[coreboot] How to find out "page size" of a flash chip?

[FENG Yu Ning]

In flashchip.c, there is (just an example),

        /* Vendor       Chip                    ...     Page size (B)   ...     
*/
        ...
        {"SST",         "SST25VF040B",  ...     256,            ...     },

How to find out the number 256? I have read through the datasheet of
that chip, which mentioned 4K sector, 32K and 64K blocks, but no
"page". There is neither an operation which needs an address with
value 0 in the least significant 8 bits.

Or, the number does not come out of a datasheet?

Thanks,
yu ning

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