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I see this in Rev 1.0 (Jan 17, 2003) of 1510D (Host Adapter Spec)
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6.6.2.5 PCI Base Address Register (BAR) 4
Base address of the ATA Bus Master I/O registers.
Address Offset 20h
Default Value 00000001h
Attribute Bits 31-16 may be Read Only, Bits 15-3 Read/Write, Bits 2-0 Read Only.
Size 32 bits
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and then this just below that:
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The bus master -ATA function uses 16 bytes of I/O space. All bus master -ATA I/O space registers can be accessed as byte, word, or Dword quantities. The base address for these registers is PCI BAR 4. The description of the 16 bytes of I/O registers follows:
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If bits 15-3 are Read/Write, and Bits 2-0 are read only as 001, then how is one supposed to access all 16 bytes of I/O space? Shouldn't bits 3-0 be read-only, and 15-4 be R/W? If I size a PCI IDE Bus Master BAR 4 on any platform I can find, I get FFFFFFF1 instead of FFFFFFF9.
If this is an error, is it wrong in the "official" 1510D?
Thanks, Tom Sylla
