weizh126 Posted December 19, 2010 Share Posted December 19, 2010 When I read ACPI Spec, I find this example OperationRegion (GIO, SystemIO, 0x125, 0x1) Field (GIO, ByteAcc, NoLock, Preserve) { IDEI, 1, // IDEISO_EN - isolation buffer IDEP, 1, // IDE_PWR_EN - power IDER, 1 // IDERST#_EN - reset# } and also the following description Syntax OperationRegion (RegionName, RegionSpace, Offset, Length) Arguments Declares an operation region named RegionName. Offset is the offset within the selected RegionSpace at which the region starts (byte-granular), and Length is the length of the region in bytes. What's the exactly meaning of Length? There are three arguments, but why the length in the example is one byte ? Is it just because one argument takes one bit, so three arguments take three bits, the unwanted bits (5 bits) are set to zero? Sorry for my silly question,and really appreciate your answer. Thanks. Quote Link to comment Share on other sites More sharing options...
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