[ECOS] RedBoot, GDB_STUB and serial interrupts
Tue Jan 29 17:38:00 GMT 2002
Chris Zankel wrote:
> I am currently in the process of porting RedBoot to a new
Xtensa support would be neat!
> In one of the mails mentione above Gary Thomas wrote:
> You should _not_ have the options required to include this
> code set. The options CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT
> and CYGDBG_HAL_DEBUG_GDB_CTRLC_SUPPORT should only be enabled
> for "normal" eCos applications.
Well, I think what Gary was thinking was that
CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT is enabled but has little effect. See
> But because BREAK_SUPPORT is now enabled hal_ctrlc_isr_init()
> is also compiled and enables the interrupt for the serial port:
> // We can only enable interrupts on a valid debug channel.
> if (__chan)
> CYGACC_COMM_IF_CONTROL(*__chan, __COMMCTL_IRQ_ENABLE);
> This effecively disables debugging in RedBoot because the
> interrupt routine only checks for a ctrl-c character and
> dismisses all other characters.
For a start that stuff in hal_ctrlc_isr_init is #ifndef
CYGSEM_HAL_ROM_MONITOR, which a ROM redboot defines.
But in any case, RedBoot runs with interrupts disabled always. Everything
is done by polling.
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