Date: Tue, 10 May 2011 10:31:14 -0500 From: Erik Moe <ehmoeok@gmail.com> To: freebsd-mips@freebsd.org Subject: Remote debugging RB133c Message-ID: <034B1706-6E5A-41C6-988F-D4B3C911D840@gmail.com>
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Me again,
I'm trying to do some remote debugging on the RB133c. I can get the =
kernel to boot over tftp. I've added the following option to the =
ADM5120 kernel config:
makeoptions DEBUG=3D-g=20
options DDB
options KDB
options GDB
options BREAK_TO_DEBUGGER
I've also built a cross-debugger:
export SRCROOT=3D/home/emoe/svn/mips
export TARGET_ARCH=3Dmipsel
cd ${SRCROOT}/gnu/usr.bin/binutils &&
make depend all &&
cd ../gdb &&
make depend all &&
cd gdb &&
make install &&
cd ../kgdb &&
make install
I've locked my serial port at 115200 baud:
# stty -f /dev/cuaU0.init speed 115200
# stty -f /dev/cuaU0.lock 1
I connect to the serial port on the RB133c using screen and boot the =
kernel:
# screen /dev/cuaU0
RouterBOOT booter 2.18
RouterBoard 133C3
CPU frequency: 175 MHz
Memory size: 16 MB
Press any key within 6 seconds to enter setup......
trying dhcp protocol... OK
resolved mac address 00:0C:29:29:27:66
Gateway: 192.168.11.1
transfer started ......................... transfer ok, time=3D5.07s
setting up elf image... OK
jumping to kernel code
entry: mips_init()
Cache info:
picache_stride =3D 4096
picache_loopcount =3D 2
pdcache_stride =3D 4096
pdcache_loopcount =3D 2
cpu0: MIPS Technologies processor v11.128
MMU: Standard TLB, 16 entries
L1 i-cache: 2 ways of 256 sets, 16 bytes per line
L1 d-cache: 2 ways of 256 sets, 16 bytes per line
Config1=3D0x1e994c8a<WatchRegs,EJTAG>
Physical memory chunk(s):
0x29c000 - 0xffffff, 14041088 bytes (3428 pages)
Maxmem is 0x1000000
GDB: debug ports: uart
GDB: current port: uart
KDB: debugger backends: ddb gdb
KDB: current backend: ddb
Copyright (c) 1992-2011 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
The Regents of the University of California. All rights =
reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 9.0-CURRENT #9 r221418M: Sun May 8 20:20:54 CDT 2011
=
root@freebsd.localdomain:/usr/home/emoe/obj/mips/mips.mipsel/usr/home/emoe=
/svn/mips/sys/ADM5120 mips
real memory =3D 16777216 (16384K bytes)
Physical memory chunk(s):
0x00328000 - 0x00f8dfff, 13000704 bytes (3174 pages)
avail memory =3D 12746752 (12MB)
nfslock: pseudo-device
mem: <memory>
null: <null device, zero device>
nexus0: <MIPS32 root nexus>
clock0: <Generic MIPS32 ticker> on nexus0
Timecounter "MIPS32" frequency 175000000 Hz quality 800
Event timer "MIPS32" frequency 175000000 Hz quality 800
obio0 at mem 0-0x1ffffffe on nexus0
admsw0: <ADM5120 Switch Engine> on obio0
admsw0: ADM5120 Switch Engine, 6 ports
admsw0: base Ethernet address 00:0c:42:07:b2:4e
admsw0: Ethernet address: 00:0c:42:07:b2:4e
admsw1: Ethernet address: 00:0c:42:07:b2:4f
admsw2: Ethernet address: 00:0c:42:07:b2:50
admsw3: Ethernet address: 00:0c:42:07:b2:51
admsw4: Ethernet address: 00:0c:42:07:b2:52
admsw5: Ethernet address: 00:0c:42:07:b2:53
uart0: <adm5120_uart, channel A> on obio0
uart0: fast interrupt
uart0: console (115200,n,8,1)
Device configuration finished.
Timecounters tick every 10.000 msec
bootpc_init: wired to interface 'admsw0'
Sending DHCP Discover packet from interface admsw0 (00:0c:42:07:b2:4e)
DHCP/BOOTP timeout for server 255.255.255.255
DHCP/BOOTP timeout for server 255.255.255.255
DHCP/BOOTP timeout for server 255.255.255.255
DHCP/BOOTP timeout for server 255.255.255.255
DHCP/BOOTP timeout for server 255.255.255.255
=20
Within screen, I can send a BREAK (ctrl-a b) and drop into DDB and =
invoke the GDB backend.
KDB: enter: Line break on console
[ thread pid 10 tid 100002 ]
Stopped at kdb_enter+0x4c: lui at,0x8029
db> gdb
(ctrl-c will return control to ddb)
Switching to gdb back-end
$T0525:78dc0b80;thread:186a2;#e4
Then I can exit screen (ctrl-a K) and invoke kgdb-mipsel, but I'm seeing =
a lot of "Ignoring packet error", "Reply contains invalid hex digit 116" =
errors and it doesn't seem to be functioning.
# kgdb-mipsel -r /dev/cuaU0 /home/emoe/tftpboot/boot/kernel/kernel
GNU gdb 6.1.1 [FreeBSD]
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you =
are
welcome to change it and/or distribute copies of it under certain =
conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for =
details.
This GDB was configured as "--host=3Di386-marcel-freebsd =
--target=3Dmipsel-marcel-freebsd"...Switching to remote protocol
kdb_enter (why=3D0x801f1eac "break", Ignoring packet error, =
continuing...
msg=3DReply contains invalid hex digit 116
)
at /usr/home/emoe/svn/mips/sys/kern/subr_kdb.c:336
336 kdb_why =3D KDB_WHY_UNSET;
Ignoring packet error, continuing...
(kgdb) break admsw_start
Ignoring packet error, continuing...
Reply contains invalid hex digit 116
(kgdb) continue
Continuing.
Ignoring packet error, continuing...
It could very well be I don't know what I'm doing, but has anyone had =
success?
Thanks,
Erik
=20=
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