Hi, > >> 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. Why didn't you mention that this is a vendor table in the commit message? Anyway, please write proper support in the core for parsing vendor tables and exposing them as a nvmem device if needed (and asked to do so by the driver of course). -michael
