Hi Javier Since you asked about PDR, here is a some basic information about that. Platform Data Region (PDR) can be enabled for storing any customer specific data. PDR needs to enabled during IFWI stitch and a PDR input file can be specified to create the PDR region. Apollolake SpiFlashLib in SBL already supports access to PDR - The FlashRegionType needs to be specified as "FlashRegionPlatformData". Thanks Ravi From: Sbl-devel [mailto:sbl-devel-bounces@lists.01.org] On Behalf Of Dong, Guo Sent: Wednesday, May 8, 2019 10:59 AM To: Javier Santos Romo <jsantos(a)gmv.com&gt;; sbl-devel(a)lists.01.org Subject: Re: [Sbl-devel] Non Volatile Storage in SPI BIOS Hi Javier, There is a SetVariable() in litevariablelib to provide a method to save NV variable data to SPI flash. The purpose of the API is to save some small variable data that doesn't frequently change from boot to boot since variable reclaim will take times. Current usage is to save eMMC tuning data. NOTE: Currently SPI flash would be locked after PostPciEnumeration on APL. It means variable writing after this point might fail. If you want to save NV data in OsLoader, one solution is that you could set FspsConfig->SpiEiss = 0x0; not to lock SPI flash in PostPciEnumeration time, later you need lock SPI flash in OS loader. Thanks, Guo From: Sbl-devel [mailto:sbl-devel-bounces@lists.01.org] On Behalf Of Javier Santos Romo Sent: Wednesday, May 8, 2019 10:05 AM To: sbl-devel@lists.01.org<mailto:sbl-devel@lists.01.org> Subject: [Sbl-devel] Non Volatile Storage in SPI BIOS Hi all, I was wonder if there is an easy way to storage nonvolatile variables inside SPI BIOS. I would like to storage some variables in this way to be able to detect its value every time Board boots up. I have read about a region called PDR (Platform Data Region) that I suppose is best place we could use to storage these variables. However, I haven´t seen any clear example around SBL code where this objective is achieved. Could you provide us any example or snippet code where this functionality is implemented or if there is a library we can use? Regards, Javier P Please consider the environment before printing this e-mail.