The only missing OS component on the new UP Board (x5-Z8350) was that sound (HDMI) was not present..    After a bit of digging, I found some patches for Kernel 4.5, and a later patched kernel version that was supposed to work..

I tried the patched version of 4.7.0 from here:  https://github.com/plbossart/sound/tree/byt-cht-hdmi-v4.7  but found that the compile failed:

 ...............................
CC [M] sound/hdmi_audio/intel_mid_hdmi_audio_if.o
In file included from sound/hdmi_audio/intel_mid_hdmi_audio_if.c:31:0:
sound/hdmi_audio/intel_mid_hdmi_audio_if.c: In function ‘had_chk_intrmiss’:
sound/hdmi_audio/intel_mid_hdmi_audio.h:730:12: error: inlining failed in call to always_inline ‘snd_intelhad_read_len’: function body not available
 inline int snd_intelhad_read_len(struct snd_intelhad *intelhaddata);
 ^~~~~~~~~~~~~~~~~~~~~
sound/hdmi_audio/intel_mid_hdmi_audio_if.c:203:13: note: called from here
 intr_count = snd_intelhad_read_len(intelhaddata);
 ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from sound/hdmi_audio/intel_mid_hdmi_audio_if.c:31:0:
sound/hdmi_audio/intel_mid_hdmi_audio.h:738:12: error: inlining failed in call to always_inline ‘had_write_register’: function body not available
 inline int had_write_register(uint32_t reg_addr, uint32_t data);
 ^~~~~~~~~~~~~~~~~~
.................................

After more ‘research’, it seemed that this might possibly be due to the ‘later’ gcc compiler provided with Fedora 24 (6.1.1)..?     I found some older articles that referenced this particular error, and these suggested that the fix was simply to remove references to ”inline” in the affected code..    So, I modified ~/sound/hdmi_audio/intel_mid_hdmi_audio.h and removed references to ‘inline‘ from the code, and re-compiled the kernel, and it compiled OK, and when booted, sound (via HDMI) actually worked..

[rgadsdon@rgup ~]$ uname -a
Linux rgup 4.7.0-up #2 SMP Thu Aug 25 18:28:44 PDT 2016 x86_64 x86_64 x86_64 GNU/Linux
............
[rgadsdon@rgup ~]$ ll /dev/snd
total 0
drwxr-xr-x 2 root root 60 Aug 25 18:54 by-path
crw-rw----+ 1 root audio 116, 2 Aug 25 18:54 controlC0
crw-rw----+ 1 root audio 116, 3 Aug 25 19:02 pcmC0D0p
crw-rw----+ 1 root audio 116, 1 Aug 25 18:54 seq
crw-rw----+ 1 root audio 116, 33 Aug 25 18:54 timer

Not sure when this will all be incorporated in mainline kernel code, and the patches still include at least one #Fixme..

Robert Gadsdon.    August 25, 2016.