centaurus, dm81xx, c6a81xx, am38xx, am39xx or whatever TI is calling it nowadays.

We're on a "TI DaVinci DM8148", featuring a cortex-a8 combined with a
C674x DSP. I think the only ones left without DSPs are AM-...
processors. So no, the DSP bridge (and therefore mailboxing) must


Dipl.-Ing (FH) Thilo Fromm, MSc., Embedded Systems Architect
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