Updated the DragonBoard 410c to patched Kernel 4.2-rc1 from https://git.linaro.org/landing-teams/working/qualcomm/kernel.git/tree/refs/heads/integration-linux-qcomlt , and the system booted OK:

Fedora release 22 (Twenty Two)
Kernel 4.2.0-rc1+ on an aarch64 (ttyMSM0)
...........
# uname -a
Linux rg410c 4.2.0-rc1+ #2 SMP PREEMPT Thu Jul 16 15:14:27 PDT 2015 aarch64 aarch64 aarch64 GNU/Linux

– But, on further testing, the SD Card (mmc1) had not been detected/connected:

# dmesg |grep mmc
.............................
[ 1.054080] mmc0: SDHCI controller on 7824900.sdhci [7824900.sdhci] using ADMA 64-bit
[ 1.114173] mmc1: SDHCI controller on 7864900.sdhci [7864900.sdhci] using ADMA 64-bit
[ 1.124414] mmc0: MAN_BKOPS_EN bit is not set
[ 1.148855] mmc0: new high speed MMC card at address 0001
[ 1.151959] mmcblk0: mmc0:0001 DS2008 7.28 GiB
[ 1.155796] mmcblk0boot0: mmc0:0001 DS2008 partition 1 4.00 MiB
[ 1.163796] mmcblk0boot1: mmc0:0001 DS2008 partition 2 4.00 MiB
[ 1.166340] mmcblk0rpmb: mmc0:0001 DS2008 partition 3 4.00 MiB
[ 1.192548] mmcblk0: p1 p2 p3 p4 p5 p6 p7 p8 p9 p10
[ 1.332180] mmc1: Reset 0x1 never completed.
[ 1.515375] mmc1: Reset 0x1 never completed.
[ 1.697062] mmc1: Reset 0x1 never completed.
[ 1.888422] mmc1: Reset 0x1 never completed.
............................

So.. Reverted to the qcom-patched 4.0 kernel, again..

This was an issue with the 4.1 patched kernel, as well..    Hopefully this will get fixed soon, now that some patches are entering the official kernel.org tree..

Robert Gadsdon.   July 16, 2015.