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From: "Andrey V. Elsukov" <ae@FreeBSD.org>
Date: Fri, 21 Mar 2014 09:29:01 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r263468 - head/sys/boot/common
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Author: ae
Date: Fri Mar 21 09:29:01 2014
New Revision: 263468
URL: http://svnweb.freebsd.org/changeset/base/263468

Log:
  When loader(8) inspects MBR, it chooses GPT as main partition table,
  when MBR contains only PMBR entry or it is bootcamp-compatible.
  If MBR has PMBR entry and some other, the loader rejects it.
  
  Make these checks to be less strict. If loader decided that PMBR
  isn't suitable for GPT, it will use MBR.
  
  Reported by:	Paul Thornton
  Tested by:	Paul Thornton
  MFC after:	1 week

Modified:
  head/sys/boot/common/part.c

Modified: head/sys/boot/common/part.c
==============================================================================
--- head/sys/boot/common/part.c	Fri Mar 21 05:37:25 2014	(r263467)
+++ head/sys/boot/common/part.c	Fri Mar 21 09:29:01 2014	(r263468)
@@ -634,7 +634,7 @@ ptable_open(void *dev, off_t sectors, ui
 	for (i = 0, count = 0; i < NDOSPART; i++) {
 		if (dp[i].dp_flag != 0 && dp[i].dp_flag != 0x80) {
 			DEBUG("invalid partition flag %x", dp[i].dp_flag);
-			break;
+			goto out;
 		}
 #ifdef LOADER_GPT_SUPPORT
 		if (dp[i].dp_typ == DOSPTYP_PMBR) {
@@ -646,15 +646,12 @@ ptable_open(void *dev, off_t sectors, ui
 			count++;
 	}
 	/* Do we have some invalid values? */
-	if (i != NDOSPART ||
-	    (table->type == PTABLE_GPT && count > 1)) {
+	if (table->type == PTABLE_GPT && count > 1) {
 		if (dp[1].dp_typ != DOSPTYP_HFS) {
 			table->type = PTABLE_NONE;
-			DEBUG("invalid values detected, ignore "
-			    "partition table");
-			goto out;
-		}
-		DEBUG("Bootcamp detected");
+			DEBUG("Incorrect PMBR, ignore it");
+		} else
+			DEBUG("Bootcamp detected");
 	}
 #ifdef LOADER_GPT_SUPPORT
 	if (table->type == PTABLE_GPT) {