I've added it to "cmdline=" and I do see it when booted:

$ cat /proc/cmdline
console=tty0 console=ttyO0,115200n8 video=HDMI-A-1:1280x720@60 
root=/dev/mmcblk0p1 rootfstype=ext4 rootwait fixrtc coherent_pool=1M quiet 
cape_universal=enable bone_capemgr.enable_partno=BB-LCD10 
video=LVDS-1:800x600@60


On Wednesday, May 11, 2016 at 9:56:34 AM UTC-6, RobertCNelson wrote:
>
>
>
> On Wed, May 11, 2016 at 10:50 AM, Sergey Manucharian <[email protected] 
> <javascript:>> wrote:
>
>> That was the first think I tried, but it's simply ignored:
>>
>> bone_capemgr.enable_partno=XXXX
>>
>>
>>
> Well, that is the kernel parameter, so how did you pass it to the kernel 
> from u-boot?
>
> in /boot/uEnv.txt i have a some macro's setup:
>
> cape_enable=bone_capemgr.enable_partno=XXXX
>
> (our default u-boot has been patched to recognize cape_enable=)
>
> or add it to the cmdline variable:
>
> cmdline=bone_capemgr.enable_partno=XXXX
>
> Then you should see it via:
>
> cat /proc/cmdline
>
> Regards,
>
> -- 
> Robert Nelson
> https://rcn-ee.com/
>

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