Changeset 610 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src

Timestamp:

May 22, 2021, 7:32:31 AM (3 years ago)

Author:

Tomi Tilli

Message:

Attempt to fix issues on some (low power?) drives with data corruption starting at 8 GB. I think the top LBA / head bits might get lost if the drive is busy (perhaps power saving feature) when we first output drive select.

File:

• trunk/XTIDE_Universal_BIOS/Src/Device/IDE/IdeCommand.asm (modified) (1 diff)

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

@@ -240 +240 @@
     call    IdeWait_PollStatusFlagInBLwithTimeoutInBH
 
+    ; Output again to make sure head bits are set. They were lost if the device
+    ; was busy when we first output drive select (although it shouldn't be busy
+    ; since we have waited error result after previous command). Some low power
+    ; 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
+
     ; Ignore errors from IDE Error Register (set by previous command)
     cmp     ah, RET_HD_TIMEOUT