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+<think>
+Okay, so I've been trying to get this Flash driver working for a specific device, but there's a command missing—specifically the 0xfd command. The user mentioned that it's related to DDR Octal I/O Fast Read for Micron MT35X chips and is similar to the 0xfc command used in Xilinx code. 
+
+Looking at the provided code snippet, I can see that various commands are handled in the decode_new_cmd function. Each case statement corresponds to a specific command. The user pointed out that the 0xfd command is missing, which means it's not being processed correctly right now.
+
+I need to figure out where and how to add support for this new command. Since 0xfc is already handled (like in cases such as FAST_READ4), adding 0xfd might involve a similar approach but possibly with some differences since MT35X might have specific requirements.
+
+First, I should identify the existing structure of the decode_new_cmd function. It looks like each case handles different commands and sets up the needed_bytes, pos, len, and state accordingly. For example, in cases like READ4 or QPP, they adjust s->needed_bytes based on certain conditions, such as whether four-byte address mode is enabled.
+
+Since 0xfd is for DDR Octal I/O Fast Read, I need to determine how it's handled in the Xilinx code with 0xfc. The user mentioned that it might be similar but not identical. So, perhaps adding a new case for 0xfd and replicating some of the logic from 0xfc while adjusting where necessary.
+
+I should check what operations are performed when 0xfc is processed. It looks like in cases like FAST_READ4, decode_fast_read_cmd(s) is called. For 0xfd, I might need to do something similar but maybe with different parameters or state transitions.
+
+Another thing to consider is the manufacturer and mode. The existing code checks for MAN_NUMONYX and specific modes (like QIO or DIO). Since MT35X is a Micron chip, the manufacturer will be different. So in the case of 0xfd, I should probably check if the manufacturer is Micron and whether it's operating in the correct mode.
+
+I might need to add a new case statement for 0xfd. Inside this case, I can set up the needed_bytes, pos, len, state as appropriate. Also, I should ensure that any necessary functions are called, similar to how decode_fast_read_cmd is used for other commands.
+
+Additionally, there's a note about DUMMY_CYCLE_WAIT being added earlier in the code. This might be relevant for 0xfd if it requires handling dummy cycles, so I need to check if that's part of the command processing.
+
+Since I'm not entirely sure about all the specifics, especially regarding how Xilinx handles 0xfc and what needs to change for 0xfd in this driver, I should probably look up the datasheet for MT35X chips to understand how the DDR Octal Fast Read command is structured. This will help me determine if there are any unique steps or state changes required.
+
+Once I have a better understanding of what 0xfd does and how it differs from existing commands like 0xfc, I can structure the code addition appropriately. This likely involves adding a new case in decode_new_cmd for 0xfd, setting up the necessary variables, and calling the appropriate functions to handle data collection or other operations.
+
+Finally, after making these changes, I should test to ensure that the new command is recognized and processed correctly by the driver. This would involve sending 0xfd commands and verifying that the Flash device responds as expected.
+</think>
+
+To address the missing support for the 0xFD command in the Flash driver, we need to add a new case statement in the `decode_new_cmd` function. Here's how this can be done step-by-step:
+
+1. **Identify the Correct Manufacturer:**
+   - The existing code checks for `MAN_NUMONYX`. Since 0xFD is for Micron MT35X chips, we'll check if the manufacturer is Micron.
+
+2. **Check the Operating Mode:**
+   - Determine which modes (e.g., DIO, QIO) are relevant for 0xFD in MT35X chips and ensure that mode checks are included.
+
+3. **Set Up Command Handling:**
+   - In the new case for 0xFD, set `s->needed_bytes`, `pos`, `len`, and `state` as appropriate.
+   - Call any necessary functions similar to how `decode_fast_read_cmd` is used for other commands.
+
+4. **Handle Dummy Cycles if Needed:**
+   - If 0xFD requires dummy cycles, ensure that the state transition accounts for this, possibly using the existing `DUMMY_CYCLE_WAIT` case or adding a new one if necessary.
+
+5. **Add the New Case in decode_new_cmd:**
+   - Insert the case statement after identifying where it fits logically, perhaps near other fast read commands.
+
+Here is how the code can be updated:
+
+```c
+case 0xfd:
+    // Check for Micron manufacturer and appropriate mode
+    if (chip_info->manufacturer == MAN_MICRON) {
+        // Assume ' Dio mode is required; adjust as per MT35X datasheet
+        if (current_mode == MODE_DIO) {
+            s->needed_bytes = ...;
+            s->pos = 0;
+            s->len = ...;
+            s->state = STATE_RECEIVING_DATA;
+            // Call necessary functions if any
+            decode_fast_read_cmd(s);
+        } else {
+            // Handle error or unsupported mode
+        }
+    } else {
+        // Manufacturer not Micron; ignore or handle error
+    }
+    break;
+```
+
+**Note:** Replace the placeholders (`...`) with appropriate values based on MT35X specifications. This includes setting `needed_bytes` correctly, possibly including address and data phases.
+
+By following these steps, the 0xFD command for DDR Octal I/O Fast Read in Micron MT35X chips will be properly handled by the Flash driver.
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