Re: [PATCH] OMAP_LDP: Support LCD display as a FB device on ZOOM MDK (Re: LDP support)

[Kevin Hilman <khilman@deeprootsystems.com>]

Russell King - ARM Linux <linux@arm.linux.org.uk> writes:

> On Mon, May 18, 2009 at 06:54:56PM +0300, Kalle Valo wrote:
>> Russell King - ARM Linux <linux@arm.linux.org.uk> writes:
>> 
>> > On Fri, May 08, 2009 at 07:47:09PM +0300, Kalle Valo wrote:
>> >> "stanley.miao" <stanley.miao@windriver.com> writes:
>> >> 
>> >> >> Looks like you used the CodeSourcery 2007q3 toolchain. This had been
>> >> >> reported earlier. Switching to 2008q3 works.
>> >> >
>> >> > Yeah, Now the kernel booted. it's compiler's problem.
>> >> 
>> >> I was bitten by the same problem few weeks ago. Any chance of getting a
>> >> warning/error if using 2007q3 compiler until the problem is fixed?
>> >
>> > Is there any way of detecting the 2007q3 compiler?
>> >
>> > With normal GCC versions, you can use __GNUC__, __GNUC_MINOR__ and
>> > __GNUC_PATCHLEVEL__ to identify the three digit version number.
>> 
>> I don't know, most probably not. But Jon Hunter investigated the issue
>> and he found the issue was related to CONFIG_ARCH_WANT_FRAME_POINTERS:
>> 
>> http://www.mail-archive.com/linux-omap@vger.kernel.org/msg12403.html
>> 
>> So maybe we can fix or workaround this.
>
> Why does this change anything?  FRAME_POINTERS seems to be enabled
> anyway (and should be given the Kconfig setup we have.)

See the 'depends on' line in lib/Kconfig.debug.  The result is that
without the patch from Jon, even if you have CONFIG_FRAME_POINTERS=y
in your .config, it gets dropped if the arch doesn't set
CONFIG_ARCH_WANT_FRAME_POINTERS.

Kevin