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<
thunderbolt_ >
Hello everybody. I got myself a FT2232H breakout board and UrJTAG. How can I debug my LM32 (using GDB?). Any help is welcome.
09:17
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thunderbolt_ >
Environment is a Spartan 6 running a self-ported LM32
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sb0 >
best is use the serial gdb stub
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thunderbolt_ >
sb0, Hi. What do you mean when you say "stub"?
11:27
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GitHub124 >
migen/master 4d38232 Sebastien Bourdeauducq: mibuild/xilinx: share more code between ISE and Vivado, use special overrides with Vivado, merge xilinx_tools into xilinx_common
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thunderbolt_ >
sb0, so that code I need to compile/link in to my program?
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sb0 >
no, you need to put it into a rom
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thunderbolt_ >
I see, so this is a standalone program for the LM32 and the program gets uploaded through GDB?
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sb0 >
I'm not sure if you can upload programs through that, never tried
11:34
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thunderbolt_ >
but how can you get the debugger to step through your own code?
11:35
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sb0 >
the way I used it is load the program through some other means, then use gdb on the corresponding elf binary with debug symbols on the host, and attach via serial break
11:35
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sb0 >
of course this won't work if you want to set a breakpoint e.g. on main()
11:38
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sb0 >
it's for the jtag, but we're not using that - according to mwalle openocd is full of bugs
11:39
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GitHub134 >
misoc/master d1ff43f Florent Kermarrec: gensoc/cpuif: do not generate access functions for registers > 64 bits
11:39
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GitHub134 >
misoc/master 37968e6 Sebastien Bourdeauducq: targets/kc705: use PLL for clocking
11:39
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GitHub134 >
misoc/master ca6d695 Sebastien Bourdeauducq: targets/ppro: use migen reset synchronizer
11:40
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GitHub82 >
migen/master b124a98 Sebastien Bourdeauducq: genlib: add reset synchronizer
11:40
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thunderbolt_ >
Okay so serial it the way to go
11:42
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thunderbolt_ >
sb0, I don't quite get it... if I make the LM32 start at the ROM location of the GDB stub - where do I put my program to debug?
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sb0 >
you can put it anywhere, lm32 will only jump to the rom when its external break signal (which you connect to the uart) is asserted
11:59
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sb0 >
if you end up using this thing, I'd recommend you port it to misoc and send a patch :)
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sb0 >
what you need for that is 1) add break detection to the UART 2) do a couple changes in the stub to adapt to the new UART
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thunderbolt_ >
Okay now I get it. Thank you guys very much!
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GitHub180 >
migen/master 7ebf08d Sebastien Bourdeauducq: mibuild/xilinx: connect CE on reset synchronizer FFs
15:55
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GitHub115 >
misoc/master efb2466 Sebastien Bourdeauducq: gensoc: add id for KC705
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GitHub115 >
misoc/master fb48b89 Sebastien Bourdeauducq: platforms/kc705: generate clocks for SDRAM
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GitHub133 >
migen/master 5fb221e Sebastien Bourdeauducq: typo
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