[ECOS] bootloader into the gdb_module stabs

[ECOS] bootloader into the gdb_module stabs

[Hansjörg Petriffer]

Hello 

I'm searching at the moment the part with the bootloader which loads the
programm over the serial connection. But my problem is that I can't find the
part that does that. I have found the cyg_start, which I think is the entry
point, but I'm not sure how it works. Could anyone help me? Is there any
description available for that part, where I can find? I need that, because
I will test a few things with a own bootloader.

Thanks for any hint!

Re: [ECOS] bootloader into the gdb_module stabs

[Jonathan Larmour]

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Hansjörg Petriffer wrote:
> 
> Hello
> 
> I'm searching at the moment the part with the bootloader which loads the
> programm over the serial connection. But my problem is that I can't find the
> part that does that. I have found the cyg_start, which I think is the entry
> point, but I'm not sure how it works. Could anyone help me? Is there any
> description available for that part, where I can find? I need that, because
> I will test a few things with a own bootloader.
> 
> Thanks for any hint!

In general, the program in the stub image deliberately hits a breakpoint
instruction (see hal/common/current/src/stubrom/stubrom.c for an example).
This causes an exception. eCos arranged for the built-in GDB stubs to
handle the exception that was generated, so that causes the stub code to be
entered. The stub then listens on the serial line for communication with
GDB (including, for example, memory write commands that will cause the
program to be loaded).

Jifl
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