port-evbarm/52073: Attempting to write to onboard eMMC of BeagleBone Black results in errors

[venture37%geeklan.co.uk@localhost]

>Number:         52073
>Category:       port-evbarm
>Synopsis:       Attempting to write to onboard eMMC of BeagleBone Black results in errors
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    port-evbarm-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Mar 14 21:00:00 +0000 2017
>Originator:     Sevan Janiyan
>Release:        NetBSD-Head
>Organization:
>Environment:
NetBSD 7.99.65 (BEAGLEBONE) #1: Tue Mar 14 13:55:23 GMT 2017 src/sys/arch/evbarm/compile/obj/BEAGLEBONE evbarm
>Description:
Rev A5C board with 2GB eMMC onboard
dmesg: http://dmesgd.nycbug.org/index.cgi?do=view&id=3112

ld1 at sdmmc1: <0xfe:0x014e:MMC02G:0x00:0x26ca609b:0x000>
ld1: 1832 MB, 930 cyl, 64 head, 63 sec, 512 bytes/sect x 3751936 sectors

     Status: Command failed
    Command: /sbin/newfs -V2 -O 1 -b 16384 -f 2048 /dev/rld1a
     Hit enter to continue
--------------------------------------------------------------------------------
/dev/rld1a: 1738.4MB (3560256 sectors) block size 16384, fragment size 2048
        using 10 cylinder groups of 173.84MB, 11126 blks, 22016 inodes.
...............................................................................
ld1a: error writing fsbn 5632 of 5632-5635 (ld1 bn 64222; cn 15 tn 59 sn 25), retrying
ld1a: error writing fsbn 5632 of 5632-5635 (ld1 bn 64222; cn 15 tn 59 sn 25), retrying
ld1a: error writing fsbn 5632 of 5632-5635 (ld1 bn 64222; cn 15 tn 59 sn 25), retrying
ld1a: error writing fsbn 5632 of 5632-5635 (ld1 bn 64222; cn 15 tn 59 sn 25), retrying
ld1a: error writing fsbn 5632 of 5632-5635 (ld1 bn 64222; cn 15 tn 59 sn 25), retrying
ld1a: error writing fsbn 5632 of 5632-5635 (ld1 bn 64222; cn 15 tn 59 sn 25)
wtfs: write error for sector 5632: Connection timed out
>How-To-Repeat:
Attempt to install NetBSD onto onboard eMMC using sysinst, it will fail during newfs
>Fix: