Changeset 549 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/CreateDPT.asm

Timestamp:

Apr 22, 2013, 10:32:25 AM (12 years ago)

Author:

aitotat@…

google:author:

aitotat@gmail.com

Message:

Changes to XTIDE Universal BIOS:

• Assited LBA is now the default geometry translation mode if MODULE_EBIOS is defined and drive supports LBA.
• P-Heads are now limited to 15 only when LARGE mode requires Revised ECHS translation.

File:

• trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/CreateDPT.asm (modified) (2 diffs)

trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/CreateDPT.asm

@@ -100 +100 @@
 
     ; Translate P-CHS to L-CHS
-    call    AtaGeometry_GetLCHStoAXBLBHfromAtaInfoInESSIandTranslateModeInDX
+    call    AtaGeometry_GetLCHStoAXBLBHfromAtaInfoInESSIwithTranslateModeInDX
     mov     [di+DPT.wLchsCylinders], ax
     mov     [di+DPT.wLchsHeadsAndSectors], bx
@@ -113 +113 @@
     jz      SHORT .LimitHeadsForLargeAddressingMode
 
-    or      cl, FLGL_DPT_LBA        ; Set LBA bit for Assisted LBA
+    ; Set LBA bit for Assisted LBA
+    or      cl, FLGL_DPT_LBA
     jmp     SHORT .NothingToChange
+
 .LimitHeadsForLargeAddressingMode:
-    MIN_U   bl, 15                  ; Cannot have 16 P-Heads in LARGE addressing mode
+    ; We cannot have 16 P-Heads heads in Revised ECHS mode (8193 or more cylinders)
+    ; but 16 heads are allowed when there are 8192 or less cylinders (ECHS).
+    ; Both of these are LARGE modes so do not confuse with NORMAL mode.
+    call    AtaGeometry_IsDriveSmallEnoughForECHS
+    jc      SHORT .NothingToChange
+    dec     bx                      ; Adjust 16 P-Heads to 15
+
 .NothingToChange:
     or      [di+DPT.bFlagsLow], cl  ; Shift count and addressing mode