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From: Rajath Shashidhara <rajaths@cs.utexas.edu>
To: Aleksandar Markovic <aleksandar.m.mail@gmail.com>
Cc: "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>
Subject: Re: Looking for issues/features for my first contribution
Date: Sat, 9 Nov 2019 15:33:14 -0600
Message-ID: <1ec3ea6a-6a75-15eb-086c-d8f5e33bc0dc@cs.utexas.edu> (raw)
In-Reply-To: <CAL1e-=hNH6HaKsczgkUdgbt18E2V2Cm6oPhSQewvMKvVTnarbA@mail.gmail.com>



On 11/9/19 1:46 PM, Aleksandar Markovic wrote:

> 
> 
> Hi, Rajath.
> 
> No, it doesn't. Linux kernel has a driver for DS3231. Take a closer look.

Kernel driver found here:
https://elixir.bootlin.com/linux/v5.4-rc6/source/drivers/rtc/rtc-ds3232.c
did register NVMEM of 236 bytes with the kernel. As long as this NVMEM
is never accessed, the same driver should work for both DS3231 and DS3232.

Is there any other driver you are referring to ? Please let me know if I
missed something here.

> 
> But, in any case, you base your QEMU emulation on the *datasheet*.
> 
> The OS drivers may be helpful, but they are not a reference you base
> your solution on. The drivers may be obsolete, incorrect, incomplete, or
> just plain wrong. Additionally, as QEMU, of course, supports emulation
> of systems running variety of OSs, the existence of the Linux kernel
> driver is not a necessary condition for QEMU implementation. QEMU
> emulates many systems that Linux never ran on, and could not be run at all.
> 

I was only looking at the Kernel drivers to setup a test framework. I
plan to test my implementation using a Raspi emulation with qemu,
configure it with a DS3231 device. After this, I should be able to use
ioctl() on /dev/rtc to test the functionality:
https://linux.die.net/man/4/rtc

If you have a better approach to testing, do let me know.

Thanks,
Rajath Shashidhara


  reply index

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-06 23:50 Rajath Shashidhara
2019-11-07 10:37 ` Aleksandar Markovic
2019-11-07 13:33   ` Aleksandar Markovic
2019-11-07 18:49     ` Rajath Shashidhara
2019-11-08  2:39     ` Rajath Shashidhara
2019-11-08  9:08       ` Alex Bennée
2019-11-08 13:05         ` Richard Henderson
2019-11-08 19:31       ` Aleksandar Markovic
2019-11-09 16:01         ` Peter Maydell
2019-11-09 21:08           ` Aleksandar Markovic
2019-11-10 14:33             ` Peter Maydell
2019-11-08 19:36       ` Aleksandar Markovic
2019-11-08 21:54         ` BALATON Zoltan
2019-11-09 19:46       ` Aleksandar Markovic
2019-11-09 21:33         ` Rajath Shashidhara [this message]
2019-11-09 23:55           ` Aleksandar Markovic
2019-11-07 11:18 ` Alex Bennée
2019-11-07 13:54 ` Stefan Hajnoczi
2019-11-07 18:51   ` Rajath Shashidhara

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