当前版本： 1.0
完成日期： 2011-2-23
作者： Jack Tan
Email: jiankemeng@gmail.com
版权声明： 转载请注明出处，商业用途请联系作者
1. YAMON Boot Log
YAMON ROM Monitor, Revision 02.13. Copyright (c) 1999-2006 MIPS Technologies, Inc. - All Rights Reserved. For a list of available commands, type 'help'. Compilation time = Dec 7 2006 19:01:12 Board type/revision = 0x02 (Malta) / 0x00 Core board type/revision = 0x04 (CoreFPGA) / 0x00 System controller/revision = Galileo / GT_64120A-B-2 FPGA revision = 0x0001 MAC address = 00.d0.a0.00.05.b6 Board S/N = 0000001194 PCI bus frequency = 33.33 MHz Processor Company ID/options = 0x01 (MIPS Technologies, Inc.) / 0x00 Processor ID/revision = 0x81 (MIPS 5Kf) / 0x0c Endianness = Big CPU/Bus frequency = 10000 kHz / 40 MHz Flash memory size = 4 MByte SDRAM size = 64 MByte First free SDRAM address = 0x800b7160 YAMON>
2. Config to bootstrap
2.0 Display enviroment variables
Using ‘setenv’ without any other arguments to display all enviroment variables:
YAMON> setenv baseboardserial (RO) 0000001194 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.a0.00.05.b6 fpu (R/W) gateway (R/W) 0.0.0.0 ipaddr (R/W) 0.0.0.0 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) 0.0.0.0 yamonrev (RO) 02.13
2.1 Set ethernet variables
YAMON does not supply explicit ethernet configure commands. You need to set following environment variables (YAMON predefine) for supporting ethernet:
ipaddr subnetmask gateway
Using ‘setenv’ to set these variable:
YAMON> setenv ipaddr 128.224.165.68 YAMON> setenv subnetmask 255.255.255.0 YAMON> setenv gateway 128.224.165.1
‘setenv’ store the environment variable permanently in the NVRAM.
After seting the ethernet, you can use the ‘ping’ command to test the network:
YAMON> ping 192.168.29.11
If the setting is OK, it’ll output like following:
. 64 bytes ICMP-ECHO-REPLY user data received from 192.168.29.11
Otherwise:
Error : Gateway IP-address is not set Diag : Gateway IP-address: 0.0.0.0 Hint : Check environment variable 'gateway'
2.2 Load & execute
YAMON supply ‘load’ command to load image from serial port or Ethernet to RAM. The only image type currently supported is SREC:
YAMON> load tftp://128.224.165.20/vlm-boards/15440/vmlinux.srec YAMON> load asc://tty0
‘load’ command does not support loading file to a user specified address.
You can use following YAMON predefined variable to specify the default value:
bootprot -------> specify the default boot protocol used by 'load' command (tftp/asc) bootserver -------> specify the default TFTP server ip bootfile -------> specify the default TFTP file bootserport -------> specify the default serial port used by 'load' command
So after executing following commands:
YAMON> setenv bootprot tftp YAMON> setenv bootserver 128.224.165.20 YAMON> setenv bootfile vlm-boards/15440/vmlinux.srec
We only need type ‘load’ without following long strings:
YAMON> load About to load tftp://128.224.165.20/vlm-boards/15440/vmlinux.srec Press Ctrl-C to break ........................................ ........................................ ........................................ ........................................ ................. Start = 0x80410b90, range = (0x80100000,0x80533085), format = SREC
After loading kernel, we need to use ‘go’ command to start kernel at target address:
YAMON> go . root=/dev/nfs rw nfsroot=192.168.1.1:/export/rootfs ip=192.168.1.2 console=ttyS0,38400
‘.’ reference to the default execution address which is from the last sucessful ‘load’ or ‘go’ command (if any). This default address can be showed by:
YAMON> go ? Address = 0x80410b90
Following command equal to the previous command:
YAMON> go 0x80410b90 root=/dev/nfs rw nfsroot=192.168.1.1:/export/rootfs ip=192.168.1.2 console=ttyS0,38400
2.3 Automatic bootstrap
YAMON use predefined variable ‘start’ as the automatic bootstrap command, YAMON will give the user the option to press Ctrl-C within 2 seconds to cancel execution of the start command.
We can set ‘startdelay’ variable to specify the delay seconds. But if set ‘startdelay’ to 0, the start command will not be executed.
YAMON> setenv start "load; go . root=/dev/nfs rw nfsroot=192.168.1.1:/export/rootfs ip=192.168.1.2 console=ttyS0,38400" YAMON> setenv startdelay 1
If you predefine some variables like following:
YAMON> setenv nfsboot "root=/dev/nfs rw nfsroot=192.168.1.1:/export/rootfs" YAMON> setenv addtty "console=ttyS0,38400" YAMON> setenv ip "ip=192.168.1.2"
You can define the ‘start’ like this:
YAMON> setenv start "load; go . ${nfsboot} ${addtty} ${ip}"
3. Memory commands
3.1 Disassemble instructions
Disassemble 5 instuctions at 0xbfc00100:
YAMON> dis 0xbfc00100 5 BFC00100: 3C1ABFC0 lui k0,0xbfc0 BFC00104: 8F5A0010 lw k0,16(k0) BFC00108: 001AD682 srl k0,k0,0x1a BFC0010C: 335A003F andi k0,k0,0x3f BFC00110: 3B5A0001 xori k0,k0,0x1
3.2 Dump memory
USAGE:
dump [-m][-8|-16|-32] address [size]
YAMON> dump -8 0xa0000000 0x40 A0000000: 08 00 ED E7 24 1A 00 00 00 00 00 02 00 00 00 03 ....$........... A0000010: 00 00 00 04 00 00 00 05 00 00 00 06 00 00 00 07 ................ A0000020: 00 00 00 08 00 00 00 09 00 00 00 0A 00 00 00 0B ................ A0000030: 00 00 00 0C 00 00 00 0D 00 00 00 0E 00 00 00 0F ................ YAMON> dump -32 0xa0000000 0x50 A0000000: 0800EDE7 241A0000 00000002 00000003 ....$........... A0000010: 00000004 00000005 00000006 00000007 ................ A0000020: 00000008 00000009 0000000A 0000000B ................ A0000030: 0000000C 0000000D 0000000E 0000000F ................ A0000040: 00000010 00000011 00000012 00000013 ................
3.3 Modify memory
Usage:
edit [-8|-16|-32] address
‘-’ cause the address to be decremented a unit (8/16/32 bit).
YAMON> edit -32 0x81000000 0x81000000: (00000000) 55aa55aa 0x81000004: (00000400) 55aa55aa 0x81000008: (00000001) 55aa55aa 0x8100000C: (FFFFFFDF) - 0x81000008: (55AA55AA) - 0x81000004: (55AA55AA) 0x81000008: (55AA55AA) 0x8100000C: (FFFFFFDF) .
Typing ‘.’ or Ctro-c to exit edit mode.
3.4 Fill memory
Usage:
fill [-8|-16|-32] address size data
YAMON> fill -16 0x82000000 0x20 0x55aa Filling from 0x82000000 to 0x8200001f with halfword data 0x55AA. YAMON> dump -16 0x82000000 0x20 82000000: 55AA 55AA 55AA 55AA 55AA 55AA 55AA 55AA U�U�U�U�U�U�U�U� 82000010: 55AA 55AA 55AA 55AA 55AA 55AA 55AA 55AA U�U�U�U�U�U�U�U�
4. Flash commands
4.1 Erase flash
Usage:
erase -e | address size
WARNING: Using following command, you need to be familiar with the flash start address and its size. Do not erase the YAMON!
erase 0xbfc00000 20
Following command erase environment flash, the system environment variables are reinitialised to factory default values.
erase -e
4.2 update flash
You can use ‘copy’, ‘disk’ and ‘load’ commands to update the flash
copy [-f] src_addr dst_addr size disk [-f] read hda/b/c/d sector count dst_addr
‘-f’ Don’t flush caches
Using ‘load’ to downloading S-records may include flash programming if the S-record is bound to a flash memory area. This area must be erased before downloading.
5. Miscellaneous
5.1 Reset system
YAMON> reset
5.2 Read/write TLB
YAMON> tlb Index Page VA G ASID PA0 C0 D0 V0 PA1 C1 D1 V1 --------------------------------------------------------------------- 0x0 4kB 0x00000000 n 0x00 0x00000000 0 n n 0x00000000 0 n n 0x1 4kB 0x00000000 n 0x00 0x00000000 0 n n 0x00000000 0 n n 0x2 4kB 0x00000000 n 0x00 0x00000000 0 n n 0x00000000 0 n n 0x3 4kB 0x00000000 n 0x00 0x00000000 0 n n 0x00000000 0 n n 0x4 4kB 0x00000000 n 0x00 0x00000000 0 n n 0x00000000 0 n n ......
You can use following command to edit the TLB:
YAMON> tlb 2 4kB 0 y ff 200000 3 y y 300000 3 n y YAMON> tlb Index Page VA G ASID PA0 C0 D0 V0 PA1 C1 D1 V1 --------------------------------------------------------------------- 0x0 4kB 0x00000000 n 0x00 0x00000000 0 n n 0x00000000 0 n n 0x1 4kB 0x00000000 n 0x00 0x00000000 0 n n 0x00000000 0 n n 0x2 4kB 0x00000000 y 0xff 0x00200000 3 y y 0x00300000 3 n y 0x3 4kB 0x00000000 n 0x00 0x00000000 0 n n 0x00000000 0 n n 0x4 4kB 0x00000000 n 0x00 0x00000000 0 n n 0x00000000 0 n n ......
5.3 Read/Write CP0
You can use ‘cp0′ to read and write CP0 register:
YAMON> cp0 BadVAddr = 0x0000000000000000 CacheErr = 0x00000000 Cause = 0x00808000 Compare = 0x00000000 Config = 0xb601c083 Config1 = 0x5ea3519b Context = 0x0000000000000000 Count = 0x33319249 DEPC = 0x0000000000000000 DESAVE = 0x0000000000000000 DataHi = 0x00000000 DataLo = 0x00000000 Debug = 0x02010000 EPC = 0xffffffff80028dac EntryHi = 0x0000000000000000 EntryLo0 = 0x0000000000000000 EntryLo1 = 0x0000000000000000 ErrCtl = 0x00000000 ErrorEPC = 0x0000000000000000 Index = 0x00000013 PRId = 0x0001810c PageMask = 0x00000000 PerfCntCount0 = 0x00000000 PerfCntCount1 = 0x00000000 PerfCntCtrl0 = 0x80000000 PerfCntCtrl1 = 0x00000000 Random = 0x0000002f Status = 0x24002c01 TagHi = 0x00000000 TagLo = 0x00000000 WatchHi = 0x0000000080000000 WatchLo = 0x0000000000000000 Wired = 0x00000000 XContext = 0x0000000000000000
YAMON> cp0 WatchLo WatchLo = 0x0000000000000000 YAMON> cp0 WatchLo 0x55aa YAMON> cp0 WatchLo WatchLo = 0x00000000000055aa
5.4 Help
YAMON> help cp1
MON> help cp1
NAME
cp1
SYNOPSIS
cp1 [ ( | ) [] ]
DESCRIPTION
Read/write CP1 control register(s).
If no arguments are applied, all CP1 control registers are read.
A register may be selected by name or number.
If a value is given, this value is written to the register, otherwise
the register is read.
Writing a CP1 control register takes effect immediately.
Settings of CP1 control registers are also applied to user applications
(started with 'go' or 'gdb').
OPTIONS