Changeset 615 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Inc/IdeRegisters.inc

Timestamp:

Aug 7, 2021, 9:02:29 AM (4 years ago)

Author:

Tomi Tilli

Message:

• COMMAND_IDLE was not enough to disable standby timer from 1,8" Toshiba HDD. Apparently idle mode is the default mode. Added COMMAND_STAND_BY and that does what COMMAND_IDLE was supposed to do. Without COMMAND_STAND_BY the 1,8" Toshiba HDD experienced some random pauses (=>retry/abort... prompts) especially with Freedos 1.3RC4 but MS-DOS 7.10 (Win98) was mostly OK.
• Added FEATURE_ENABLE_ADVANCED_POWER_MANAGEMENT command to set drive to maximum performance mode when standby timer is disabled. This feature needs a bit more work. See TODO comments in sources.

File:

• trunk/XTIDE_Universal_BIOS/Inc/IdeRegisters.inc (modified) (2 diffs)

trunk/XTIDE_Universal_BIOS/Inc/IdeRegisters.inc

@@ -97 +97 @@
 COMMAND_IDENTIFY_DEVICE                 EQU     0ECh
 COMMAND_SET_FEATURES                    EQU     0EFh
+COMMAND_STAND_BY                        EQU     0E2h
 COMMAND_IDLE                            EQU     0E3h
 
@@ -103 +104 @@
 FEATURE_ENABLE_8BIT_PIO_TRANSFER_MODE   EQU     01h     ; CFA feature set only
 FEATURE_ENABLE_WRITE_CACHE              EQU     02h
+FEATURE_ENABLE_ADVANCED_POWER_MANAGEMENT    EQU 05h
 FEATURE_DISABLE_8BIT_PIO_TRANSFER_MODE  EQU     81h     ; CFA feature set only
 FEATURE_DISABLE_WRITE_CACHE             EQU     82h     ; Can also be used to flush cache
+FEATURE_DISABLE_ADVANCED_POWER_MANAGEMENT   EQU 85h     ; Might not be supported even if FEATURE_ENABLE_ADVANCED_POWER_MANAGEMENT is
 FEATURE_SET_TRANSFER_MODE               EQU     03h     ; Transfer mode goes to the Sector Count Register
     PIO_DEFAULT_MODE                    EQU     0h