YAMON™ is the ROM monitor used on MIPS Technologies' development boards.
YAMON ROM Monitor, Revision 02.06. Copyright (c) 1999-2004 MIPS Technologies, Inc. - All Rights Reserved. For a list of available commands, type 'help'. Compilation time = Mar 23 2004 16:50:44 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.a0.00.04.2b Board S/N = 0000000819 PCI bus frequency = 33.33 MHz Processor Company ID/options = 0x01 (MIPS Technologies, Inc.) / 0x00 Processor ID/revision = 0x93 (MIPS 24Kc) / 0x60 Endianness = Little CPU/Bus frequency = 25 MHz / 25 MHz Flash memory size = 4 MByte SDRAM size = 64 MByte First free SDRAM address = 0x800b3860
YAMON maintains a set of the environment variables in non-volatile memory. Example of environment variables in YAMON:
YAMON> set baseboardserial (RO) 0000000819 bootfile (R/W) bootprot (R/W) tftp bootserport (R/W) tty0 bootserver (R/W) 0.0.0.0 cpuconfig (R/W) ethaddr (RO) 00.d0.a0.00.04.2b fpu (R/W) gateway (R/W) 0.0.0.0 ipaddr (R/W) 10.0.0.100 memsize (RO) 0x04000000 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) 02.06
YAMON provides a set of functions callable by application. Pointers to these functions are located in a table located at 0x9fc00500.
An SREC kernel image can be loaded in YAMON as follows:
YAMON> load tftp://<tftp server name>/<srec file in /tftpboot>
for example, if I have a vmlinux.srec in /tftpboot on 10.0.0.139, then:
YAMON> load tftp://10.0.0.139/vmlinux.srec
YAMON> fread tftp://<ipaddr>/<filename> <address>
Load binary image to RAM or flash (depending on address) from TFTP server. The image is a binary file, not in ELF format.
There is also second-stage IDE bootloader mipsboot
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