* Re: [Qemu-devel] About QEMU for MIPS
2013-10-29 18:43 ` Antony Pavlov
@ 2013-10-30 9:57 ` Nancy
0 siblings, 0 replies; 3+ messages in thread
From: Nancy @ 2013-10-30 9:57 UTC (permalink / raw)
To: Antony Pavlov; +Cc: qemu-devel
On Wed, Oct 30, 2013 at 2:43 AM, Antony Pavlov <antonynpavlov@gmail.com> wrote:
> On Tue, 29 Oct 2013 21:09:30 +0800
> Nancy <nancydreaming@gmail.com> wrote:
>
> Some years ago I have made a set of scripts for building MIPS linux kernel and
> rootfs from scratch and running it under qemu.
> See https://github.com/frantony/clab for details,
> especialy see start-qemu.sh script and files in the qemu-configs/malta-linux-gnu
> subdirectory.
>
> Also see a versatile 'buildroot' software for easy rootfs creation (www.buildroot.org).
Wow, what a good Idea to create this tool! That will save people's time!
I have ran:
$./mk_src_dir.sh
$./build-all.sh
MKDIR config.gen
IN config.gen/arch.in
IN config.gen/kernel.in
IN config.gen/cc.in
IN config.gen/libc.in
IN config.gen/debug.in
CONF config/config.in
run_with_check: ./ct-ng build.24
[INFO ] Performing some trivial sanity checks
[INFO ] Build started 20131030.171948
[INFO ] Building environment variables
[EXTRA] Preparing working directories
[ERROR]
[ERROR] >>
[ERROR] >> Error happened in: CT_DoExecLog[scripts/functions]
[ERROR] >> called from: main[scripts/crosstool-NG.sh@235]
[ERROR] >>
[ERROR] >> For more info on this error, look at the file: 'build.log'
[ERROR] >> There is a list of known issues, some with workarounds, in:
[ERROR] >> 'docs/B - Known issues.txt'
[ERROR]
[ERROR] Build failed in step 'Dumping user-supplied crosstool-NG
configuration'
[ERROR]
[ERROR] (elapsed: 0:00.18)
[00:00] / make[1]: *** [build] Error 1
make: *** [build.24] Error 2
fail: ./ct-ng build.24
>> 1. When QEMU for MIPS support watchpoint debug facility? Any hint or guide
>> to implement that function?
>
> Run qemu with -S and -s options. Next start your cross gdb (e.g. mips-linux-gdb),
> next in the gdb cmdline use command "target remote :1234" to connect to qemu.
Thank you very much! I did not use cross gdb so I got wrong, then I
saw the QEMU internal paper, it says current MIPS limitation do not
implement watchpoint debug facility, I though it was QEMU bug. So
give up QEMU internal gdb try.
Now it work with cross gdb, Thank you very much Sir :-)
By the way, do you know how to compile linux kernel with -O0 option to
forbid gdb pointer jump back and forth...
>> 2. qemu-system-mipsel -M malta -kernel vmlinux-2.6.26-1-4kc-malta -hda
>> debian_lenny_mipsel_small.qcow2 -append "root=/dev/hda1 console=ttyS0
>> kgdboc=ttyS0,115200 kgdbwait" -nographic -serial tcp::1234,server -net
>> nic,model=pcnet -net user
>>
>> Did I miss something? I cannot see the bootup message in the current client
>> unless I remove "-serial tcp::1234,server" away. But I need that for kgdb
>> debug. What is the right way to configure it?
>
> Do you really need this "in-kernel" gdb support? As I have already write,
> qemu itself has gdb server functionality support.
Though maybe I do not use kgdb, I still want to know the right way to
configure it ;-)
--
Best Regards,
Yu Rong Tan
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