stm32f4 memory length

[Jython]

MEMORY {
RAM_INT : ORIGIN = 0x20000000, LENGTH = 192k
ROM_INT : ORIGIN = 0x00000000, LENGTH = 1M
}

im using the f407 has 192k ram,
the original is *LENGTH = 128k*,
but if i changed it to 192k, the board cant boot, why?
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