Changeset 35107 in vbox

Timestamp:

Dec 14, 2010 5:15:17 PM (14 years ago)

Author:

vboxsync

Message:

BIOS: Fix for multi-sector transfers of exactly 64K.

File:

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

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

@@ -2865 +2865 @@
   mode    = read_byte(ebda_seg, &EbdaData->ata.devices[device].mode);
   blksize = read_word(ebda_seg, &EbdaData->ata.devices[device].blksize);
-  if (mode == ATA_MODE_PIO32) blksize>>=2;
-  else blksize>>=1;
+  if (blksize == 0) {   /* If transfer size is exactly 64K */
+      if (mode == ATA_MODE_PIO32) blksize=0x4000;
+      else blksize=0x8000;
+  } else {
+    if (mode == ATA_MODE_PIO32) blksize>>=2;
+    else blksize>>=1;
+  }
 
 #ifdef VBOX