When length is larger than block size and block size aligned, if the address is not block size aligned, that means the range will mix with other range, but erase operation will be done per block, that will be risky and may break the fault tolerant mechanism.

I could not remember all the details. Personally, I do not think it is right way to remove the check.

Thanks,

Star

From: Lean Sheng Tan <sheng.tan@9elements.com>
Sent: Tuesday, May 17, 2022 7:58 PM
To: devel@edk2.groups.io; Wu, Hao A <hao.a.wu@intel.com>
Cc: Zeng, Star <star.zeng@intel.com>; Gao, Liming <gaoliming@byosoft.com.cn>; Rhodes, Sean <sean@starlabs.systems>
Subject: Re: [edk2-devel] [PATCH] MdeModulePkg/FaultTolerantWriteDxe: Don't check for address alignment

Hi Star & Liming,

Any update on this?

Much appreciated.

Best Regards,

Lean Sheng Tan

9elements GmbH, Kortumstraße 19-21, 44787 Bochum, Germany

Email: sheng.tan@9elements.com

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On Mon, 16 May 2022 at 11:03, Wu, Hao A <hao.a.wu@intel.com> wrote:

Sorry Star and Liming,

For the below patch (removing the alignment check for WorkSpace & SpareArea):

https://edk2.groups.io/g/devel/message/89742

Do you think it will impact the FTW service on flash device? Thanks in advance.

Best Regards,

Hao Wu

From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Sean Rhodes
Sent: Monday, May 16, 2022 3:54 PM
To: Wu, Hao A <hao.a.wu@intel.com>
Cc: devel@edk2.groups.io
Subject: Re: [edk2-devel] [PATCH] MdeModulePkg/FaultTolerantWriteDxe: Don't check for address alignment

The bug discovered was with coreboot, and the PCD values are derived from the block size of its SMMStore (NvStorage) region. The discussion on the patch can be found here: https://review.coreboot.org/c/coreboot/+/62990

Hacking the PCDs could work,, but why would we want to keep an incorrect check?

Thanks!

On Mon, 16 May 2022 at 08:36, Wu, Hao A <hao.a.wu@intel.com> wrote:

Sorry for not being clear on what I mean.

Is it possible to change the platform PCD values and keep these block size alignment requirements.

Best Regards,

Hao Wu

From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Sean Rhodes
Sent: Monday, May 16, 2022 3:00 PM
To: Wu; Wu, Hao A <hao.a.wu@intel.com>; devel@edk2.groups.io
Subject: Re: [edk2-devel] [PATCH] MdeModulePkg/FaultTolerantWriteDxe: Don't check for address alignment

Hi Hao

Yes, it does conflict - I will update the patch to fix these comments :)

Thank you