[GSoC - x86_64] Console / serial communication

[Amaan Cheval]

Since we skipped our meeting today, here's a quick screengrab of UART
working with -serial stdio on QEMU (just inb/outb instructions
directly, without termios or ns16550):
https://i.imgur.com/tumtD3Z.png

On Wed, Jun 27, 2018 at 10:56 AM, Amaan Cheval <amaan.cheval at gmail.com> wrote:
> Brilliant, thank you for the quick response and clarification!
>
> On Wed, Jun 27, 2018 at 10:51 AM, Sebastian Huber
> <sebastian.huber at embedded-brains.de> wrote:
>> On 27/06/18 06:59, Amaan Cheval wrote:
>>>
>>> Quick question since the BSP guide is outdated - I see several
>>> "methods" of RTEMS' console management. The guide says to use
>>> console-termios.c (and rtems_termios_device_install) as the "new"
>>> method.
>>>
>>> https://docs.rtems.org/branches/master/bsp-howto/console.html#build-system-and-files
>>
>>
>> The console driver documentation in the BSP guide is up to date.
>>
>>>
>>> Most BSPs (beagle, pc386, malta) using NS16550 use legacy-console.c,
>>> though - are NS16550 and Termios mutually exclusive for now?
>>>
>>> Or is it simply that none of the old NS16550 users have been ported
>>> over to using console-termios.c as well?
>>>
>>> What would be the expectation from a new BSP?
>>
>>
>> Definitely use rtems_termios_device_install() in new BSPs. There is a
>> NS16550 driver variant for this new interface:
>>
>> bsps/shared/dev/serial/ns16550-context.c
>>
>> In <libchip/ns16550.h>:
>>
>> extern const rtems_termios_device_handler ns16550_handler_interrupt;
>> extern const rtems_termios_device_handler ns16550_handler_polled;
>> extern const rtems_termios_device_handler ns16550_handler_task;
>>
>> extern const rtems_termios_device_flow ns16550_flow_rtscts;
>> extern const rtems_termios_device_flow ns16550_flow_dtrcts;
>>
>> void ns16550_polled_putchar(rtems_termios_device_context *base, char out);
>>
>> int ns16550_polled_getchar(rtems_termios_device_context *base);
>>
>> bool ns16550_probe(rtems_termios_device_context *base);
>>
>> --
>> Sebastian Huber, embedded brains GmbH
>>
>> Address : Dornierstr. 4, D-82178 Puchheim, Germany
>> Phone   : +49 89 189 47 41-16
>> Fax     : +49 89 189 47 41-09
>> E-Mail  : sebastian.huber at embedded-brains.de
>> PGP     : Public key available on request.
>>
>> Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.
>>