RE: AST2600 support in QEMU

[Shivi Fotedar]

Cedric, Joel

Thanks so much for the pointers. This definitely helps. We will get back to you 
with any further questions once we have looked them over. 

-----Original Message-----
From: Cédric Le Goater <clg@kaod.org> 
Sent: Tuesday, August 9, 2022 10:50 PM
To: Joel Stanley <joel@jms.id.au>; Shivi Fotedar <sfotedar@nvidia.com>; Peter 
Delevoryas <peter@pjd.dev>; Jeremy Kerr <jk@ozlabs.org>; Klaus Jensen 
<its@irrelevant.dk>; Jonathan Cameron <jonathan.cameron@huawei.com>
Cc: qemu-devel@nongnu.org; Andrew Jeffery <andrew@aj.id.au>; Amit Kumar 
(Engrg-SW) <asinghal@nvidia.com>; Prasanna Karmalkar <pkarmalkar@nvidia.com>; 
Tim Chen (SW-GPU) <timch@nvidia.com>; Newton Liu <newtonl@nvidia.com>; Deepak 
Kodihalli <dkodihalli@nvidia.com>; qemu-arm <qemu-arm@nongnu.org>
Subject: Re: AST2600 support in QEMU

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Hello,

On 8/10/22 04:37, Joel Stanley wrote:
> Hello Shivi,
>
> I've added others to cc who may have some input.
>
> On Tue, 9 Aug 2022 at 21:38, Shivi Fotedar <sfotedar@nvidia.com> wrote:
>>
>> Hello, we are looking for support for few features for AST2600 in 
>> QEMU, specifically
>>
>> PCIe RC support so BMC can talk to downstream devices for management 
>> functions.
>
> I haven't seen any PCIe work done yet.

I haven't either. There is clearly a need now that we are moving away from LPC.

>> MCTP controller to run MCTP protocol on top of PCIe or I2C.
>
> What work would be required to do this on top of i2c?

I think Jonathan and Klaus worked on this. See :

   
https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flore.kernel.org%2Fqemu-devel%2F20220525121422.00003a84%40Huawei.com%2F&amp;data=05%7C01%7Csfotedar%40nvidia.com%7C09cd2aefa2a24815b86e08da7a94370d%7C43083d15727340c1b7db39efd9ccc17a%7C0%7C0%7C637957074871711009%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=Z0jZN8QEjZIk1zxgfr37NOt%2BNp4q6bDRkxO8KI4Clrw%3D&amp;reserved=0

>> I2C slave so BMC can talk to host CPU QEMU for IPMI
>
> Some support for slave mode was merged in v7.1.

yes.

Peter D. experimented with IPMI. See :

   
https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flore.kernel.org%2Fqemu-devel%2F20220630045133.32251-14-me%40pjd.dev%2F&amp;data=05%7C01%7Csfotedar%40nvidia.com%7C09cd2aefa2a24815b86e08da7a94370d%7C43083d15727340c1b7db39efd9ccc17a%7C0%7C0%7C637957074871711009%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=a4bP1xJGC25Dp9UkYKU5i%2BODLQrpfgLN%2BaQPkK9LRZc%3D&amp;reserved=0

We also merged a new machine including a BMC ast2600 running OpenBMC and an 
ast1030 SoC running OpenBIC. Work to interconnect them on the same I2C bus is 
in progress.

Thanks,

C.