Re: [ECOS] Problem with GDB over /dev/ttyS0

Re: [ECOS] Problem with GDB over /dev/ttyS0

[Jonathan Larmour]

[ Please keep ecos-discuss CC'd, so everyone has the benefit of replies ]

jyl087@netscape.net wrote:
> 
> Jonathan Larmour <jlarmour@redhat.com> wrote:
> 
> >jyl087@netscape.net wrote:
> >> Help..., I'm can't connect to my remote EDB7312 via the serial GDB
> >> interface. The host is Linux 7.2, running GDB 5.1.1. The target is
> >> the latest eCos, running on a EDB7312 board with RedBoot installed
> >> in Flash.
> >>
> >> The strange thing is that I can connect to the remote host via TCP:9000.
> >> Also, I can "cu" and "minicom" connect to the target to talk to the
> >> Redboot prompt. I can even connect to the target via /dev/ttyS0 when
> >> running Angel in the ROM and using "target rdi"!  However, when I
> >> use "target remote /dev/ttyS0", gdb just hangs. Also hangs when I use
> >> the Insight GUI. I've made sure to use "set remotebaud 38400" to match
> >> the setup of my board.
> >
> >If you use minicom and type something like:
> >++$g#67
> >
> >do you see anything?
> 
> I see:
>    $01000000010000002c4600005000000003000000500000000000000001000000ac46000000000000

Well that does look vaguely sensible in principle. In that case try GDB
again and do "set remotedebug 1" (or "set debug remote 1" in more recent
GDBs) before doing the target remote.
 
> The "port" is my own EDB7312 based on EDB7xxx. Probably broken somehow.
> Does the fact that running the code via GDB is faster than running
> directly from RedBoot give a clue to the problem?

Can't see any obvious link.

Worst case is that there is a 7312 port to be released in v2.

Jifl
-- 
Red Hat, Rustat House, Clifton Road, Cambridge, UK. Tel: +44 (1223) 271062
Maybe this world is another planet's Hell -Aldous Huxley || Opinions==mine

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Re: [ECOS] Problem with GDB over /dev/ttyS0

[Jonathan Larmour]

jyl087@netscape.net wrote:
> 
> Jonathan Larmour <jlarmour@redhat.com> wrote:
> >jyl087@netscape.net wrote:
> >> Jonathan Larmour <jlarmour@redhat.com> wrote:
> >> >jyl087@netscape.net wrote:
> >> >> Help..., I'm can't connect to my remote EDB7312 via the serial GDB
> >> >> interface. The host is Linux 7.2, running GDB 5.1.1. The target is
> >> >> the latest eCos, running on a EDB7312 board with RedBoot installed
> >> >> in Flash.
> >>    $01000000010000002c4600005000000003000000500000000000000001000000ac46000000000000
> >
> >Well that does look vaguely sensible in principle. In that case try GDB
> >again and do "set remotedebug 1" (or "set debug remote 1" in more recent
> >GDBs) before doing the target remote.
> 
> THAT WORKED!  Thanks!

Worked?! It shouldn't have changed anything except to output some debug
info! Weird. Sounds like some sort of timing bug if this fixes it (which
potentially relates to other problems you've seen.
 
> By the way, is it possible to get information about eCos threads in
> GDB-Insight?  Insight gives me an error when I invoke "View->Thread-list".
> Perhaps it's my GDB/Redboot stub that's somehow broken?

It must be because this normally works.

Jifl
-- 
Red Hat, Rustat House, Clifton Road, Cambridge, UK. Tel: +44 (1223) 271062
Maybe this world is another planet's Hell -Aldous Huxley || Opinions==mine

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Before posting, please read the FAQ: http://sources.redhat.com/fom/ecos
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Re: [ECOS] Problem with GDB over /dev/ttyS0

[Jonathan Larmour]

jyl087@netscape.net wrote:
> 
> Hi,
> 
> Help..., I'm can't connect to my remote EDB7312 via the serial GDB
> interface. The host is Linux 7.2, running GDB 5.1.1. The target is
> the latest eCos, running on a EDB7312 board with RedBoot installed
> in Flash.
> 
> The strange thing is that I can connect to the remote host via TCP:9000.
> Also, I can "cu" and "minicom" connect to the target to talk to the
> Redboot prompt. I can even connect to the target via /dev/ttyS0 when
> running Angel in the ROM and using "target rdi"!  However, when I
> use "target remote /dev/ttyS0", gdb just hangs. Also hangs when I use
> the Insight GUI. I've made sure to use "set remotebaud 38400" to match
> the setup of my board.

If you use minicom and type something like:
++$g#67

do you see anything?
 
> Another odd thing... when the gdb is hung after issuing the "target
> remote" command, I can open another xterm window and "cu -l /dev/ttyS0 dir" and get the port. This obviously means that gdb hasn't even
> opened the serial port.
> 
> Any ideas on what I'm doing wrong?

Do you have read/write access to /dev/ttyS0? Perhaps GDB isn't reporting an
error.
 
> Also, another oddity about eCos. I can download a test program via the
> remote/TCP connection and execute it normally. However, when I download
> my test program using the RedBoot monitor and TFTP, I get a different
> result. Using a terminal emulator connected direcly to the board, I
> type "load..." and then "jump start"... The test program runs very
> slooooowly.   What's different about running the target directly from
> the hardware vs. over GDB?

Perhaps the port you are using isn't complete e.g. code sometimes requests
delays sometimes, and if the port didn't set things up right for the clock
speed, this might cause your problems.

Jifl
-- 
Red Hat, Rustat House, Clifton Road, Cambridge, UK. Tel: +44 (1223) 271062
Maybe this world is another planet's Hell -Aldous Huxley || Opinions==mine

-- 
Before posting, please read the FAQ: http://sources.redhat.com/fom/ecos
and search the list archive: http://sources.redhat.com/ml/ecos-discuss

[ECOS] Problem with GDB over /dev/ttyS0

[jyl087]

Hi,

Help..., I'm can't connect to my remote EDB7312 via the serial GDB
interface. The host is Linux 7.2, running GDB 5.1.1. The target is
the latest eCos, running on a EDB7312 board with RedBoot installed
in Flash.

The strange thing is that I can connect to the remote host via TCP:9000.
Also, I can "cu" and "minicom" connect to the target to talk to the
Redboot prompt. I can even connect to the target via /dev/ttyS0 when
running Angel in the ROM and using "target rdi"!  However, when I
use "target remote /dev/ttyS0", gdb just hangs. Also hangs when I use
the Insight GUI. I've made sure to use "set remotebaud 38400" to match
the setup of my board.

Another odd thing... when the gdb is hung after issuing the "target 
remote" command, I can open another xterm window and "cu -l /dev/ttyS0 dir" and get the port. This obviously means that gdb hasn't even 
opened the serial port.

Any ideas on what I'm doing wrong?

Also, another oddity about eCos. I can download a test program via the
remote/TCP connection and execute it normally. However, when I download 
my test program using the RedBoot monitor and TFTP, I get a different
result. Using a terminal emulator connected direcly to the board, I
type "load..." and then "jump start"... The test program runs very 
slooooowly.   What's different about running the target directly from
the hardware vs. over GDB?

Thanks for your help.
Best,
/Jim

-- 




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Before posting, please read the FAQ: http://sources.redhat.com/fom/ecos
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