Allow scrambling SRAM banks up to the full 8-bit range

man/rgblink.1

@@ -53,7 +53,7 @@ but also prohibits the use of banked VRAM.
 .Nm
 accepts the usual short and long options, such as
 .Fl V
-and 
+and
 .Fl -version .
 Options later in the command line override those set earlier, except for when duplicate options are considered an error.
 Options can be abbreviated as long as the abbreviation is unambiguous:
@@ -285,7 +285,7 @@ Certain regions allow omitting the size, in which case it defaults to its maximu
 .Bl -column "Region name" "Max value" "Size optional"
 Region name Ta Max size Ta Size optional
 .Cm romx Ta 65535 Ta \&No
-.Cm sram Ta 255 Ta \&No
+.Cm sram Ta 256 Ta \&No
 .Cm wramx Ta 7 Ta Yes
 .El
 .Pp

src/link/main.cpp

@@ -101,7 +101,7 @@ static void parseScrambleSpec(char *spec) {
 	// clang-format off: vertically align nested initializers
 	static UpperMap<std::pair<uint16_t *, uint16_t>> scrambleSpecs{
 	    {"ROMX",  std::pair{&options.scrambleROMX,  65535}},
-	    {"SRAM",  std::pair{&options.scrambleSRAM,  255  }},
+	    {"SRAM",  std::pair{&options.scrambleSRAM,  256  }},
 	    {"WRAMX", std::pair{&options.scrambleWRAMX, 7    }},
 	};
 	// clang-format on