84PCE:Ports:0006
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Contents
Synopsis
Port Number: 0006
Function: Unknown
Details
This port seems to affect the display refresh.
Bit [0]
Latches value written, no apparent effect.
Bit [1]
Reset this bit to disable display upadates.
Bit [2]
Set this bit to enable display updates if bit 1 is ever reset. ???
This bit is known to unlock protected mmio ports, such as SHA256. It is cleared every time the boot code interrupt handler runs.
Bit [3]
Writes do not latch; no apparent effect.
Bit [4]
Flash lock status.
Bits [7:3]
Writes do not latch; no apparent effect.
