Re: [Qemu-devel] [PATCH] watchdog: add support to emulate winbond w83627thf

[Daniel Fahlgren]

Hi Paolo,

On Wed, 2015-10-07 at 11:09 +0200, Paolo Bonzini wrote:
> 
> On 07/10/2015 10:49, Daniel Fahlgren wrote:
> > Hi,
> > 
> > On Mon, 2015-09-14 at 22:07 +0200, Daniel Fahlgren wrote:
> >> This patch adds support to emulate the watchdog functionality on the
> >> Winbond w83627thf chip. The other features of the chip are not emulated.
> >> It has been tested with Ubuntu 6.06, 14.04 and 15.04 as guests using the
> >> w83627hf_wdt module.
> > 
> > Ping, who should I poke about this? The maintainers file does not
> > mention the watchdog system.
> 
> Hi,
> 
> sorry for missing this patch.
> 
> I have a couple of questions.  First, where can I find a spec for this
> chip in order to review the code, and what are the other features?
> Second, what are the advantages over the existing watchdog devices?

The spec can be found at
http://www.alldatasheet.com/datasheet-pdf/pdf/206865/WINBOND/W83627THF.html

To quote the datasheet about the other features:

"83627THF is a Winbond LPC I/O product. It integrates the following
major peripheral functions in a chip: the disk driver adapter (FDC),
Serial port (UART), Parallel port (SPP/EPP/ECP), Keyboard controller
(KBC), SIR, Game port, MIDI port, Hardware Monitor, ACPI, On Now Wake-Up
features."

My reason for implementing this watchdog is that I have a Linux system
image that depends on /dev/watchdog being present. That image only has a
single kernel module for watchdogs enabled which happened to be this
one. So no advantages except diversity and giving the users the option
to choose from different devices.

Best regards,
Daniel Fahlgren