xiaoxiang781216 commented on issue #353: multiple definition of `up_mdelay' URL: https://github.com/apache/incubator-nuttx/issues/353#issuecomment-590074752 Not a whole architecture, different chipset in the same architecture can select the different approach because each chipset has own Make.defs and can include/exclude up_delay.c as needed, but the same chipset must share the same decision. The code under drivers/timers/arch_*.c just want to simplify the chipset developer work, supporting both approach just make their work hard than before without any benefit. So I don't think the last issue is a real limitation, the developer just need decide which method he want to use and forget another one totally before writing the code.
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