Changeset 66372 in vbox for trunk/src/VBox/Devices/PC/BIOS

Timestamp:

Mar 30, 2017 7:22:45 PM (8 years ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

114317

Message:

BIOS: Corrected El Torito hard disk emulation geometry calculation.

File:

• trunk/src/VBox/Devices/PC/BIOS/eltorito.c (modified) (1 diff)

trunk/src/VBox/Devices/PC/BIOS/eltorito.c

@@ -431 +431 @@
     case 0x04:  /* Hard disk */
         cdemu->vdevice.spt       = read_byte(boot_segment,446+6)&0x3f;
-        cdemu->vdevice.cylinders = (read_byte(boot_segment,446+6)<<2) + read_byte(boot_segment,446+7) + 1;
+        cdemu->vdevice.cylinders = ((read_byte(boot_segment,446+6)&~0x3f)<<2) + read_byte(boot_segment,446+7) + 1;
         cdemu->vdevice.heads     = read_byte(boot_segment,446+5) + 1;
         break;