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Cisco VG202, Cisco VG202XM, Cisco VG204, and Cisco VG204XM Voice Gateways Software Configuration Guide
OL-16191-01
Appendix A Using the ROM Monitor
Using Debug Commands
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Ymodem uses CRC-16 error checking to validate each packet. Depending on the device that the
software is being downloaded from, this function might not be supported by Xmodem
• destination_file_name—Name of the system image file or the system configuration file. In order for
the voice gateway to recognize it, the name of the configuration file must be voice gateway_confg.
Follow these steps to run the xmodem console download command.
Procedure
Step 1 Move the image file to the local drive where Xmodem will execute.
Step 2 Enter the xmodem command.
Error Reporting
Because the ROM monitor console download uses the console to perform the data transfer, when an error
occurs during a data transfer, the system only displays the error messages on the console after the data
transfer terminates.
If you 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.
Using Debug Commands
Most ROM monitor debugging commands are functional only when the Cisco IOS software has crashed
or stops. If you enter a debugging command and the Cisco IOS crash information is not available, the
system displays the following error message:
"xxx: kernel context state is invalid, can not proceed."
The following are the 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