1 Some Settings can only be set through hardware Settings, during reset this device will get this set by hardware Settings.
2 I use i2c to control this device. after reset this device, i2c transmit failed.
3 it is connect through the RJ45 ethernet port and cable. but it is a chip. so i need to set it’s register throught i2c
4 this is a 7-Port Gigabit Ethernet Switch chip. The details data sheet and dmesg are attached.
i find this in dmesg, after reset, Gigabit Ethernet Switch chip have no send acknowledge, and eth0 becomes ready:
[ +26.258088] tegra-i2c 31c0000.i2c: no acknowledge from address 0x5f
[Aug22 01:17] eqos 2490000.ether_qos eth0: Link is Up - 100Mbps/Half - flow control off
[ +0.008390] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
KSZ9897S.pdf (1.55 MB)
log.txt (60.8 KB)