Hi Miquel, On 05/03/25 3:52 pm, Miquel Raynal wrote: > EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe > > On 05/03/2025 at 15:31:33 +0530, Manikandan Muralidharan <manikandan.m@xxxxxxxxxxxxx> wrote: > >> From: Varshini Rajendran <varshini.rajendran@xxxxxxxxxxxxx> >> >> EUI identifier and the MAC Address of the Ethernet Interface is stored >> after the SFDP table of contents starting at address 0x260 in the >> QSPI memory. >> Register the entire SFDP region read by the spi-nor (nor->sfdp) into the >> NVMEM framework and read the MAC Address when requested using the nvmem >> properties in the DT by the net drivers. >> >> In kernel the Ethernet MAC address relied on U-Boot env variables or >> generated a random address, which posed challenges for boards without >> on-board EEPROMs or with multiple Ethernet ports. >> This change ensures consistent and reliable MAC address retrieval from QSPI, >> benefiting boards like the sama5d29 curiosity and sam9x75 curiosity. > > Do you mean spi-nor have a programmable area in their SFDP table? Isn't > this supposed to be a read-only area written once in factory? > The SST26VF064BEUI serial quad flash memory is programmed at the factory with a globally unique address stored in the SFDP vendor parameter table and it is permanently write-protected. https://ww1.microchip.com/downloads/aemDocuments/documents/MPD/ProductDocuments/DataSheets/SST26VF064BEUI-Data-Sheet-DS20006138.pdf > I am not a big fan of exposing the whole SFDP area. I would suggest to > expose just the MAC address. You can make use of nvmem layout drivers if > that is needed. > > Thanks, > Miquèl -- Thanks and Regards, Manikandan M.
