6.8 seems to work OK on the Arm64 Pine A64+ with 1GB RAM.
Some observations:
OpenBSD sees 896MB of RAM and makes only 838MB available. When running
Debian Linux on the exact same board the available RAM *after boot* is
994MB, a difference of more than 150MB. Perhaps this can be improved by
tuning the DTB.
A contrived test of network performance, using httpd(8) to serve a
large file from an mfs ramdisk over plain http, yields about 175 mbit/s
sustained transfer speed. I was not expecting to reach even 100 mbit/s
so this was a positive surprise, even if it's nowhere near the full
gigabit that other OSes can squeeze out of this board.
========
OpenBSD 6.8 (GENERIC.MP) #828: Sun Oct 4 20:35:47 MDT 2020
dera...@arm64.openbsd.org:/usr/src/sys/arch/arm64/compile/GENERIC.MP
real mem = 940503040 (896MB)
avail mem = 879267840 (838MB)
random: good seed from bootblocks
mainbus0 at root: Pine64+
psci0 at mainbus0: PSCI 1.1, SMCCC 1.2
cpu0 at mainbus0 mpidr 0: ARM Cortex-A53 r0p4
cpu0: 32KB 64b/line 2-way L1 VIPT I-cache, 32KB 64b/line 4-way L1 D-cache
cpu0: 512KB 64b/line 16-way L2 cache
cpu1 at mainbus0 mpidr 1: ARM Cortex-A53 r0p4
cpu1: 32KB 64b/line 2-way L1 VIPT I-cache, 32KB 64b/line 4-way L1 D-cache
cpu1: 512KB 64b/line 16-way L2 cache
cpu2 at mainbus0 mpidr 2: ARM Cortex-A53 r0p4
cpu2: 32KB 64b/line 2-way L1 VIPT I-cache, 32KB 64b/line 4-way L1 D-cache
cpu2: 512KB 64b/line 16-way L2 cache
cpu3 at mainbus0 mpidr 3: ARM Cortex-A53 r0p4
cpu3: 32KB 64b/line 2-way L1 VIPT I-cache, 32KB 64b/line 4-way L1 D-cache
cpu3: 512KB 64b/line 16-way L2 cache
efi0 at mainbus0: UEFI 2.8
efi0: Das U-Boot rev 0x20200700
apm0 at mainbus0
"display-engine" at mainbus0 not configured
"osc24M_clk" at mainbus0 not configured
"osc32k_clk" at mainbus0 not configured
"internal-osc-clk" at mainbus0 not configured
simpleaudio0 at mainbus0
"spdif-out" at mainbus0 not configured
agtimer0 at mainbus0: tick rate 24000 KHz
simplebus0 at mainbus0: "soc"
sxisyscon0 at simplebus0
sxisid0 at simplebus0
sxiccmu0 at simplebus0
sxipio0 at simplebus0: 103 pins
ampintc0 at simplebus0 nirq 224, ncpu 4 ipi: 0, 1: "interrupt-controller"
sxirtc0 at simplebus0
sxiccmu1 at simplebus0
sxipio1 at simplebus0: 13 pins
sxirsb0 at simplebus0
axppmic0 at sxirsb0 addr 0x3a3: AXP803
"de2" at simplebus0 not configured
"dma-controller" at simplebus0 not configured
"lcd-controller" at simplebus0 not configured
"lcd-controller" at simplebus0 not configured
sximmc0 at simplebus0
sdmmc0 at sximmc0: 4-bit, sd high-speed, mmc high-speed, dma
"usb" at simplebus0 not configured
"phy" at simplebus0 not configured
ehci0 at simplebus0
usb0 at ehci0: USB revision 2.0
uhub0 at usb0 configuration 1 interface 0 "Generic EHCI root hub" rev
2.00/1.00 addr 1
ohci0 at simplebus0: version 1.0
ehci1 at simplebus0
usb1 at ehci1: USB revision 2.0
uhub1 at usb1 configuration 1 interface 0 "Generic EHCI root hub" rev
2.00/1.00 addr 1
ohci1 at simplebus0: version 1.0
com0 at simplebus0sxiccmu_ccu_reset: 0x0000002e
: ns16550, no working fifo
com0: console
sxitwi0 at simplebus0
iic0 at sxitwi0
dwxe0 at simplebus0: address 02:ba:06:9f:01:af
rgephy0 at dwxe0 phy 1: RTL8169S/8110S/8211 PHY, rev. 5
"hdmi" at simplebus0 not configured
"hdmi-phy" at simplebus0 not configured
"interrupt-controller" at simplebus0 not configured
sxidog0 at simplebus0
gpio0 at sxipio0: 32 pins
gpio1 at sxipio0: 32 pins
gpio2 at sxipio0: 32 pins
gpio3 at sxipio0: 32 pins
gpio4 at sxipio0: 32 pins
gpio5 at sxipio0: 32 pins
gpio6 at sxipio0: 32 pins
gpio7 at sxipio0: 32 pins
gpio8 at sxipio1: 32 pins
usb2 at ohci0: USB revision 1.0
uhub2 at usb2 configuration 1 interface 0 "Generic OHCI root hub" rev
1.00/1.00 addr 1
usb3 at ohci1: USB revision 1.0
uhub3 at usb3 configuration 1 interface 0 "Generic OHCI root hub" rev
1.00/1.00 addr 1
"hdmi-connector" at mainbus0 not configured
"binman" at mainbus0 not configured
scsibus0 at sdmmc0: 2 targets, initiator 0
sd0 at scsibus0 targ 1 lun 0: <SD/MMC, 00000, 0000> removable
sd0: 7620MB, 512 bytes/sector, 15605760 sectors
vscsi0 at root
scsibus1 at vscsi0: 256 targets
softraid0 at root
scsibus2 at softraid0: 256 targets
bootfile: sd0a:/bsd
boot device: sd0
root on sd0a (e07784d42ee158ca.a) swap on sd0b dump on sd0b
========
