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LINKER->Linker Scripts->Linker Script Language->Alignment

The alignment of a section is optional and is specified using the ALIGN keyword:

ALIGN(expression)

If no alignment expression is present, then the section will be aligned in accordance with the alignment requirements of the input sections that it contains.

__ttb_low ALIGN(16384) :
{
    __ttb_low_start = .;
    *(.ttb_low)
    __ttb_low_end = .;
} > flash

The run-time address of output section __ttb_low can be anywhere in the memory region named flash but it must be start on a 4k byte boundary.