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loader: bioscd probe can get sector size 0

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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
This commit is contained in:
Toomas Soome 2020-01-09 21:21:08 +00:00
parent 57e642365b
commit 20698d1531
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=356570
1 changed files with 4 additions and 2 deletions
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6
stand/i386/libi386/biosdisk.c
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@ -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