Hi Joanna,
The use case right now is to identify and log the firmware version. Eventually, this information will be used to ensure that the platform is using a feature/errata/bug fix.
-Varun
From: Joanna Farley Joanna.Farley@arm.com Sent: Wednesday, 11 January 2023 3:03 PM To: Varun Wadekar vwadekar@nvidia.com; Sandrine Bailleux Sandrine.Bailleux@arm.com Cc: tfa-lts@lists.trustedfirmware.org; tf-a@lists.trustedfirmware.org Subject: Re: [TF-A] Re: Query BL31 version from NWd
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Hi Varun,
Can you allude to the use case here you need this information for? Just so we can flush out any other information needed. With the reference of LTS I was thinking the platform was trying to find out if a security fix is supported or a hardware erratum mitigation was available. Is that the type of use case we are talking about here? Anything else?
Thanks
Joanna
From: Varun Wadekar via TF-A <tf-a@lists.trustedfirmware.orgmailto:tf-a@lists.trustedfirmware.org> Date: Wednesday, 11 January 2023 at 14:33 To: Sandrine Bailleux <Sandrine.Bailleux@arm.commailto:Sandrine.Bailleux@arm.com> Cc: tfa-lts@lists.trustedfirmware.orgmailto:tfa-lts@lists.trustedfirmware.org <tfa-lts@lists.trustedfirmware.orgmailto:tfa-lts@lists.trustedfirmware.org>, tf-a@lists.trustedfirmware.orgmailto:tf-a@lists.trustedfirmware.org <tf-a@lists.trustedfirmware.orgmailto:tf-a@lists.trustedfirmware.org> Subject: [TF-A] Re: Query BL31 version from NWd Hi Sandrine,
This is a good start. Can you help define the SMC FID and the return value for this use case?
Please consider the requirement to return a 3-digit value (x.y.z) to support LTS versions too.
Thanks.
-----Original Message----- From: Sandrine Bailleux <sandrine.bailleux@arm.commailto:sandrine.bailleux@arm.com> Sent: Wednesday, 11 January 2023 8:50 AM To: Varun Wadekar <vwadekar@nvidia.commailto:vwadekar@nvidia.com> Cc: tfa-lts@lists.trustedfirmware.orgmailto:tfa-lts@lists.trustedfirmware.org; tf-a@lists.trustedfirmware.orgmailto:tf-a@lists.trustedfirmware.org Subject: Re: [TF-A] Query BL31 version from NWd
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Hello Varun,
Happy New Year to you too!
This sounds like a reasonable idea to me.
JFYI we introduced an interface to query TF-A semantic version in the following patch:
https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgit.truste...https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgit.trustedfirmware.org%2FTF-A%2Ftrusted-firmware-a.git%2Fcommit%2F%3Fid%3Ddddf4283b043ad0a81d27bd5bb2f0c647c511e11&data=05%7C01%7Cvwadekar%40nvidia.com%7Ce9a3d0e30c954499faeb08daf3e5039b%7C43083d15727340c1b7db39efd9ccc17a%7C0%7C0%7C638090462192025132%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=GN8g%2Bs5gHTuPzo5F7a0v1I6jfs1QbX4l%2FVmF%2Fh%2BB3gA%3D&reserved=0
This is available for any BLx image, not just BL31. At the time, it was just meant to be used internally within TF-A so it's missing the SMC handler to return this information to normal world.
Best regards, Sandrine
On 1/10/23 23:42, Varun Wadekar via TF-A wrote:
Hi,
Happy new year!
For NVIDIA Tegra platforms, we need the capability to query the BL31 version (e.g. 2.7, 2.8, 2.8.x) from the NWd at runtime. I could not find an FID that returns this value.
I propose we introduce a new runtime service in bl31 that returns the version_string to the NWd to support this requirement.
Thoughts?
-Varun
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