Re: kgdb debugging
On Wed, Oct 08, 2008 at 09:43:38PM -0700, alan yang wrote: > thank you all, device.hints solved it! > > On Tue, Oct 7, 2008 at 11:14 AM, Julian Elischer <[EMAIL PROTECTED]> wrote: > > alan yang wrote: > >> > >> Could people shed some light how to get remote debugging going, must > >> be something that i overlooked, really appreciate. > >> > >> Two FreeBSD7 systems, target and development, connected with null > >> modem cable on each's COM1. > >> > >> step 1) > >>- rebuild kernel with following options: > >>options DDB > >>options KDB > >>options GDB > >> > >>makeoptions DEBUG=-g > > > > add hints.dev.uart.0.flags=0xc0 > > (or whatever it is) (see man uart or man sio) > > to /boot/device.hints This is a bad recommendation. *DO NOT* modify device.hints!!! You can override device.hints entries, or add your own, by using loader.conf. Example, taken from our loader.conf on production systems: # There is no COM2 on this system. hint.sio.1.disabled="1" Thus, in your case, this should suffice (note "hint", not "hints" like the above paragraph says): hint.dev.uart.0.flags="0xc0" -- | Jeremy Chadwickjdc at parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB | ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: kgdb debugging
thank you all, device.hints solved it! On Tue, Oct 7, 2008 at 11:14 AM, Julian Elischer <[EMAIL PROTECTED]> wrote: > alan yang wrote: >> >> Could people shed some light how to get remote debugging going, must >> be something that i overlooked, really appreciate. >> >> Two FreeBSD7 systems, target and development, connected with null >> modem cable on each's COM1. >> >> step 1) >>- rebuild kernel with following options: >>options DDB >>options KDB >>options GDB >> >>makeoptions DEBUG=-g > > add hints.dev.uart.0.flags=0xc0 > (or whatever it is) (see man uart or man sio) > to /boot/device.hints > >> >> step 2) >>- from development system >>cd to /usr/src/sys/i386/comiple/MYKERNEL >>kgdb -r /dev/cuad0 kernel.debug >> >>it displays the following: >>Switching to remote protocol >>Ignoring packet error, continuing >>. >>Couldn't establish connection to remote target >>Malformed response to offset query, timeout >> >> step 3) >>- from targetsystem: >>1. Ctrl + Alt + Esc to go into db >>2. from db> type gdb >>3. it displays: "The remote GDB backend could not be >> selected" >> >> >> >> On Mon, Oct 6, 2008 at 5:12 PM, alan yang <[EMAIL PROTECTED]> wrote: >>> >>> the problem is, when entering gdb from db as described in the following: >>> -- >>> Enter ing gdb from ddb >>> In FreeBSD you can build a kernel with support for both ddb and gdb. >>> You can then >>> change backwards and forwards between them. For example, if you're in >>> ddb, you can >>> go to gdb like this: >>> db> gdb >>> Next trap will enter GDB remote protocol mode >>> db> si step a single instruction to reenter ddb >>> -- >>> after typing gdb command, it says: "The remote GDB backend could not >>> be selected" >>> that i am not sure what this indicates; looking at subr_kdb.c, wonder >>> maybe kdb_dbbe_set is not set? seems kdb_dbbe_set is not referenced >>> anywhere, not sure how to get it right. >>> >>> thanks for shed some light ... >>> >>> On Mon, Oct 6, 2008 at 4:26 PM, Pietro Cerutti <[EMAIL PROTECTED]> wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA512 alan yang wrote: | hi, there, | | wonder people can shed some lights on remote debugging. i have | freebsd7 configured with option DDB / KDB / GDB but after entering the | db on the target system the command gdb gives "the remote GDB backend | could not be selected". | | i browsed through the mailing list, and do find 1 similar post but | without answer. | | thanks in advance & apology if i overlooked things ... I suggest the following tutorial: http://www.lemis.com/grog/Papers/Debug-tutorial/tutorial.pdf Have fun :) | | cheers, | alan | ___ | [EMAIL PROTECTED] mailing list | http://lists.freebsd.org/mailman/listinfo/freebsd-hackers | To unsubscribe, send any mail to "[EMAIL PROTECTED]" - -- Pietro Cerutti [EMAIL PROTECTED] PGP Public Key: http://gahr.ch/pgp -BEGIN PGP SIGNATURE- Version: GnuPG v2.0.9 (FreeBSD) iEYEAREKAAYFAkjqnpQACgkQwMJqmJVx945RSwCgoDb0JTr8LSFDB1vpAbGUjb76 ZH0An19HpFVJJTUB5/XnyZc0pIDzgxc3 =6Pdm -END PGP SIGNATURE- >> ___ >> [EMAIL PROTECTED] mailing list >> http://lists.freebsd.org/mailman/listinfo/freebsd-hackers >> To unsubscribe, send any mail to "[EMAIL PROTECTED]" > > ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: kgdb debugging
On Tue, Oct 7, 2008 at 10:53 AM, alan yang <[EMAIL PROTECTED]> wrote: > Could people shed some light how to get remote debugging going, must > be something that i overlooked, really appreciate. > Do you have the right flags for sio or uart in /boot/device.hints? I have this (for a recent HEAD):: hint.uart.0.flags="0x90" You are probably using sio as it is a FreeBSD7 system. From the man page of sio (the part that talks about flags):: ... 0x00080 use this port for remote kernel debugging ... Make sure you have this bit set. Regards, Navdeep > Two FreeBSD7 systems, target and development, connected with null > modem cable on each's COM1. > > step 1) >- rebuild kernel with following options: >options DDB >options KDB >options GDB > >makeoptions DEBUG=-g > > step 2) >- from development system >cd to /usr/src/sys/i386/comiple/MYKERNEL >kgdb -r /dev/cuad0 kernel.debug > >it displays the following: >Switching to remote protocol >Ignoring packet error, continuing >. >Couldn't establish connection to remote target >Malformed response to offset query, timeout > > step 3) >- from targetsystem: >1. Ctrl + Alt + Esc to go into db >2. from db> type gdb >3. it displays: "The remote GDB backend could not be selected" > > > > On Mon, Oct 6, 2008 at 5:12 PM, alan yang <[EMAIL PROTECTED]> wrote: >> the problem is, when entering gdb from db as described in the following: >> -- >> Enter ing gdb from ddb >> In FreeBSD you can build a kernel with support for both ddb and gdb. >> You can then >> change backwards and forwards between them. For example, if you're in >> ddb, you can >> go to gdb like this: >> db> gdb >> Next trap will enter GDB remote protocol mode >> db> si step a single instruction to reenter ddb >> -- >> after typing gdb command, it says: "The remote GDB backend could not >> be selected" >> that i am not sure what this indicates; looking at subr_kdb.c, wonder >> maybe kdb_dbbe_set is not set? seems kdb_dbbe_set is not referenced >> anywhere, not sure how to get it right. >> >> thanks for shed some light ... >> >> On Mon, Oct 6, 2008 at 4:26 PM, Pietro Cerutti <[EMAIL PROTECTED]> wrote: >>> -BEGIN PGP SIGNED MESSAGE- >>> Hash: SHA512 >>> >>> alan yang wrote: >>> | hi, there, >>> | >>> | wonder people can shed some lights on remote debugging. i have >>> | freebsd7 configured with option DDB / KDB / GDB but after entering the >>> | db on the target system the command gdb gives "the remote GDB backend >>> | could not be selected". >>> | >>> | i browsed through the mailing list, and do find 1 similar post but >>> | without answer. >>> | >>> | thanks in advance & apology if i overlooked things ... >>> >>> I suggest the following tutorial: >>> http://www.lemis.com/grog/Papers/Debug-tutorial/tutorial.pdf >>> >>> Have fun :) >>> >>> | >>> | cheers, >>> | alan >>> | ___ >>> | [EMAIL PROTECTED] mailing list >>> | http://lists.freebsd.org/mailman/listinfo/freebsd-hackers >>> | To unsubscribe, send any mail to "[EMAIL PROTECTED]" >>> >>> >>> - -- >>> Pietro Cerutti >>> [EMAIL PROTECTED] >>> >>> PGP Public Key: >>> http://gahr.ch/pgp >>> >>> -BEGIN PGP SIGNATURE- >>> Version: GnuPG v2.0.9 (FreeBSD) >>> >>> iEYEAREKAAYFAkjqnpQACgkQwMJqmJVx945RSwCgoDb0JTr8LSFDB1vpAbGUjb76 >>> ZH0An19HpFVJJTUB5/XnyZc0pIDzgxc3 >>> =6Pdm >>> -END PGP SIGNATURE- >>> >> > ___ > [EMAIL PROTECTED] mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "[EMAIL PROTECTED]" > ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: kgdb debugging
alan yang wrote: Could people shed some light how to get remote debugging going, must be something that i overlooked, really appreciate. Two FreeBSD7 systems, target and development, connected with null modem cable on each's COM1. step 1) - rebuild kernel with following options: options DDB options KDB options GDB makeoptions DEBUG=-g add hints.dev.uart.0.flags=0xc0 (or whatever it is) (see man uart or man sio) to /boot/device.hints step 2) - from development system cd to /usr/src/sys/i386/comiple/MYKERNEL kgdb -r /dev/cuad0 kernel.debug it displays the following: Switching to remote protocol Ignoring packet error, continuing . Couldn't establish connection to remote target Malformed response to offset query, timeout step 3) - from targetsystem: 1. Ctrl + Alt + Esc to go into db 2. from db> type gdb 3. it displays: "The remote GDB backend could not be selected" On Mon, Oct 6, 2008 at 5:12 PM, alan yang <[EMAIL PROTECTED]> wrote: the problem is, when entering gdb from db as described in the following: -- Enter ing gdb from ddb In FreeBSD you can build a kernel with support for both ddb and gdb. You can then change backwards and forwards between them. For example, if you're in ddb, you can go to gdb like this: db> gdb Next trap will enter GDB remote protocol mode db> si step a single instruction to reenter ddb -- after typing gdb command, it says: "The remote GDB backend could not be selected" that i am not sure what this indicates; looking at subr_kdb.c, wonder maybe kdb_dbbe_set is not set? seems kdb_dbbe_set is not referenced anywhere, not sure how to get it right. thanks for shed some light ... On Mon, Oct 6, 2008 at 4:26 PM, Pietro Cerutti <[EMAIL PROTECTED]> wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA512 alan yang wrote: | hi, there, | | wonder people can shed some lights on remote debugging. i have | freebsd7 configured with option DDB / KDB / GDB but after entering the | db on the target system the command gdb gives "the remote GDB backend | could not be selected". | | i browsed through the mailing list, and do find 1 similar post but | without answer. | | thanks in advance & apology if i overlooked things ... I suggest the following tutorial: http://www.lemis.com/grog/Papers/Debug-tutorial/tutorial.pdf Have fun :) | | cheers, | alan | ___ | [EMAIL PROTECTED] mailing list | http://lists.freebsd.org/mailman/listinfo/freebsd-hackers | To unsubscribe, send any mail to "[EMAIL PROTECTED]" - -- Pietro Cerutti [EMAIL PROTECTED] PGP Public Key: http://gahr.ch/pgp -BEGIN PGP SIGNATURE- Version: GnuPG v2.0.9 (FreeBSD) iEYEAREKAAYFAkjqnpQACgkQwMJqmJVx945RSwCgoDb0JTr8LSFDB1vpAbGUjb76 ZH0An19HpFVJJTUB5/XnyZc0pIDzgxc3 =6Pdm -END PGP SIGNATURE- ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]" ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: kgdb debugging
Could people shed some light how to get remote debugging going, must be something that i overlooked, really appreciate. Two FreeBSD7 systems, target and development, connected with null modem cable on each's COM1. step 1) - rebuild kernel with following options: options DDB options KDB options GDB makeoptions DEBUG=-g step 2) - from development system cd to /usr/src/sys/i386/comiple/MYKERNEL kgdb -r /dev/cuad0 kernel.debug it displays the following: Switching to remote protocol Ignoring packet error, continuing . Couldn't establish connection to remote target Malformed response to offset query, timeout step 3) - from targetsystem: 1. Ctrl + Alt + Esc to go into db 2. from db> type gdb 3. it displays: "The remote GDB backend could not be selected" On Mon, Oct 6, 2008 at 5:12 PM, alan yang <[EMAIL PROTECTED]> wrote: > the problem is, when entering gdb from db as described in the following: > -- > Enter ing gdb from ddb > In FreeBSD you can build a kernel with support for both ddb and gdb. > You can then > change backwards and forwards between them. For example, if you're in > ddb, you can > go to gdb like this: > db> gdb > Next trap will enter GDB remote protocol mode > db> si step a single instruction to reenter ddb > -- > after typing gdb command, it says: "The remote GDB backend could not > be selected" > that i am not sure what this indicates; looking at subr_kdb.c, wonder > maybe kdb_dbbe_set is not set? seems kdb_dbbe_set is not referenced > anywhere, not sure how to get it right. > > thanks for shed some light ... > > On Mon, Oct 6, 2008 at 4:26 PM, Pietro Cerutti <[EMAIL PROTECTED]> wrote: >> -BEGIN PGP SIGNED MESSAGE- >> Hash: SHA512 >> >> alan yang wrote: >> | hi, there, >> | >> | wonder people can shed some lights on remote debugging. i have >> | freebsd7 configured with option DDB / KDB / GDB but after entering the >> | db on the target system the command gdb gives "the remote GDB backend >> | could not be selected". >> | >> | i browsed through the mailing list, and do find 1 similar post but >> | without answer. >> | >> | thanks in advance & apology if i overlooked things ... >> >> I suggest the following tutorial: >> http://www.lemis.com/grog/Papers/Debug-tutorial/tutorial.pdf >> >> Have fun :) >> >> | >> | cheers, >> | alan >> | ___ >> | [EMAIL PROTECTED] mailing list >> | http://lists.freebsd.org/mailman/listinfo/freebsd-hackers >> | To unsubscribe, send any mail to "[EMAIL PROTECTED]" >> >> >> - -- >> Pietro Cerutti >> [EMAIL PROTECTED] >> >> PGP Public Key: >> http://gahr.ch/pgp >> >> -BEGIN PGP SIGNATURE- >> Version: GnuPG v2.0.9 (FreeBSD) >> >> iEYEAREKAAYFAkjqnpQACgkQwMJqmJVx945RSwCgoDb0JTr8LSFDB1vpAbGUjb76 >> ZH0An19HpFVJJTUB5/XnyZc0pIDzgxc3 >> =6Pdm >> -END PGP SIGNATURE- >> > ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
Re: kgdb debugging
-BEGIN PGP SIGNED MESSAGE- Hash: SHA512 alan yang wrote: | hi, there, | | wonder people can shed some lights on remote debugging. i have | freebsd7 configured with option DDB / KDB / GDB but after entering the | db on the target system the command gdb gives "the remote GDB backend | could not be selected". | | i browsed through the mailing list, and do find 1 similar post but | without answer. | | thanks in advance & apology if i overlooked things ... I suggest the following tutorial: http://www.lemis.com/grog/Papers/Debug-tutorial/tutorial.pdf Have fun :) | | cheers, | alan | ___ | [EMAIL PROTECTED] mailing list | http://lists.freebsd.org/mailman/listinfo/freebsd-hackers | To unsubscribe, send any mail to "[EMAIL PROTECTED]" - -- Pietro Cerutti [EMAIL PROTECTED] PGP Public Key: http://gahr.ch/pgp -BEGIN PGP SIGNATURE- Version: GnuPG v2.0.9 (FreeBSD) iEYEAREKAAYFAkjqnpQACgkQwMJqmJVx945RSwCgoDb0JTr8LSFDB1vpAbGUjb76 ZH0An19HpFVJJTUB5/XnyZc0pIDzgxc3 =6Pdm -END PGP SIGNATURE- ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
kgdb debugging
hi, there, wonder people can shed some lights on remote debugging. i have freebsd7 configured with option DDB / KDB / GDB but after entering the db on the target system the command gdb gives "the remote GDB backend could not be selected". i browsed through the mailing list, and do find 1 similar post but without answer. thanks in advance & apology if i overlooked things ... cheers, alan ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
