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Re: kern/51300

The following reply was made to PR kern/51300; it has been noted by GNATS.

From: Onno van der Linden <>
Subject: Re: kern/51300
Date: Fri, 1 Jul 2016 17:44:14 +0200

 I've been using this diff for a couple of years.
 Fixes some non-detection for me most of the times.
 It seems to me it's a bug anyway: according to
 the docs I've seen there should be a delay/wait
 after setting the drive and that delay is missing
 (it's used after all the other cases of "drive setting"
  in the code).
 --- /usr/src/sys/dev/ic/wdc.c.orig	2013-09-16 17:30:49.000000000 +0200
 +++ /usr/src/sys/dev/ic/wdc.c	2014-01-25 20:33:19.000000000 +0100
 @@ -1453,6 +1453,7 @@
  	bus_space_write_1(wdr->cmd_iot, wdr->cmd_iohs[wd_sdh], 0,
  	    WDSD_IBM | (drive << 4));
 +	delay(10);
  	switch(wdcwait(chp, ata_c->r_st_bmask | WDCS_DRQ,
  	    ata_c->r_st_bmask, ata_c->timeout, wait_flags)) {
  	case WDCWAIT_OK:

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