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I checked the ACPI spec and it says the UEFI RuntimeCode/RuntimeData is tre= ated as AddressRangeReserved type by OS (see ACPI spec 15.3 UEFI GetMemoryMap() Boot Services Function)

I think the AddressRangeReserved type is NOT restored by OS when resuming f= rom S4.
Can you double check?



Thanks,
Ray

From: devel@edk2.groups.io = <devel@edk2.groups.io> on behalf of =D5=C5=B3=BD <zhangchen@loongs= on.cn>
Sent: Friday, January 17, 2025 16:42
To: devel@edk2.groups.io <devel@edk2.groups.io>
Cc: gaoliming <gaoliming@byosoft.com.cn>; lichao <lichao@lo= ongson.cn>; =C7=AE=B6=AB=D1=E5 <qiandongyan@loongson.cn>; Kinney, = Michael D <michael.d.kinney@intel.com>
Subject: [edk2-devel] Problems with modifying variables after S4 rec= overy
 
Hello=A3=AC

An issue regarding the variable has been encountered on the LoongArch platfor= m. Modifying the variable using efivar after S4 resume will cause data corr= uption in the flash.
It was found that when starting from S4, the BIOS might write to the variable= . After the system resumes, the data in the runtime memory will also be res= tored, resulting in inconsistent data between that in the VARIABLE_MODULE_G= LOBAL structure and the actual data. There is already data in the flash area corresponding to NonVolatileLastVa= riableOffset.
It's suspected that there will also be problems on other platforms. I'd like to= know whether other platforms have encountered similar problems and if ther= e are any solutions?

Thanks
zhangchen@l= oongson.cn


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