Flash memory problem

Yes, when I transfer 65536 (64K) of data, it works fine. the result is as followed for 64KB: (the last 3 results)

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Value at 140FFF4 is 16381, written is 16381

Value at 140FFF8 is 16382, written is 16382

Value at 140FFFC is 16383, written is 16383

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my flash base is 0x1400000. the last data was written into 0x140FFFC as shown above.

now i set the size to be 131072 (128K). the output is:

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Error writing into flash: -5

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So, I understand that now the first 64kb write at offset=0 is ok while the second write at offset=0x10000 fails. Is this right?

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Yes, at second write at offset 0x10000 fails.