RE: [ECOS] Re: Romboot in i386 (continued) - comms. problems

["Alex Lennon" <ajlennon@arcom.co.uk>]

>>Why? Just enable the FIFOs and leave it at that. If interrupts are
>>disabled, the HAL code won't notice any difference.

Right. Thanks - the 16550 I'm using for test downloads fine at 38400
with FIFOs on (after a couple of initial packet timeouts ?)

I'd like to get the debug link going as quickly as possible eventually
and I can't see 115200 working with this setup. I'd still like to put the
ISR code together.

Also, as I'm using a 386EX I have two 16450's which I'd like the option
to use for debugging purposes - again, I'd need interrupt driven comms.

I'm still trying to understand what the problem is here with an interrupt
driven implementation. Is polled mode for Redboot a design decision? 
If so is there somewhere I can look for the background ?

Further down the line we're looking to put together an Ethernet driver
for the RTL8019, to eliminate all of the serial comms bottlenecking.
I take it that there is some level of interrupt support in Redboot for
this purpose ?

On a slightly different note, after the successful download of the
'hello' example the target seems to lock (I'm using Insight). I'd
like to see where this happens but I can't see a way to make
Insight/GDB breakpoint prior to execution of the first instruction.
Is there an obvious way of doing this which I'm just missing ?

Thanks,

 Alex



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