mxssb: Fill in the details about command fields

Add details about the fields for all the commands, moreover align
the names of the fields with the documentation where it was not
confusing.
Signed-off-by: Marek Vasut <marex@denx.de>

mxssb.c

@@ -398,7 +398,7 @@ static void sb_encrypt_tag(
 		break;
 	case ROM_LOAD_CMD:
 		inst.load.address	= src->address;
-		inst.load.length	= src->length;
+		inst.load.count		= src->length;
 		inst.load.crc32		= crc32(src->payload, src->length);
 		break;
 	case ROM_CALL_CMD:

mxssb.h

@@ -115,21 +115,41 @@ struct sb_command {
 
 	union {
 
+	struct {
+		uint32_t	reserved[3];
+	} nop;
+	struct {
+		uint32_t	section_number;
+		uint32_t	section_length;
+		uint32_t	section_flags;
+	} tag;
 	struct {
 		uint32_t	address;
-		uint32_t	length;
+		uint32_t	count;
 		uint32_t	crc32;
 	} load;
+	struct {
+		uint32_t	address;
+		uint32_t	count;
+		uint32_t	pattern;
+	} fill;
 	struct {
 		uint32_t	address;
 		uint32_t	reserved;
+		/* Passed in register r0 before JUMP */
+		uint32_t	argument;
+	} jump;
+	struct {
+		uint32_t	address;
+		uint32_t	reserved;
+		/* Passed in register r0 before CALL */
 		uint32_t	argument;
 	} call;
 	struct {
-		uint32_t	section_number;
-		uint32_t	section_length;
-		uint32_t	section_flags;
-	} tag;
+		uint32_t	reserved1;
+		uint32_t	reserved2;
+		uint32_t	mode;
+	} mode;
 
 	};
 };