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Identification of a OMAP3503 vs AM3703

Other Parts Discussed in Thread: AM3703

We are upgrading our design from a OMAP3505 to a AM3703.  We need to keep the S/W common between the 2 processor.  In the MIDR register, is the Variant Field adequite to distingish between the 2 processors?  The variant field in the OMAP 3503 is a 0x1 and in the AM3703 is a 0x3.  Is there a definition for the variant field for these processors?  Is ther more thatn one revision of each of these processors in the field?  The revision field in the OMAP 3503 is a 0x3 and in the AM3703 is a 0x2.