Hi Michael,
2011/4/26 Michael Hope <michael.h...@linaro.org>:
> Hi Barry. I think the toolchain is operating correctly here. The
> current version recognises a divide followed by a modulo and optimises
> this into a call to the standard EABI function __aeabi__uldivmod().
> Note the code:
>
> do_div(Kpart, source);
>
> K = Kpart & 0xFFFFFFFF;
>
> /* Check if we need to round */
> if ((K % 10) >= 5)
> K += 5;
>
> This function is provided by libgcc for normal applications. The
> kernel provides it's own versions in arch/arm/lib/lib1funcs.s but is
> missing __aeabi_uldivmod (note the 'l' for 64 bit).
In fact the problem happen ealier:
if (Ndiv < 6) {
source /= 2;
pll_div->pre_div = 1;
Ndiv = target / source;
} else
pll_div->pre_div = 0;
if ((Ndiv < 6) || (Ndiv > 12))
printk(KERN_WARNING
"WM8974 N value %u outwith recommended range!\n",
Ndiv);
pll_div->n = Ndiv;
Nmod = target % source;
Kpart = FIXED_PLL_SIZE * (long long)Nmod;
do_div(Kpart, source);
If commenting "source /= 2", the problem disappear.
>
> -- Michael
>
> On Tue, Apr 26, 2011 at 12:45 AM, Barry Song <21cn...@gmail.com> wrote:
>> Hi All,
>> I am using 2011.3 4.5 linaro GCC(armv7-a vfpv3d16) to compile kernel
>> and modules. I select to compile all codecs as modules:
>> "config SND_SOC_ALL_CODECS
>> tristate "Build all ASoC CODEC drivers"
>> "
>> as M and I2C/SPI too.
>>
>> Then in the kernel dir, run "make" to get both vmlinux and modules, I
>> found snd-soc-wm8974.ko, snd-soc-wm8940.ko and snd-soc-wm8510.ko will
>> fail due to "__aeabi_uldivmod undefined".
>>
>> If i comment do_div() in these codec drivers, this issue will
>> disappear. But it is strange there are many codecs which use do_div()
>> too, for example:
>> sound/soc/codecs/max98088.c
>> sound/soc/codecs/max9850.c
>> sound/soc/codecs/wm8350.c
>> sound/soc/codecs/wm8400.c
>> sound/soc/codecs/wm8510.c
>> sound/soc/codecs/wm8580.c
>> sound/soc/codecs/wm8753.c
>> sound/soc/codecs/wm8804.c
>> sound/soc/codecs/wm8900.c
>> sound/soc/codecs/wm8904.c
>> sound/soc/codecs/wm8940.c
>> sound/soc/codecs/wm8955.c
>> sound/soc/codecs/wm8960.c
>> sound/soc/codecs/wm8974.c
>> sound/soc/codecs/wm8978.c
>> sound/soc/codecs/wm8985.c
>> sound/soc/codecs/wm8990.c
>> sound/soc/codecs/wm8991.c
>> sound/soc/codecs/wm8993.c
>> sound/soc/codecs/wm8994.c
>> sound/soc/codecs/wm8995.c
>> sound/soc/codecs/wm9081.c
>>
>> but others can pass the compiling except those 3 modules. Is it due to
>> a wrong optimization by gcc?
>>
>> Other information:
>> 1. old tool-chains we are using can pass the compiling of the 3 modules.
>> 2. If i built all codecs into kernel image, these 3 drivers don't
>> report error while compiling.
>>
>> Thanks
>> Barry
>>
>> _______________________________________________
>> linaro-toolchain mailing list
>> linaro-toolchain@lists.linaro.org
>> http://lists.linaro.org/mailman/listinfo/linaro-toolchain
>>
>
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