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 Configure uC5282 NVRAM

Overview of Steps

  • Create a 'cramfs' file system image of the netboot binary image. This is a compressed version of the netboot binary image.

          Note: Alternately, with more recent versions of rtems (Example: 4.9.x) , you can directly flash the netboot.flashimg.bin file.

  • Store this on a machine with a tftp server that can access your target
  • Connect the target (Example: a BPM chassis that has the Coldfire module in it) to your desktop or laptop.
  • Set the IP address environment variable and run the tftp server.
  • Transmit the file system image to the target.
  • Program it into flash memory
  • Using the uC5282 uCbootloader, set the environment variables
  • Boot the image.

(Much of this document is from an email from Till, 13 March 2008)

Commands

The syntax to set variables is:
B$ setenv ENVVAR value

To clear an environment variable:
B$ setenv ENVVAR

To show a list of all variables:
B$ printenv
To show the value of a single variable:
B$ printenv ENVVAR

Detailed Steps

1 Generate directory hierarchy on host computer. Simplest case - just a root directory containing the 'netboot' binary image:

mkdir cramfs_top
cp /afs/slac/package/rtems/<version>/target/ssrlApps<lvl>/m68k-rtems/uC5282/img/netboot.flashimg.bin cramfs_top/netboot.bin

 Note: If your board is a 80MHz version of Coldfire, then you want to use netboot and rtems from 4.9.4/target/rtems_p1/ssrlApps_p3/

2 Generate cramfs image (need mkcramfs utility) on host computer

mkcramfs cramfs_top cramfs.img

NOTE: in spite of the coldfire being a big-endian machine and cramfs internal data structures being susceptible to endianness, uCbootloader seems to expect a LITTLE-endian cramfs image (which is directly created by mkcramfs on a little-endian machine such as a x86 box)

 Note: For more recent vesions of the rtems (for example 4.9.x), one can tftp in netboot.flashimg.bin directly, without having to compress it first.

3 Connect to serial port

Connect serial port (Example: on BPM chassis) to serial port on your computer. (It must be a straight-through cable.) Connect to your local serial port using a terminal emulation program (Tera Term Pro on Windows works).

Note: If connecting through DIGI Terminal Port Server, connect the serial port of device/chassis containing Coldfire module, to one of the serial ports of the DIGI.

         To use iocConsole program to do serial communications with the DIGI:

         (a) Add your Coldfire EIOC to screeniocs file, the configuration file for iocConsole.

             For development environment, this file is in /afs/slac/g/lcls/epics/ioc/iocCommon/screeniocs.

             This file lets association of a DIGI Serial Port number with your <coldfire_eioc_nodename>

         (b) From a development linux host, such as lcls-dev2:

              > source /afs/slac/g/lcls/tools/script/ENVS.bash

              > iocConsole <coldfire_eioc_nodename>

                 Example: iocConsole 134.79.219.81

Power up the Coldfire device/chassis (Example: BPM chassis).

4 At the uCbootloader prompt B$, set the IP address environment variable, for example:

B$ setenv IPADDR0 134.79.219.81

Start the tftp program:

B$ tftp
uCTFTP Console 1.0 is running ...

5 Copy the cramfs.img to uc5282 target. (Your host must have a tftp server and must be able to access your target.)

(These instructions are for using tftp. To use the serial connection,
use the uCdimm Coldfire 5282 manual)

From your host:

hostname$tftp 134.79.219.81
tftp> verbose
Verbose mode on.
tftp> binary
mode set to octet
tftp> put cramfs.img

 NOTE: Use 'put netboot.flashimg.bin' if you are directly tftping the binary image (and not the compressed image) per Step 2.

You will see messages like these in your host session:

putting cramfs.img to 134.79.219.81:cramfs.img octet
Sent 270336 bytes in 20.2 seconds []
tftp>

You will see messages like these on your serial session:

...........
done

In your serial session, press ESC to exit tftp and return to the B$ prompt

6 Program the image into flash memory using 'program' command at B$ prompt:

B$ program
erase... done
write... done

Select boot file:

B$ setenv KERNEL 0:netboot.flashimg.bin

The board has now been flashed. Next you can do one of three things (four things counting nothing):
(7a) Test that you can boot the netboot image.
(7b) Set up for production. (Do this only if you feel confident that the
flashing worked.)
(7c) Boot up to test on development.

7a To boot the netboot image, set the necessary environment variables and type 'go' at the B$ prompt:

setenv KERNEL 0:netboot.flashimg.bin
setenv BP_SRVR 134.79.19.29
setenv BP_FILE afsnfs2:/afs/slac:package/rtems/4.9.1/target/ssrlApps/m68k-rtems/uC5282/bin/rtems.ralf
setenv NETMASK 255.255.252.0

B$ printenv
FACTORY=Arcturus Networks Inc.
REVISION=uC5282 Rev 1.1 16MB External Flash
SERIAL=X49E5FA37-01080
CONSOLE=ttyS0
KERNEL_ARGS=root=/dev/mtdblock0 quiet
HWADDR0=00:06:3B:00:F0:80
FW_VERSION=010808012
_0=10000000:1000000:RW
CACHE=on
KERNEL=0:netboot.flashimg.bin
BP_SRVR=134.79.19.29
BP_FILE=afsnfs2:/afs/slac:package/rtems/4.9.1/target/ssrlApps/m68k-rtems/uC5282/bin/rtems.ralf
IPADDR0=134.79.219.113
NETMASK=255.255.252.0

 Note: There is a slight difference in setting up the flash partition for a 4 M Coldfire and a 16 M Coldfire:

          For 4M Coldfire, the partition as above will work - so nothing needs to be set up specifically.

          For 16M Coldfire, the partition must be setup as follows:

           _0=10000000:100000:RW

           _1=10100000:F00000:RW

  Read the manual /afs/slac/package/rtems/<version>/src/ssrlApps<lvl>/netboot/README.uC5282 which explains how to deal with 16M of flash.

B$ go
uncompress... go! 0x40000

RTEMS bootloader by Till Straumann <strauman@slac.stanford.edu>
$Id: netboot.c,v 1.33 2009/02/05 08:39:20 strauman Exp $
CVS tag $Name: rtems-4-9-1-p2 $

Press 's' for showing the current NVRAM configuration
Press 'b' for manually entering filename/cmdline parameters only
Press '@' for continuing the netboot (BOOTP flag from NVRAM)
Press 'd' for continuing the netboot; enforce using BOOTP
Press 'p' for continuing the netboot; enforce using BOOTP
but use file and cmdline from NVRAM
Press 'm' for continuing the netboot; enforce using NVRAM config
Press 'R' to reboot now (you can always hit <Ctrl>-x to reboot)
Press any other key for this message

7b To set up for production and using DHCP/BOOTP, set these environment variables:

B$ printenv
FACTORY=Arcturus Networks Inc.
REVISION=uC5282 Rev 1.1 16MB External Flash
SERIAL=X4747745D-01DC9
CONSOLE=ttyS0
KERNEL=0:netboot.flashimg.bin*
KERNEL_ARGS=root=/dev/mtdblock0 quiet
HWADDR0=00:06:3B:00:AD:C9
FW_VERSION=010808004
_0=10000000:1000000:RW
CACHE=on
(next three are optional; depends whether you want the ioc to boot up on its own the first time; also depends on whether or not dhcp will be set up in advance)
DO_BOOTP=Y
AUTOEXEC=2
AUTOBOOT=2

7c To boot up and test on dev, at the uCbootloader prompt B$, set the rest of your environment variables.

B$ printenv
FACTORY=Arcturus Networks Inc.
REVISION=uC5282 Rev 1.1 16MB External Flash
SERIAL=X4747745D-01DC9
CONSOLE=ttyS0
KERNEL=0:netboot.flashimg.bin
KERNEL_ARGS=root=/dev/mtdblock0 quiet
HWADDR0=<macaddress>
FW_VERSION=010808004
_0=10000000:1000000:RW
CACHE=on
IPADDR0=<ipaddress>
DNS_SERVER=134.79.151.11
NTP_SERVER=134.79.151.11
NETMASK=255.255.252.0
GATEWAY=134.79.219.1
HOSTNAME=<hostname>
BP_PARM=INIT=/boot/g/lcls/epics/iocTop/<appname>/<tagname>/iocBoot/<eiocname>/st.cmd
LOGHOST=syslog-host
DNS_DOMAIN=slac.stanford.edu
BP_FILE=afsnfs2:/afs/slac:package/rtems/4.9.1/target/ssrlApps/m68k-rtems/uC5282/bin/rtems.ralf
BP_SRVR=134.79.19.29
DO_BOOTP=N

Appendix (Keep it alive!)

Here are some useful links that discuss flashing 16M Coldfire and 80 MHz Coldfire:


Share your Coldfire experiences, troubles, gotchas here:


 

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