Hello,

I have been trying to enable the audio on my beaglebone wireless,
my main issue seems to be that the oscillator for the audio clock is off,
This is the GPIO1.27 of the processor, that activates it.

@RoberCNelson already helped by telling me that this pin is supposed to be 
off by the DTS file  
<https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/tree/arch/arm/boot/dts/am335x-boneblack.dts?h=v4.9.64#n75>

*The thing is that I want to have my HDMI audio active (because i want to 
use the I2S).*
*Would someone know how to activate this?*
- by loading some overlay
- or by adding a parameter to the kernel cmdline (tried hdmi.audio=1)

Thank you for your help in advance

PS my discussion with Robert is 
here 
https://github.com/RobertCNelson/bb.org-overlays/issues/20#issuecomment-346372802

Here are some important info about the platform status
os version
git:/opt/scripts/:[2ce750d881941c5189db9e189af90517e11c079f]
eeprom:[A335BNLTBWA51645BBWG0838]
dogtag:[BeagleBoard.org Debian Image 2017-08-31]
bootloader:[microSD-(push-button)]:[/dev/mmcblk0]:[U-Boot 
2017.09-rc2-00002-g7c9353]
bootloader:[eMMC-(default)]:[/dev/mmcblk1]:[U-Boot 
2016.11-rc3-00002-g73df7f]
kernel:[4.9.45-ti-r57]
nodejs:[v6.11.2]
uboot_overlay_options:[enable_uboot_overlays=1]
uboot_overlay_options:[uboot_overlay_pru=/lib/firmware/AM335X-PRU-UIO-00A0.dtbo]
uboot_overlay_options:[enable_uboot_cape_universal=1]
pkg:[bb-cape-overlays]:[4.4.20170728.0-0rcnee1~stretch+20170728]
pkg:[bb-wl18xx-firmware]:[1.20170829-0rcnee1~stretch+20170829]
pkg:[firmware-ti-connectivity]:[20170823-1rcnee0~stretch+20170830]

pins status
audio osc enable                  27 fast    down 7 gpio 1.27 lo >>  
clk_mcasp0 (mcasp0_pins)
P9.31 / hdmi audio clk           100 fast    down 0 asp 0 tx clk    
 mcasp@48038000 (mcasp0_pins)
P9.29 / hdmi audio fs            101 fast     up  0 asp 0 tx fs      
mcasp@48038000 (mcasp0_pins)
P9.28 / hdmi audio data          103 fast    down 2 asp 0 data 2    
 mcasp@48038000 (mcasp0_pins)
P9.25 / audio osc                107 fast rx  up  0 asp 0 tx hclk    
mcasp@48038000 (mcasp0_pins)

cape load at startup
[    2.899435] bone_capemgr bone_capemgr: Baseboard: 
'A335BNLT,BWA5,1645BBWG0838'
[    2.899728] bone_capemgr bone_capemgr: 
compatible-baseboard=ti,beaglebone-black - #slots=4
[    2.928591] bone_capemgr bone_capemgr: slot #0: No cape found
[    2.959680] bone_capemgr bone_capemgr: slot #1: No cape found
[    2.992394] bone_capemgr bone_capemgr: slot #2: No cape found
[    3.025077] bone_capemgr bone_capemgr: slot #3: No cape found
[    3.030958] bone_capemgr bone_capemgr: initialized OK.
[    7.045527] systemd[1]: Set hostname to <beaglebone>.

aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: Black [TI BeagleBone Black], device 0: davinci-mcasp.0-hdmi-hifi.0 
hdmi-hifi.0-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0

xrandr --verbose
Screen 0: minimum 800 x 480, current 800 x 480, maximum 800 x 480



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