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

Timestamp:

Aug 7, 2021, 9:02:29 AM (3 years ago)

Author:

aitotat

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/DeviceIDE.inc (modified) (1 diff)

trunk/XTIDE_Universal_BIOS/Inc/DeviceIDE.inc

@@ -31 +31 @@
 TIMEOUT_MAXIMUM         EQU     255         ; We would actually want 31 seconds here but I don't think there are so slow drives
 
+
+; ATA specs say that in standby mode time to respond could be as long as 30 seconds
+; Note that some low-power drives (like Toshiba 1,8" HDD) have power management enabled by default
+; TODO: It might be better to define timeouts in IDEVARS (in ROMVARS) or in DPT. Having even a single bit in DPT means
+; we could adjust timeouts on runtime when enabling or disabling power management.
 %ifdef MODULE_POWER_MANAGEMENT
     TIMEOUT_BSY         EQU     TIMEOUT_MOTOR_STARTUP