Yamon
Table of Contents
Yamon is the bootloader on the MIPS Malta boards, as well as some PowerPC boards.
Bootloader Initialization
YAMON ROM Monitor, Revision 02.11. Copyright (c) 1999-2006 MIPS Technologies, Inc. - All Rights Reserved. For a list of available commands, type 'help'. Compilation time = Feb 16 2006 18:36:44 Board type/revision = 0x02 (Malta) / 0x00 Core board type/revision = 0x07 (CoreFPGA-2) / 0x00 System controller/revision = MIPS SOC-it 101 OCP / 1.3 SDR-FW-1:1 FPGA revision = 0x0001 MAC address = 00.d0.a0.00.04.3e Board S/N = 0000000838 PCI bus frequency = 33.33 MHz Processor Company ID/options = 0x01 (MIPS Technologies, Inc.) / 0x00 Processor ID/revision = 0x93 (MIPS 24Kc) / 0x74 Endianness = Big CPU/Bus frequency = 25 MHz / 25 MHz Flash memory size = 4 MByte SDRAM size = 256 MByte First free SDRAM address = 0x800b6580 YAMON>
Configuring the Network Interface
Finding and Changing the MAC Address
You can find the MAC address with the setenv command. It cannot be reset or changed.
YAMON> setenv
Example:
YAMON> setenv baseboardserial (RO) 0000000838 bootfile (R/W) kernel_mipsmalta24kc-1 bootprot (R/W) tftp bootserport (R/W) tty0 bootserver (R/W) 192.168.99.3 cpuconfig (R/W) ethaddr (RO) 00.d0.a0.00.04.3e fpu (R/W) gateway (R/W) 0.0.0.0 ipaddr (R/W) 192.168.99.161 memsize (RO) 0x10000000 modetty0 (R/W) 38400,n,8,1,hw modetty1 (R/W) 38400,n,8,1,hw prompt (R/W) YAMON start (R/W) startdelay (R/W) subnetmask (R/W) 255.255.255.0 yamonrev (RO) 02.11
Changing the IP Address
The IP address is an environment variable, and can be modified using the setenv command.
YAMON> setenv ipaddr <ip address>
Example:
YAMON> setenv ipaddr 192.168.99.161
Downloading the Kernel
The load command is used to download the kernel. If the environment is set up completely, then you can simply type the load command. Otherwise, it takes the following format:
YAMON> load tftp://<host ip>/<file name>
Example:
YAMON> load About to load tftp://192.168.99.3/kernel_mipsmalta24kc-1 Press Ctrl-C to break ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ................................... Start = 0x80443000, range = (0x80100000,0x80467297), format = SREC
Booting the Kernel
The go command is used to boot the kernel. It typically takes the following format:
YAMON> go . <kernel command line>
You can also specify an address, but it will use the address of the last successful load command.
Examples:
With DHCP:
YAMON> go . root=/dev/nfs rw ip=dhcp
Without DHCP:
YAMON> go . root=/dev/nfs rw nfsroot=[nfs ip]:/path/to/rfs ip=[ip]:[nfs ip]:[gw ip]::::any
