[U-Boot] Cannot compile arm u-boot with hardfloat toolchain

Michael Trimarchi
2015-01-05T12:08:19Z

Hi

On Mon, Jan 5, 2015 at 11:51 AM, Hans de Goede <hdegoede@redhat.com> wrote:
> Hi,
>
> On 05-01-15 11:46, B.R. Oake wrote:
>>
>> On 05/01/15 01:28, Tom Rini wrote:
>>>
>>> On Sun, Jan 04, 2015 at 11:23:29PM +0100, Michal Suchanek wrote:
>>>>
>>>> when using a hardfloat toolchain linking u-boot fails.
>>>
>>>
>>> What version of U-Boot are you building? There's a few rc releases that
>>> fail with hardfp-only because a few things leaked in with 64bit math.
>>
>>
>> Hi Tom,
>>
>> I also encountered this problem
>> ( http://lists.denx.de/pipermail/u-boot/2015-January/200123.html )
>> and found it was indeed when 64-bit maths operations were included.
>> To be exact, it was this division of a long long in
>> drivers/video/videomodes.c:
>>
>> mode->pixclock = 1000000000000LL /
>> EDID_DETAILED_TIMING_PIXEL_CLOCK(*t);
>>
>> which was part of this commit in Hans' sunxi video series:
>>
>> 0cd5efe videomodes: Add video_edid_dtd_to_ctfb_res_modes helper function
>>
>> and which was linked into the u-boot binary in a later commit:
>>
>> e7872f3 sunxi: video: Use video-mode/-timing from videomodes
>> diff --git a/drivers/video/Makefile b/drivers/video/Makefile
>> [...]
>> -obj-$(CONFIG_VIDEO_SUNXI) += sunxi_display.o
>> +obj-$(CONFIG_VIDEO_SUNXI) += sunxi_display.o videomodes.o
>
>
> Ah, ok, thanks for figuring that out, so this only happens to people
> following my sunxi-wip branch, because that commit is not upstream yet.
>
> So I guess I will need to fix this somehow without using 64 bit math,
> any suggestions?

do_div?

Michael

>
> Regards,
>
> Hans
>
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