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GDB from ESD on a shoe string

Hello All and Lewin,

I have purchased Lewins book, Embedded Systems Design.

I loaded the GNU/GCC compiler, everything seems to work as described.

I tried out the demo programs, and I get an .elf file as described.

I tried to run GDB, no joy.

As per the book ( page 159 ), I enter the command:

"target rdi /dev/ttyS0" and it gives me "Could not open device "/dev/ttyS0"".

The serial port works and I can see the Angle monitor on the screen. ( using Teraterm)

How do I fix this ?????

Google shows that this probem is not new, but does not give any advice on how to fix it.

My system is Win2K. ( yes, I closed Teraterm first )

Thanks

Reply to
strudy
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Try "target rdi COM1" or "target rdi COM2"

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Grant Edwards                   grante             Yow!  Yow! I want my nose
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Reply to
Grant Edwards

Reply to
strudy

Hi Grant,

Can you give any ideas why this would happen on SOME systems, and not others?

During the final edits, I went through the book and tried everything - line by line - on Cygwin as well as Linux, to avoid embarrassing (to me) postings like this one. I thought I had weeded out such errors. Is it possible that the underlying Windows environment affects how the serial ports are accessible? Or did I just miss something (maybe I instinctively used com1 instead of /dev/ttyS0 when I tested on Windows).

My test environment was Windows XP logged in as Administrator.

Reply to
Lewin A.R.W. Edwards

Lewin,

I could not get the package to compile on my XP box.

I went to 2K just because it was there next to me.

Your book has got me off the fence as far as GCC is concerned.

I have been downloading all kinds of versions that "should" work on WinXX machines, but they never do. This is the first time I have seen, first hand, any version of GCC working.

Thanks for a great starter book. ( starting over again after 20 years of embedded work )

Thanks

Lew> Hi Grant,

Reply to
strudy

/dev/ttyS0 doesn't work for me either on win2k. If I try target rdi com1, I see the serial port led(s) flash and then it hangs. I still haven't been able to get gdb to talk to the angel debug monitor on the eb40a board. I do not have hotsync etc running either. If I reset the board with hyperterm turned on I see angel sending out stuff including "Angel Debug Monitor" and "EB40A" strings plus some binary. Also, I did execute the remotebaud command with 9600 baud.

I've read Lewin's book and it is excellent. I think the problem is with gdb. Is there a fix for it?

thanks, William

Reply to
William Wuister

Hi,

This is really strange. I think you emailed me, and I responded to that email, but for the benefit of people who are reading cae I'll summarize what I believe to be the "important" points of my test XP system:

  • Windows XP Professional with no service packs, single NTFS volume(+)
  • Via Epia motherboard, 256Mb RAM, 800MHz C3 processor, one serial port on motherboard
  • Logged in as Administrator (Not as a user with administrative privileges, but actually as Administrator)
  • Cygwin installed to c:\cygwin

(+) - This can make a difference.

This is pretty much why I wrote the book. All the references I could find just didn't work for me.

Glad you found the book useful, though.

Reply to
Lewin A.R.W. Edwards

No service packs is your problem. Sp1 is usual minimum install + latest secuirty patches.

Also logged in as Admin could be a problem as well. Its not always possible to get access to log in as admin.

Got a copy of your book as well. Had a quick browse and looks quite good. Haven't had the time to go through it thoroughly yet.

Thanks

Alex Gibson

Reply to
Alex Gibson

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