Hi Zhiwei
Congratulations on getting your ROACH and booting it successfully!
comments below...
1) when I try to mount /dev/sda1 (the usb stick) as root
filesystem, by interrupting boot from flash, and "run usbboot".
The file system is mounted read-only. please see the attached
message file (read_only_error.log)
Although I can remount the / to R/W by typing the following command:
mount -n -o remount /
But I'm wondering does this affect anything? Is there any way to
get across this.
This is the standard arrangement. The flash filesystem is there
basically for emergencies and basic testing. It is tiny, though there
is a separate partition for user stuff that you can write to. If you
want a full install I highly recommend you mount the Debian Etch
filesystem either with a USB flash stick, or over the network. This
way you will have a full, standard Linux install. There are details
here: http://casper.berkeley.edu/wiki/Roach_getting_started
2) The 2nd problem is about the ethernet port of ROACH.
First I connected the ROACH board to a ethernet switch.
I try to assign the IP address through dhcp server by editting the /
etc/network/interfaces file
-----------------------------------
auto eth0
iface eth0 inet dhcp
-------------------------------------
then use the command:
ifdown eth0
ifup eth0
But I got "No DHCPOFFERS received."
Then I altered the /etc/network/interfaces file to assign a fixed IP
------------------------------------------------------------
auto eth0
iface eth0 inet static
address 128.235.92.250
netmask 255.255.255.0
network 128.235.92.0
broadcast 128.235.92.255
-------------------------------------------------------------
I got no complain after the ifdown and ifup command.
But I can't ping to any computers.
If the link light is up on the connection, but packets aren't getting
through (which seems to be the case), then there are a number of
things that could be wrong:
* you are on different subnets
* your switch is faulty
* your switch is configured with VLANs
* your switch/router is not forwarding broadcast DHCP requests
etc
This tells me your network connection is not working. It is not a
fault of ROACH. The fact that ROACH works plugged into a NIC
(mentioned below) confirms that its network is working fine. There is
a known issue with ROACH's ethernet at 1Gbps, but I tested your board
and the network before it was shipped, so I can confirm that there is
no problem with its network.
If I connect the ROACH to a computer directly. I can ping that
computer successfully and I can also ssh to ROACH from that
computer, only if the ROACH board was connected to the first NIC
port (eth0). There are there NIC cards in my computer (eth0, eth1,
eth2). You can't ping the ROACH board using eth1,eth2.
Linux/MAC/Windows by default only chooses one NIC for a given network
subnet. You can't have three NICs one the same subnet and expect a
single ping packet to go out over all three simultaneously by default.
They probably have separate IP addresses on different subnets. It will
only send the ping request out of the one card on the subnet to which
your ping request was directed.
These are standard networking concepts unrelated to ROACH-specific
implementations. I would suggest calling your computer/network
administrator to help you set up your network if you are having such
issues.
Jason
