xiaoxiang781216 commented on issue #353: multiple definition of `up_mdelay' URL: https://github.com/apache/incubator-nuttx/issues/353#issuecomment-590031621 But, arch code don't need reference any specific config for arch_timer.c/arch_rtc.c/arch_oneshot.c since this is design decision whether to use the implemetnetation inside these files: 1.Provide up_ timer/rtc API implmentation in arch/ or 2.Implement timer/oneshot/rtc driver and enable arch_timer.c/arch_rtc.c/arch_oneshot.c from defconfig I don't think the developer want to implement both and let the user select from defconfig. We don't need apply the change provided by @klmchp at all. @klmchp if you want to use arch_timer.c, please: 1.Remove up_delay.c from your chipset Make.defs directly 2.Enable CONFIG_ALARM_ARCH in your defconfig
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