Re: Migration from dylan to daisy (and dizzy)

[Gary Thomas <gary@mlbassoc.com>]

On 2015-04-29 12:17, Laszlo Papp wrote:
> Dear OpenEmbedded Community,
>
> I have been trying to migrate over from dylan to daisy (and dizzy,
> fwiw), but my own kernel would not boot. It used to work just fine
> with dylen. It is kernel 3.2 with our BSP changes on top of it, which
> are unfortunately not upstream. Either way, dylan was using 4.7 and I
> tried to build the kernel with gcc 4.8 from daisy and gcc 4.9 from
> dizzy.
>
> I suspect that it is a toolchain and/or kernel issue, definitely not
> Yocto as I can reproduce this with some Linaro binaries for arm
> gnueabi. Still, I hope that some may have some ideas while working in
> scenarios like this?
>

You may need a couple of patches to the Linux kernel to use GCC > 4.7.1
   From 455bd4c430b0c0a361f38e8658a0d6cb469942b5 Mon Sep 17 00:00:00 2001
   From: Ivan Djelic <ivan.djelic@parrot.com>
   Date: Wed, 6 Mar 2013 20:09:27 +0100
   Subject: [PATCH] ARM: 7668/1: fix memset-related crashes caused by recent GCC (4.7.2) optimizations

   From 418df63adac56841ef6b0f1fcf435bc64d4ed177 Mon Sep 17 00:00:00 2001
   From: Nicolas Pitre <nicolas.pitre@linaro.org>
   Date: Tue, 12 Mar 2013 13:00:42 +0100
   Subject: [PATCH] ARM: 7670/1: fix the memset fix

> Jtag with openocd and gdb shows the following backtrace, where
> foo_map_io comes from our board description. As you can see it is
> fundamentally broken as it gets stuck at the early register access,
> even before printk could be used! I tried using early_prink by
> enabling debug_ll, but it did not work out for me. Like I wrote, this
> is a really early stage of the booting process.
>
> Has anyone experienced similar issues? I would like to update our
> Yocto, but it is becoming very difficult as I do not possess the
> corresponding gcc and linux expertise, unfortunately. :(
>
> Thank you in advance!
>
>      (gdb) bt
>      #0  0xc0016f40 in davinci_psc_config ()
>      #1  0xc00164b8 in __clk_enable ()
>      #2  0xc00165cc in clk_enable ()
>      #3  0xc03aa8b0 in davinci_clk_init ()
>      #4  0xc03ab2ec in davinci_common_init ()
>      #5  0xc03ab52c in da850_init ()
>      #6  0xc03ac360 in foo_map_io ()
>      #7  0xc03aa2d4 in paging_init ()
>      #8  0xc03a8640 in setup_arch ()
>      #9  0xc03a6590 in start_kernel ()
>      #10 0xc0008040 in stext ()
>      (gdb)
>
> Ys, L.
>

-- 
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Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
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