请教sct文件中的“+last”是什么意思？
如题：STACK_IRAM2 0x200050B0 UNINIT 0x00006F40
{
gd32f30x_test_prerun.o (STACK_OV_TEST)
startup_gd32f30x_hd.o (STACK, +Last)
}
另外，这个mcu的ram大小是0xc000，0x200050B0+0x00006F40实际到0x2000BFF0，是留了16个字节没用么？ FIRST是把它放最前面，LAST就是最后面了 出处《Scatter File Syntax》：
Use FIRST and LAST to mark the first and last sections in an execution region if the placement order is important. For example, if a specific input section must be first in the region and an input section containing a checksum must be last.
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