Changeset 545 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH24h_HSetBlocks.asm

Timestamp:

Apr 19, 2013, 11:44:35 AM (12 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/AH24h_HSetBlocks.asm (modified) (2 diffs)

trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH24h_HSetBlocks.asm

@@ -63 +63 @@
     cmp     al, XTCF_DMA_MODE_MAX_BLOCK_SIZE
     jbe     SHORT .NoNeedToLimitBlockSize
+
+    ; Return error if we tried too large block for XT-CF.
+    ; Do not limit it to maximum supported since software calling AH=24h
+    ; must know what the actual block size is.
     cmp     BYTE [di+DPT_ATA.bDevice], DEVICE_8BIT_XTCF_DMA
-    je      SHORT AH1Eh_LoadInvalidCommandToAHandSetCF
+    je      SHORT ProcessXTCFsubcommandFromAL.AH1Eh_LoadInvalidCommandToAHandSetCF
 .NoNeedToLimitBlockSize:
 %endif ; MODULE_8BIT_IDE_ADVANCED
@@ -77 +81 @@
     pop     bx
     jnc     SHORT .StoreBlockSize
-    mov     bl, 1       ; Block size 1 will always work
+
+    ; Drive disabled block mode since we tried unsupported block size.
+    ; We must adjust DPT accordingly.
+    mov     bl, 1       ; Block size 1 will always work (=Block mode disabled)
 .StoreBlockSize:        ; Store new block size to DPT and return
     mov     [di+DPT_ATA.bBlockSize], bl