RPI3 - clang 3.9.0 issues

[Shawn Webb]

On Mon, Oct 17, 2016 at 05:18:42PM -0400, Ed Maste wrote:
> On 17 October 2016 at 17:11, Shawn Webb <shawn.webb at hardenedbsd.org> wrote:
> >
> > When the kernel is compiled with clang 3.9.0, it seems to freeze after
> > being loaded by the clang 3.8 boot1.efi/loader.efi. I'm unsure if it's
> > actually frozen or if simply nothing is being outputted to the console.
> > Either way, I don't see console messages and the RPI3 _appears_ frozen.
> 
> This will probably be a bit tricky to track down. Have you tried
> booting a Clang 3.8-compiled kernel with a Clang 3.9 boot1.efi and
> loader.efi? Do you get any kernel output, or nothing after the last
> lines of loader output?

I haven't. clang 3.9 boot1.efi won't run in the slightest. It crashes
prior to me being able to even use printf.

I could try a 3.9 loader.efi with some extra printf debugging, though.

A clang 3.8 kernel works perfectly when matched with a clang 3.8
boot1.efi and loader.efi. The clang 3.9 kernel doesn't output a single
thing. I could probably try some printf based debugging early in the
process. But it's clear that loader.efi loads the kernel and tries to
execute it.

Thanks,

-- 
Shawn Webb
Cofounder and Security Engineer
HardenedBSD

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