Johnny,

Excellent write up.

On 09/08/2017 08:07 AM, Johnny Hughes wrote:

On 09/01/2017 10:27 PM, Binary Buddha wrote:

...

ifconfig -a I get the normal expected output for eth0 and lo "UP,BROADCAST,RUNNING,MULTICAST”. But, I never receive a DHCP address. No packet info because it’s not connecting. As mentioned before, not even the lights on the ethernet port blink.

I’m on the RPi 3 Model B V1.2. Is the version the same? Any chance you clean install with the same version of Centos that’s posted to see if it still works for you?

I have a RPi 3, Model B V 1.2 , Copyright Raspberry Pi 2015

I grabbed this image:

http://mirror.centos.org/altarch/7/isos/armhfp/CentOS-Userland-7-armv7hl-Min...

I put a San Disk 64GB Extreme Plus card into my CentOS-7 x86_64 laptop card reader .. it showed up as /dev/mmcblk0 and I made sure I unmounted it.

I used this command to push the image to the card:

xzcat ./CentOS-Userland-7-armv7hl-Minimal-1611-RaspberryPi3.img.xz | sudo dd of=/dev/mmcblk0 status=progress bs=8M

I then did this to make sure the dd finished:

sudo sync

I then wanted to go ahead and bump up the 'root partition' size to fill the card, so I opened up the card using fdisk:

sudo fdisk /dev/mmcblk0

It shows this as the main Linux partition:

/dev/mmcblk0p3 2074624 6268927 2097152 83 Linux

I want to make the 3rd partition use all space .. so, I deleted partition 3 (d command) and recreated it (n command, the primary (p) and 3rd partition (3)) starting at the same sector (2074624) ending at the last sector on the card (124735487). now it looks like this:

/dev/mmcblk0p3 2074624 124735487 61330432 83 Linux

So partition 3 went from 2 GB to 60 GB

Now I will use the w command to exit fdisk.

Took the card out of my laptop .. put it into the RPi 3

Hooked up NIC to my network and an HDMI monitor to the HDMI port and turned it on to boot:

This is what appears on the console:

https://people.centos.org/hughesjr/rpi3-boot.jpg

(you can see that the NIC port turned on, 100Mbps, the lights are working normally on the port)

Plugged in the keyboard .. logged on as root.

I have an IP address:

[root@centos-rpi3 ~]# ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether b8:27:eb:ef:55:fd brd ff:ff:ff:ff:ff:ff inet 192.168.0.41/24 brd 192.168.0.255 scope global dynamic eth0 valid_lft 2589sec preferred_lft 2589sec inet6 ::ba27:ebff:feef:55fd/64 scope global mngtmpaddr dynamic valid_lft 3600sec preferred_lft 3600sec inet6 fe80::ba27:ebff:feef:55fd/64 scope link valid_lft forever preferred_lft forever

So, the image works fine.

If you are not getting an ip address and if the lights are not working, then:

1. You have a network cable issue
2. You have a hardware issue on either the NIC port on the RPi or the

NIC Port on your switch/hub/router. 3) You have some kind of routing issue between your dhcp server and the RPi3 where the packets can not traverse .. BUT, not likely, you said that the lights don't work. 4) You have a software issue, where your dhcp server does not recognize the dhcp request from this device .. again, not likely if the lights are not working.

I then ran the command: resize2fs /dev/mmcblk0p3

(to resize my root partition that I grew with fdisk from my laptop)

rebooted

Everything works fine.

SO .. the image does work with RPi3 and a standard gbit netgear hub and my normal internet provider's gbit router as the dhcp server.

I do think that you said the lights are not working .. if that is the case, then there is LIKELY something wrong with something physical between the two ports or the cable. I suppose it could also be a power supply issue for the unit.

Can you use a different OS image on a different SDCARD to boot and get connectivity with the same setup?

Did you check the sha256sum of your image before you burned it?

Thanks, Johnny Hughes

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