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cf292fafcb
Allow VRAM presence only in optional bank. control: Implement banks. The BAR is 64MB. The little-endian/big-endian ranges repeat every 16MB. An endian range can be addressed in d128 (wide) mode or d64 mode. In d128 mode, there is a 4MB range followed by an undefined 4MB range. bytes 0..7 belong to the standard bank and bytes 8..15 belong to the optional bank. In d64 mode: - 2MB mirror ranges at 0MB and 2MB (both have the same read/write behavor: write to both banks or read from the standard bank. - 2MB standard bank rage at 4MB. - 2MB optional bank range at 6MB.