Bjoern A. Zeeb 8adf420203 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
2019-06-01 14:39:12 +00:00
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