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AM3517: Boot SPI Flash size lower limit

Part Number: AM3517

Hello,

When AM3517 boot from SPI Flash, Flash saize is limited between 128KBytes and 16 MBytes.

www.ti.com/.../sprugr0c.pdf

I understand upper limit(16MByte) because it is 24 bit addressing, but why is lower limit 128KBytes?
we can't use smaller size than 128KBytes?

Regards,
Takeshi Matsuzaki