Changeset 28 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH9h_HInit.asm

Timestamp:

Aug 1, 2010, 5:57:24 PM (15 years ago)

Author:

Tomi Tilli

google:author:

aitotat

Message:

• v1.1.1 broke booting from foreign drives, it is now fixed.
• Improved error handling a bit.
• Longer DRQ and IRQ timeouts to minimize write timouts with some (bad) CF cards.
• Default boot menu drive should now be properly selected.

File:

• trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH9h_HInit.asm (modified) (3 diffs)

trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH9h_HInit.asm

@@ -2 +2 @@
 ; Project name  :   IDE BIOS
 ; Created date  :   9.12.2007
-; Last update   :   26.4.2010
+; Last update   :   1.8.2010
 ; Author        :   Tomi Tilli
 ; Description   :   Int 13h function AH=9h, Initialize Drive Parameters.
@@ -78 +78 @@
 .InitializeBlockMode:
     call    AH9h_InitializeBlockMode
-    ;mov    dl, [di+DPT.bDrvNum]        ; Restore DL
+    ;mov        dl, [di+DPT.bDrvNum]        ; Restore DL
     jc      SHORT .ReturnNotSuccessfull
     and     BYTE [di+DPT.bReset], ~FLG_RESET_nSETBLOCK
+
+    ; Force PIO mode 0
+    ;call   AH9h_ForcePioMode0
 
 .ReturnNotSuccessfull:
@@ -149 +152 @@
 .Return:
     ret
+
+
+;--------------------------------------------------------------------
+; AH9h_ForcePioMode0
+;   Parameters:
+;       DL:     Drive number
+;       DS:DI:  Ptr to DPT
+;   Returns:
+;       AH:     BIOS Error code
+;       CF:     Cleared if succesfull
+;               Set if any error
+;   Corrupts registers:
+;       AX, BX
+;--------------------------------------------------------------------
+;ALIGN JUMP_ALIGN
+;AH9h_ForcePioMode0:
+;   mov     bh, 08h     ; Parameter to Sector Count Register (PIO Flow Control Transfer Mode 0)
+;   mov     ax, 2303h   ; Feature: Set transfer mode based on value in Sector Count register
+;   int     13h
+;   jc      SHORT .FailedToForcePIO0
+;   ; Debug output here
+;   ret
+;.FailedToForcePIO0:
+;   ; Debug output here
+;   ret