Marty Ryba

OK, so there's new security settings for u-boot. To get this to work, you have to run petalinux-config -c u-boot, then go to: Environment->Enable overwriting environment hit the space bar to enable environment overwrite by uEnv.txt

I found the answer in the README.md for the PetaLinux build blob https://github.com/Digilent/Petalinux-Cora-Z7-07S, which I initially had ignored since I'm using 2022.1 BUT, I get this error: U-Boot 2022.01 (Apr 04 2022 - 07:53:54 +0000) CPU: Zynq 7z007s Silicon: v3.1 DRAM: ECC disabled 512 MiB Flash: 0 Bytes NAND: 0 MiB MMC: mmc@e0100000: 0 Loading Environment from FAT... *** Error - No Valid Environment Area found *** Warning - bad env area, using default environment In: serial@e0000000 Out: serial@e0000000 Err: serial@e0000000 Net: ZYNQ GEM: e000b000, mdio bus e000b000, phyaddr -1, interface rgmii-id eth0: ethernet@e000b000 Hit any key to stop autoboot: 0 switch to partitions #0, OK mmc0 is current device Scanning mmc 0:1... Found U-Boot script /boot.scr 2776 bytes read in 13 ms (208 KiB/s) ## Executing script at 03000000 Trying to load boot images from mmc0 26 bytes read in 10 ms (2 KiB/s) Importing environment(uEnv.txt) from mmc0... ## Error: Can't overwrite "ethaddr" himport_r: can't insert "ethaddr=00:18:3E:04:2B:1C" into hash table

Hi have a couple Cora boards I plan to have in a system together. I notice when they boot (same kernel image) they come up with the same Ethernet MAC address. Once the system is up I can temporarily change one using ifconfig, but that's not ideal. The Xilinx forum mentions that uboot gets the device part of the address from something in an I2C EEPROM, at least on some of their dev boards. Is there a process for doing similar to a Cora? The reference manual says something about a sticker, what am I supposed to do with that information? Do I have to create a different Petalinux build for each board (ugh!)?

He got a better answer in the Xilinx forum, since those files are auto-generated your edits will tend to disappear. Instead, you put this in your system-user.dtsi: system-user.dtsi

Hi, we are developing a project, and I thought the Cora-Z7-07S was the right solution, so we got 3. Now, as I'm building up the project, I hit a wall. Some of the GPIOs I need to control are 1.8V logic, not 3.3V. I thought I could just tweak the constraints and be done, but no, you can't mix the voltages on the same IO bank, and it appears all the interfaces (included the unloaded ones) are on 3.3V banks! Is there a similar small board that I should get instead, or do I need to start hacking in level shifting?