刷的官方buildroot包，设置了ip，但主机一直ping不通，日志一直打印 Aug 4 09:57:15 RK356X user.notice phc2sys: [176.502] Waiting for ptp4l... Aug 4 09:57:16 RK356X user.notice phc2sys: [177.505] Waiting for ptp4l... Aug 4 09:57:17 RK356X user.notice phc2sys: [178.507] Waiting for ptp4l... Aug 4 09:57:18 RK356X user.notice phc2sys: [179.510] Waiting for ptp4l... Aug 4 09:57:19 RK356X user.notice phc2sys: [180.512] Waiting for ptp4l... Aug 4 09:57:20 RK356X user.notice phc2sys: [181.515] Waiting for ptp4l... Aug 4 09:57:20 RK356X user.notice ptp4l: [181.804] selected local clock 02520f.fffe.f0b434 as best master Aug 4 09:57:21 RK356X user.notice phc2sys: [182.517] Waiting for ptp4l... Aug 4 09:57:22 RK356X user.notice phc2sys: [183.519] Waiting for ptp4l... Aug 4 09:57:23 RK356X user.notice phc2sys: [184.522] Waiting for ptp4l... Aug 4 09:57:24 RK356X user.notice phc2sys: [185.525] Waiting for ptp4l... Aug 4 09:57:25 RK356X user.notice phc2sys: [186.528] Waiting for ptp4l...