K 10
svn:author
V 2
bz
K 8
svn:date
V 27
2019-06-01T14:39:12.931588Z
K 7
svn:log
V 333
Improve error/debug messages in sdhci.c

When starting a command also print the opcode and flags.
More consitently print flags as hex.
Use slot_printf rather than printf in one case.

MFC after:		6 weeks
Reviewed by:		marius, kibab, imp
Sponsored by:		The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D19748

END