Are you sure that you changed the boot options? Did you boot off the
USB stick or did you boot off the onboard flash? You need to interrupt
the boot process and tell it to boot off USB.
You should end up with a complete debian install once that's done. You
can edit the boot string in uboot to optionally mount ro or rw. Also,
you can enter your boot options for any other mount points as normal
in /etc/fstab.
Jason
On 15 Jul 2009, at 13:37, Zhiwei Liu wrote:
Jason,
Thanks for the comments.
The 2nd issue has been solved. I thinks that is all because I'm
using an old hub which is not functioning properly. Once I changed
it with a new switch, the network works fine.
The first issue remains. I didn't mean I was confusing the read-only
file system when booting from the flash.
Even if I boot from usb stick, I still got a read-only file system.
I have to fix it by typing the command:
"mount -n -o remount /"
I'm using a 2G usb stick. I prepared it using the following command:
---------------------------------------------------------------------
fdisk /dev/sda --- to create partition1
mke2fs -t ext2 /dev/sda1 --- format to ext2 file system
----------------------------------------------------------------------
Then I downloaded the file system from
http://casper.berkeley.edu/svn/trunk/roach/sw/binaries/filesystem/filesystem_etch_nfs_2009_07_07.tar.gz
I unzipped it and copied to my usb stick.
I also checked and fixed the file system using:
e2fsck -p /dev/sda1
But eventually the root was still mounted read-only file system when
booting from usb stick.
Any idea?
Best Regards,
--
Zhiwei Liu
On Wed, Jul 15, 2009 at 12:52 PM, Jason Manley
<[email protected]> wrote:
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
