Changeset 611 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Device

Timestamp:

May 22, 2021, 9:33:59 PM (4 years ago)

Author:

Tomi Tilli

Message:

Now actually fixed the problem some drives had when crossing 8GB. The problem only occurred with LBA48 commands. Sector count high was outputted to LBA(31:24) and vice versa.

File:

• trunk/XTIDE_Universal_BIOS/Src/Device/IDE/IdeCommand.asm (modified) (2 diffs)

trunk/XTIDE_Universal_BIOS/Src/Device/IDE/IdeCommand.asm

@@ -174 +174 @@
 %ifdef MODULE_EBIOS
     eMOVZX  ax, [bp+IDEPACK.bLbaLowExt]     ; Zero sector count
+    xchg    al, ah      ; LBA low ext to AH, zero sectors to AL
     mov     cx, [bp+IDEPACK.wLbaMiddleAndHighExt]
     call    OutputSectorCountAndAddress
@@ -245 +246 @@
     ; drives (CF cards, 1.8" HDDs etc) have some internal sleep modes that
     ; might cause trouble? Normal HDDs seem to work fine.
-    mov     al, [bp+IDEPACK.bDrvAndHead]
-    OUTPUT_AL_TO_IDE_REGISTER   DRIVE_AND_HEAD_SELECT_REGISTER
+    ;
+    ; Now commented away since this fix was not necessary. Let's keep it here
+    ; if some drive someday has problems crossing 8GB
+    ;mov        al, [bp+IDEPACK.bDrvAndHead]
+    ;OUTPUT_AL_TO_IDE_REGISTER  DRIVE_AND_HEAD_SELECT_REGISTER
 
     ; Ignore errors from IDE Error Register (set by previous command)