xiaoxiang781216 commented on code in PR #6251:
URL: https://github.com/apache/incubator-nuttx/pull/6251#discussion_r871448752


##########
arch/arm/src/c5471/c5471_ethernet.c:
##########
@@ -1892,7 +1892,7 @@ static int c5471_ifup(struct net_driver_s *dev)
 
   putreg32((getreg32(EIM_CTRL) | EIM_CTRL_ESM_EN), EIM_CTRL);      /* enable 
ESM */
   putreg32((getreg32(ENET0_MODE) | ENET_MODE_ENABLE), ENET0_MODE); /* enable 
ENET */
-  up_mdelay(100);
+  nxsig_usleep(100000);

Review Comment:
   Yes, that's why I just modify the sleep time >= 10ms, since the default tick 
is 10ms in tick mode:
   https://github.com/apache/incubator-nuttx/blob/master/sched/Kconfig#L89-L92
   It's hard to imagine that it's good to busy loop more than 10ms.



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