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[RPi2 AMP+ Fedora] Audio device not detected

I am running Fedora-Minimal-armhfp-25-1.3 as my base image.

$ uname -a
Linux 4.10.8-200.fc25.armv7hl #1 SMP Fri Mar 31 15:28:35 UTC 2017 armv7l armv7l armv7l GNU/Linux


I believe that my firmware is current:

$ sudo rpi-firmware-update -h
= This will update U-Boot and the
= Raspberry Pi Firmware to the latest.
= Uboot: uboot-images-armv7-2016.09.01-2.fc25.noarch
= Firmware: bcm283x-firmware-20170131-1.72b44d8.fc25.armv7hl
== Complete!


I cannot seem to get the card recognized (this is an AMP+ on a Raspberry Pi 2), though I've followed the guide at
<https://support.hifiberry.com/hc/en-us/articles/205377651>
Below I have attached some information:

$ sudo lsmod | sort
bcm2835_dma 20480 0
bcm2835_rng 16384 0
bcm2835_wdt 16384 0
drm 327680 3 vc4,drm_kms_helper
drm_kms_helper 151552 2 vc4
dwc2 176128 0
fb_sys_fops 16384 1 drm_kms_helper
i2c_bcm2835 16384 0
leds_gpio 16384 0
mii 16384 2 usbnet,smsc95xx
mmc_block 28672 4
mmc_core 135168 3 sdhci,mmc_block,sdhci_iproc
Module Size Used by
pwm_bcm2835 16384 0
scsi_transport_iscsi 86016 0
sdhci 49152 2 sdhci_pltfm,sdhci_iproc
sdhci_iproc 16384 0
sdhci_pltfm 16384 1 sdhci_iproc
smsc95xx 32768 0
syscopyarea 16384 1 drm_kms_helper
sysfillrect 16384 1 drm_kms_helper
sysimgblt 16384 1 drm_kms_helper
udc_core 49152 1 dwc2
usbnet 40960 1 smsc95xx
vc4 98304 0

$ sudo dmesg | grep -Ei "rasp|hifi"
[ 0.000000] OF: fdt:Machine model: Raspberry Pi 2 Model B
[ 6.877672] raspberrypi-firmware soc:firmware: Attached to firmware from 2017-01-31 17:41


My boot config contains the AMP overlay and debug...

$ sudo mount /dev/mmcblk0p1 /tmp/mnt
$ grep -v "^#" /tmp/mnt/config.txt | sed -e "/^$/d"
[pi2]
kernel=rpi2-u-boot.bin
[pi3]
kernel=rpi3-u-boot.bin
init_uart_clock=48000000
[all]
gpu_mem=16
boot_delay=1
dtparam=audio=off
dtoverlay=hifiberry-amp
dtdebug=1


The module file is there, but contains nothing (I've not found anything worth putting in there):

$ tree /etc/mo*
/etc/modprobe.d
/etc/modules-load.d
└── hifiberry.conf
/etc/motd [error opening dir]

0 directories, 1 file
$ cat /etc/modules-load.d/hifiberry.conf


As you can see, no cards are detected:

$ sudo aplay -l
aplay: device_list:268: no soundcards found...

 

Is anyone able to assist with troubleshooting?

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