GDB stub for RAM startup.

[Jonathan Larmour]

Sorry for the long delay, but in case it helps...

Ottawa Guy wrote:
> Hi,
> I am using sparc leon board. This board comes with
> serial port, PCI interface and DSU software.
> 
> Using the DSU software I can download an "elf" file
> into the board's memory and reset the PC to start
> executing. All I want is to use the serial port for
> debug (gdb). 
> 
> I have ported the CYGINT_HAL_VIRTUAL_VECTOR_SUPPORT.
> So that I could configure the serial port.
> 
> I have the following question.
> 
> 1. My application is only "RAM" startup. Do I need
> include  "ROM-MONITOR" package or REDBOOT package

It depends exactly what you want to achieve. You could port RedBoot, which 
generally isn't difficult if you've already got eCos going. Or you could 
include GDB stubs directly in your application by using 
CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS. But you'll still need to do something 
like make an explicit call to breakpoint(), or add ctrl-c support (called 
"break" support when stubs are included) in order for control to be passed 
to your application for debug.

> 2. In the platform specific *.cdl file . I have the
> following 
> 
>   cdl_option CYGBLD_BUILD_GDB_STUBS {
>             display "Build GDB stub RAM image"
>             default_value 0
>             requires { CYG_HAL_STARTUP == "RAM" }
>             requires
> CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS
>            }
> 
> Do I need anything else under the "Required" claused. 

Off the top of my head, I can't think of any as 
CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS has its own set of requirements that 
should make it do the right thing.

> 3. What is  "CYGINT_HAL_DEBUG_GDB_STUBS_BREAK"

The ability to listen for a ctrl-c on the GDB channel, interrupt the 
running program, and drop into the GDB stub.

Jifl
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