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Re: [Qemu-devel] [RFC v4 4/5] hw/arm/digic: add UART support
From: |
Antony Pavlov |
Subject: |
Re: [Qemu-devel] [RFC v4 4/5] hw/arm/digic: add UART support |
Date: |
Fri, 6 Sep 2013 17:00:15 +0400 |
On Fri, 6 Sep 2013 08:25:20 +0100
Peter Maydell <address@hidden> wrote:
> On 6 September 2013 07:54, Antony Pavlov <address@hidden> wrote:
> > On Thu, 5 Sep 2013 19:17:50 +0100
> > Peter Maydell <address@hidden> wrote:
> >> Does this UART really not have a FIFO?
> >
> > There is no public documentation on Digic chips.
> > Only Canon's engineers know something about Digic's FIFO (if it exists :).
>
> You can deduce its existence though -- does the
> UART let you feed two or three characters to it
> at faster than whatever the serial line speed is
> before it sets the "stop sending me bits" status
> bit, or does it stop after the first?
No, I can't :)
How can I check this mysterious "stop sending me bits" status bit?
Do you mean the UART hardware flow control pin?
I can't use hardware flow control as I have only 3-wire UART on the camera.
Moreover I have to enable hardware flow control in software, but I have
no information how to do it.
> If the real firmware uses this for anything remotely
> serious (ie for more than trivial and default-disabled
> debug info) it probably does have a FIFO. However,
> let's assume it doesn't for now.
>
> -- PMM
--
--
Best regards,
Antony Pavlov
- [Qemu-devel] [RFC v4 1/5] hw/arm: add very initial support for Canon DIGIC SoC, (continued)
[Qemu-devel] [RFC v4 3/5] hw/arm/digic: add timer support, Antony Pavlov, 2013/09/05
[Qemu-devel] [RFC v4 4/5] hw/arm/digic: add UART support, Antony Pavlov, 2013/09/05
- Re: [Qemu-devel] [RFC v4 4/5] hw/arm/digic: add UART support, Peter Maydell, 2013/09/05
- Re: [Qemu-devel] [RFC v4 4/5] hw/arm/digic: add UART support, Antony Pavlov, 2013/09/06
- Re: [Qemu-devel] [RFC v4 4/5] hw/arm/digic: add UART support, Peter Maydell, 2013/09/06
- Re: [Qemu-devel] [RFC v4 4/5] hw/arm/digic: add UART support,
Antony Pavlov <=
- Re: [Qemu-devel] [RFC v4 4/5] hw/arm/digic: add UART support, Peter Maydell, 2013/09/06
- Re: [Qemu-devel] [RFC v4 4/5] hw/arm/digic: add UART support, Antony Pavlov, 2013/09/07
- Re: [Qemu-devel] [RFC v4 4/5] hw/arm/digic: add UART support, Peter Maydell, 2013/09/07
[Qemu-devel] [RFC v4 2/5] hw/arm/digic: prepare DIGIC-based boards support, Antony Pavlov, 2013/09/05
[Qemu-devel] [RFC v4 5/5] hw/arm/digic: add NOR ROM support, Antony Pavlov, 2013/09/05