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Re: [Qemu-devel] [PATCH] upgrading emulated UART to 16550A
From: |
Stefano Stabellini |
Subject: |
Re: [Qemu-devel] [PATCH] upgrading emulated UART to 16550A |
Date: |
Tue, 05 Aug 2008 16:15:47 +0100 |
User-agent: |
Thunderbird 2.0.0.14 (X11/20080505) |
Jason Wessel wrote:
> I didn't spend the time to figure out what was wrong, but I thought I'd
> try your new port emulation against KGDB which is known to work with
> real hardware, as well as the existing 16450 qemu uart support.
>
> For some reason, the initial interrupt if a character comes into the
> uart does not seem to get raised, so the kernel routine which handles
> the traffic never gets invoked. It is possible that the that the kgdb
> kernel driver has a defect, but this does seem to work on real hardware,
> so perhaps it is a timing problem or the qemu emulation is not quite
> accurate with respect to the real hardware.
>
> If you like, I can provide you a bzImage and the qemu invocation, such
> that you could see the problem first hand.
>
yeah, that could help.
[Qemu-devel] [PATCH] upgrading emulated UART to 16550A, Stefano Stabellini, 2008/08/08