A-7
Cisco VG202 and Cisco VG204 Voice Gateways Software Configuration Guide
OL-16191-01
Appendix A Using the ROM Monitor
Debug Commands
Error Reporting
Because the ROM monitor console download uses the console to perform the data transfer, when an error
occurs during a data transfer, error messages are only displayed on the console once the data transfer is
terminated.
If you have changed the baud rate from the default rate, the error message is followed by a message
telling you to restore the terminal to the baud rate specified in the configuration register.
Debug Commands
Most ROM monitor debugging commands are functional only when Cisco IOS software has crashed or
is halted. If you enter a debugging command and Cisco IOS crash information is not available, you see
the following error message:
"xxx: kernel context state is invalid, can not proceed."
The following are ROM monitor debugging commands:
•
stack
or
k
—Produces a stack trace; for example:
rommon 6>
stack
Stack trace:
PC = 0x801111b0
Frame 00: FP = 0x80005ea8 PC = 0x801111b0
Frame 01: FP = 0x80005eb4 PC = 0x80113694
Frame 02: FP = 0x80005f74 PC = 0x8010eb44
Frame 03: FP = 0x80005f9c PC = 0x80008118
Frame 04: FP = 0x80005fac PC = 0x80008064
Frame 05: FP = 0x80005fc4 PC = 0xfff03d70
•
context
—Displays processor context; for example:
rommon 7>
context
CPU context of the most recent exception:
PC = 0x801111b0 MSR = 0x00009032 CR = 0x53000035 LR = 0x80113694
CTR = 0x801065e4 XER = 0xa0006d36 DAR = 0xffffffff DSISR = 0xffffffff
DEC = 0xffffffff TBU = 0xffffffff TBL = 0xffffffff IMMR = 0xffffffff
R0 = 0x00000000 R1 = 0x80005ea8 R2 = 0xffffffff R3 = 0x00000000
R4 = 0x8fab0d76 R5 = 0x80657d00 R6 = 0x80570000 R7 = 0x80570000
R8 = 0x00000000 R9 = 0x80570000 R10 = 0x0000954c R11 = 0x00000000
R12 = 0x00000080 R13 = 0xffffffff R14 = 0xffffffff R15 = 0xffffffff
R16 = 0xffffffff R17 = 0xffffffff R18 = 0xffffffff R19 = 0xffffffff
R20 = 0xffffffff R21 = 0xffffffff R22 = 0xffffffff R23 = 0xffffffff
R24 = 0xffffffff R25 = 0xffffffff R26 = 0xffffffff R27 = 0xffffffff
R28 = 0xffffffff R29 = 0xffffffff R30 = 0xffffffff R31 = 0xffffffff
•
frame
—Displays an individual stack frame.
•
sysret
—Displays return information from the last booted system image. This information includes
the reason for terminating the image, a stack dump of up to eight frames, and, if an exception is
involved, the address where the exception occurred; for example:
rommon 8>
sysret
System Return Info:
count: 19, reason: user break
pc:0x801111b0, error address: 0x801111b0
Stack Trace:
FP: 0x80005ea8, PC: 0x801111b0
FP: 0x80005eb4, PC: 0x80113694
FP: 0x80005f74, PC: 0x8010eb44
