Date: Thu, 9 Jan 2020 21:37:51 +0000 (UTC) From: Toomas Soome <tsoome@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-12@freebsd.org Subject: svn commit: r356571 - stable/12/stand/i386/libi386 Message-ID: <202001092137.009LbptK098850@repo.freebsd.org>
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Author: tsoome Date: Thu Jan 9 21:37:50 2020 New Revision: 356571 URL: https://svnweb.freebsd.org/changeset/base/356571 Log: MFC r356570: loader: bioscd probe can get sector size 0 With buggy BIOS, it may happen we get sector size reported 0 for cd, and then the default 512 is used, which is quite wrong. PR: 238749 Modified: stable/12/stand/i386/libi386/biosdisk.c Directory Properties: stable/12/ (props changed) Modified: stable/12/stand/i386/libi386/biosdisk.c ============================================================================== --- stable/12/stand/i386/libi386/biosdisk.c Thu Jan 9 21:21:08 2020 (r356570) +++ stable/12/stand/i386/libi386/biosdisk.c Thu Jan 9 21:37:50 2020 (r356571) @@ -380,7 +380,8 @@ bc_add(int biosdev) return (-1); bd->bd_flags = BD_CDROM; - bd->bd_unit = biosdev; + bd->bd_unit = biosdev; + bd->bd_sectorsize = 2048; /* * Ignore result from bd_int13probe(), we will use local @@ -548,7 +549,8 @@ bd_int13probe(bdinfo_t *bd) bd->bd_flags |= BD_MODEEDD3; /* Default sector size */ - bd->bd_sectorsize = BIOSDISK_SECSIZE; + if (bd->bd_sectorsize == 0) + bd->bd_sectorsize = BIOSDISK_SECSIZE; /* * Test if the floppy device is present, so we can avoid receiving
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