Changeset 545 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/EBIOS/AH48h_GetExtendedDriveParameters.asm

Timestamp:

Apr 19, 2013, 11:44:35 AM (11 years ago)

Author:

aitotat@…

google:author:

aitotat@gmail.com

Message:

Changes to XTIDE Universal BIOS:

• Integrated XT-CFv3 support by James Pearce.
• XT-CFv2 memory mapped I/O and DMA modes are no longer supported (but PIO mode is).

File:

• trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/EBIOS/AH48h_GetExtendedDriveParameters.asm (modified) (1 diff)

trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/EBIOS/AH48h_GetExtendedDriveParameters.asm

@@ -139 +139 @@
     sbb     dx, (MAX_SECTOR_COUNT_TO_RETURN_PCHS+1) >> 16
     sbb     bx, cx      ; Zero
-    jnc     SHORT .ReturnWithSuccess
+    jnc     SHORT .DoNotSetChsFlag
     or      BYTE [di+EDRIVE_INFO.wFlags], FLG_CHS_INFORMATION_IS_VALID
 
+    ; We store something to P-CHS anyway since some HW detection programs
+    ; ignore the CHS flag. And we should at least clear the variables anyway
+    ; since the same buffer is used for all drives so it contains parameters
+    ; from previously scanned drive.
+.DoNotSetChsFlag:
     eMOVZX  dx, BYTE [es:si+DPT.bPchsHeads]
     mov     [di+EDRIVE_INFO.dwHeads], dx