I want to debug the kernel module loaded in the x86_64 (jasperforest) linux-yocto target, so I load the 'vmlinux' with gdb on the host PC (CentOS 6.4_x64) , but looks like the gdb failed to connect the target, should I add any 'kernel boot parameters' to enable the kgdb use ttyS0 ?
my target boot from a USB drive with SYSLINUX, the target's ttyS0 is used as console output, should I use ttyS1 on target as debug port instead of ttyS0? how can I set that? and , when I run "echo g > /proc/sysrq-trigger" on target console, the target machine not freeze as expect. ---------------------------------------------------------------------------------------------------------------------- [root@localhost linux-jasperforest-standard-build]# x86_64-poky-linux-gdb vmlinux GNU gdb (GDB) 7.5 Copyright (C) 2012 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html > This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "--host=x86_64-pokysdk-linux --target=x86_64-poky-linux". For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>... Reading symbols fromtmp/work/jasperforest-poky-linux/linux-yocto/3.4.26+gitAUTOINC+4fd76cc4f33e0afd8f906b1e8f231b6d13b6c993_840bb8c059418c4753415df56c9aff1c0d5354c8-r4.3/linux-jasperforest-standard-build/vmlinux...done. (gdb) target remote /dev/ttyS0 Remote debugging using /dev/ttyS0 Ignoring packet error, continuing... warning: unrecognized item "qRelocInsn+���b5" in "qSupported" response Ignoring packet error, continuing... Ignoring packet error, continuing... Ignoring packet error, continuing... Ignoring packet error, continuing... Ignoring packet error, continuing... Ignoring packet error, continuing... Malformed response to offset query, qOffsets���4bftiprocess (gdb)
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