After the – partial – success with the 96Boards Hikey, I tried the Qualcomm Dragonboard 410c, but the June 29 Linux-Next failed to boot successfully, with only one CPU initialising, and MMC errors, and eventual hang….

.............................
psci: failed to boot CPU1 (-95)
CPU1: failed to boot: -95
CPU1: failed in unknown state : 0x0
psci: failed to boot CPU2 (-95)
CPU2: failed to boot: -95
CPU2: failed in unknown state : 0x0
psci: failed to boot CPU3 (-95)
CPU3: failed to boot: -95
CPU3: failed in unknown state : 0x0
Brought up 1 CPUs
SMP: Total of 1 processors activated.
.................................
sdhci_msm 7864900.sdhci: Got CD GPIO
mmc0: Reset 0x1 never completed.
sdhci: =========== REGISTER DUMP (mmc0)===========
sdhci: Sys addr: 0x00000000 | Version: 0x00002e02
sdhci: Blk size: 0x00004000 | Blk cnt: 0x00000000
sdhci: Argument: 0x00000000 | Trn mode: 0x00000000
sdhci: Present: 0x01f80000 | Host ctl: 0x00000000
sdhci: Power: 0x00000000 | Blk gap: 0x00000000
sdhci: Wake-up: 0x00000000 | Clock: 0x00000003
sdhci: Timeout: 0x00000000 | Int stat: 0x00000000
sdhci: Int enab: 0x00000000 | Sig enab: 0x00000000
sdhci: AC12 err: 0x00000000 | Slot int: 0x00000000
sdhci: Caps: 0x322dc8b2 | Caps_1: 0x00008007
sdhci: Cmd: 0x00000000 | Max curr: 0x00000000
sdhci: Host ctl2: 0x00000000
sdhci: ===========================================
..............................
(repeated) - then Hang..

These 96Boards-based systems have been available for some time now, but ‘mainstream’ kernel development is very sluggish..

Robert Gadsdon.   July 1, 2016.