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Reading from the flash chip on the TL-WR2543ND seems buggy. If the SPI flash driver tries to read too much data in one SPI transfer, the flash chip returns bogus values. This can be caused by a buggy flash chip on my board, or it can be a bug in our SPI driver. Add a workaround to the m25p80 driver until I find out the root cause of the problem. The patch allows to specify the maximum numner of bytes which can be read safely withint one SPI transfer. git-svn-id: svn://svn.openwrt.org/openwrt/trunk@29679 3c298f89-4303-0410-b956-a3cf2f4a3e73