Cisco Systems C819HG4GVK9, C819GUK9 manual Debug Commands, Error Reporting

Appendix C 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, the following error message is displayed:

"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
	Cisco 819 Integrated Services Routers Software Configuration Guide
OL-18906-02		C-13