chip_ready patch for SST39VF640xB

[Niels Gram Jeppesen]

Hi,

In cfi_cmdset_0002.c, chip_ready seems to be unreliable on the SST39VF640xB chip. The attached patch add two extra reads to chip_ready in accordance with the chip data sheet (page 3, "Write Operation Status Detection"). This seems to make the write cycle completion detection reliable. I have not tested the patch on any other chips but I would think that it would be harmless on chips that do not need the extra reads.

Best regards; hope this helps,

Niels


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