svn commit: r192027 - head/sys/arm/at91

M. Warner Losh imp at bsdimp.com
Fri May 15 03:41:18 UTC 2009


In message: <200905122114.n4CLEag9033208 at svn.freebsd.org>
            Stanislav Sedov <stas at FreeBSD.org> writes:
: @@ -926,6 +937,7 @@ atestart_locked(struct ifnet *ifp)
:  		 * tell the hardware to xmit the packet.
:  		 */
:  		WR4(sc, ETH_TAR, segs[0].ds_addr);
: +		BARRIER(sc, ETH_TAR, 8, BUS_SPACE_BARRIER_WRITE);
:  		WR4(sc, ETH_TCR, segs[0].ds_len);

Why is a barrier needed here?

Warner


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