Hi Martin,
I replied earlier to the list but I guess I messed it up a bit. Your tip on the
polling turned out to be really helpful. I basically changed the type of
serial_esc in kernel/fiasco/src/kern/config.cpp from SERIAL_ESC_IRQ to
SERIAL_ESC_NOIRQ and it works! It would be great if you can elaborate on the
difference (I am guessing the latter uses a poll based system but more
explanation would be great).
I was even able to run l4 and fiasco on the actual SCC hardware and get the
UART RX to work. So thanks a ton for the tip! :)
Best,
Ramya
________________________________________
From: Martin Schröder [mschroe...@web.de]
Sent: 29 August 2014 23:23
To: Masti Ramya Jayaram; l4-hackers@os.inf.tu-dresden.de
Subject: Re: Minimal requirements to run L4linux using only a serial console
Hi Ramya,
Tx path of UART is working but the Rx part not due to missing
interrupts. In the Tx part interrupts are not really required - alt
least not for Hello World. I also don't care about the missing "H" right
now. So the first step would be polling the fiasco UART every 100ms or
so instead of waitung for interrupts.
Best regards,
Martin
I don't care abount the missing "H", this could be anything.
Am 29.08.2014 17:45, Masti Ramya Jayaram schrieb:
> Hey Martin,
>
> No I just realized that ESC does not break into the debugger. But I can
> clearly see that the process instead of printing "Hello world" prints "ello
> World" :)
>
> What could the reason be?
>
> Thanks,
> Ramya
> ________________________________________
> From: l4-hackers [l4-hackers-boun...@os.inf.tu-dresden.de] on behalf of
> Martin Schröder [martin.schroe...@openlimit.com]
> Sent: 29 August 2014 17:35
> To: l4-hackers@os.inf.tu-dresden.de
> Subject: Re: Minimal requirements to run L4linux using only a serial console
>
> Hi Ramya,
>
> a: No, its not a must. The UART could also be polled (by a timer) to see if
> something arrived.
> b: At least regarding l4linux there is nothing more to it - afaik.
>
> But let's go back to the hello word example on the SCC. What happens if you
> press the <ESC> key? Does it break into the JDB debugger?
>
> Best regards,
> Martin
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