Author: tsoome
Date: Thu Jan 9 21:21:08 2020
New Revision: 356570
URL: https://svnweb.freebsd.org/changeset/base/356570
Log:
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:
head/stand/i386/libi386/biosdisk.c
Modified: head/stand/i386/libi386/biosdisk.c
==============================================================================
--- head/stand/i386/libi386/biosdisk.c Thu Jan 9 20:49:26 2020
(r356569)
+++ head/stand/i386/libi386/biosdisk.c Thu Jan 9 21:21:08 2020
(r356570)
@@ -396,7 +396,8 @@ 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
@@ -564,7 +565,8 @@ 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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