Hi,
As the design proposal submitted before， https://review.trustedfirmware.org/c/TF-M/trusted-firmware-m/+/8033,we are planning to add a new ETSS partition(External Trusted Secure Storage partition) which supplies
external secure storage services based on secure Flash.
To avoid circular dependency,this new partition needs to access data in external secure Flash on its own rather than relies on tfm ITS service.
Currently,the ETSS reuses tfm ITS filesystem as a temporary solution, it needs to share this filesystem between ITS and ETSS partition to reduce code size.
Should the code sharing between different SP be the same as the code sharing between mcuboot and tf-m runtime firmware implemented as this proposal, https://review.trustedfirmware.org/c/TF-M/trusted-firmware-m/+/4587
or other implementations?
Best Regards, Poppy Wu
Macronix Microelectronics (Suzhou) Co.,Ltd http://www.mxic.com.cn
David Hu David.Hu@arm.com 2021/05/24 13:48
To Edward Yang EdwardYang@mxic.com.cn, "tf-m@lists.trustedfirmware.org" tf-m@lists.trustedfirmware.org cc nd nd@arm.com Subject RE: [TF-M] A question on tfm its filesystem
Hi Poppy,
SPRT requires the shared library shall not own static R/W data. ITS filesystem may not satisfy this requirement. Usually, a SP, for example Protected Storage, can rely on ITS service to access data in non-volatile memory.
Best regards, Hu Ziji
From: TF-M tf-m-bounces@lists.trustedfirmware.org On Behalf Of Edward Yang via TF-M Sent: Monday, May 24, 2021 12:54 PM To: tf-m@lists.trustedfirmware.org Subject: [TF-M] A question on tfm its filesystem
Hi,
I'd like to ask a question to see if the filesystem part of tf-m its partition can be moved to lib/sprt folder,to make this filesystem a shared library for PRoT part of tfm.
Therefore,besides its partition, other extra secure partitions can also make use of this filesystem.
Best Regards, Poppy Wu
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