Re: Looking for issues/features for my first contribution

[Aleksandar Markovic]

On Thu, Nov 7, 2019 at 11:37 AM Aleksandar Markovic
<address@hidden> wrote:
>
>
>
> On Thursday, November 7, 2019, Rajath Shashidhara <address@hidden> wrote:
>>
>> Hi all,
>>
>> I am a Computer Science graduate student at The University of Texas at 
>> Austin (UT, Austin). I am looking forward to contributing to qemu !
>>
>> This semester, I am taking a class in Virtualization 
>> (https://github.com/vijay03/cs378-f19) and contributing to a virtualization 
>> related open-source project is a significant part of the course.
>> I would be interested in contributing a patchset to qemu - possibly a 
>> self-contained feature or a reasonably complex bug fix that can be completed 
>> in under a month's time. I did look at both the bugtracker and the QEMU 
>> Google Summer of Code 2019 page 
>> [https://wiki.qemu.org/Google_Summer_of_Code_2019] for ideas. However, I 
>> would be interested in hearing from the community and I would be delighted 
>> if somebody can be suggest a suitable project !
>>
>
> Hello, Rajath!
>
> Thank you for expressing interest in QEMU open source project.
>
> There is certainly a place for you and your contributions in QEMU, and you 
> are very welcomed!
>
> It looks to me the following project would fit your description:
>
> 'Implement emulation of DS3231 real time clock in QEMU'
>
> Datasheet:
>
> https://datasheets.maximintegrated.com/en/ds/DS3231.pdf
>
> The steps needed to complete it (in my opinion):
>
> - collect datasheets of as many as possible RTC chips already emulated in 
> QEMU (there are around of dozen of them, see folder hw/rtc)
>

I did a quick Google search on datasheets of existing RTC
implemtations, and the result is:

DS1338: https://datasheets.maximintegrated.com/en/ds/DS1338-DS1338Z.pdf
M41T80: https://www.st.com/resource/en/datasheet/m41t80.pdf
M48T59: http://www.elektronikjk.pl/elementy_czynne/IC/M48T59V.pdf
MC146818: https://www.nxp.com/docs/en/data-sheet/MC146818.pdf
PL031: 
http://infocenter.arm.com/help/topic/com.arm.doc.ddi0224c/real_time_clock_pl031_r1p3_technical_reference_manual_DDI0224C.pdf
TWL92230: 
https://datasheet.octopart.com/TWL92230C-Texas-Instruments-datasheet-150321.pdf
Zynq RTC: 
https://www.xilinx.com/support/documentation/user_guides/ug1085-zynq-ultrascale-trm.pdf
(chapter 7)

Aleksandar

> - do a comparative analysis of selected RTC implementations in QEMU
>
> - get to know general QEMU device model
>
> - design and implement DS3231 emulation
>
> I can give you (unfortunately constrained by tight time limits) some help and 
> guidance. But there are other people in community too (more knowledgable in 
> the area than me).
>
> I salute your initiative!
>
> Yours,
> Aleksandar
>
>
>
>>
>> I am an advanced C programmer with both professional and academic background 
>> in systems design & implementation - especially OS & Networks. Given my 
>> background, I feel fairly confident that I can pickup the QEMU codebase 
>> quickly.
>>
>> Eagerly looking forward to hearing from the community !
>>
>> Thanks,
>> Rajath Shashidhara
>>
>>