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Perform the length adjustment whereby a value of 0 in the STC represents a transfer length of 0x10000 at the point where the TC is loaded at the start of a DMA command rather than just when a TI (Transfer Information) command is executed. This better matches the description as given in the datasheet. Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> Reviewed-by: Laurent Vivier <laurent@vivier.eu> Message-Id: <20210304221103.6369-12-mark.cave-ayland@ilande.co.uk>