h2horn/espressobin-nix

NixOS on the Marvell ESPRESSObin

NixOS on the Marvell ESPRESSObin

http://espressobin.net/

U-Boot

Build with nix-build -A pkgsCross.aarch64-multiplatform.ubootEspressobinImages.

The bootloader image produced by this repo is currently only for ESPRESSObin V7 1GB!

Extra steps after flashing

1. Load default U-Boot environment with env default -a.
2. Set the correct device tree filename in U-Boot with setenv fdtfile marvell/armada-3720-espressobin.dtb; saveenv.

Boot the generic aarch64 image

1. Add console=ttyMV0,115200n8 to the kernel command line.

TODO

• Fix fdtfile determination in U-Boot (V7 vs not). I think this is broken by the board/board_name variables being wrong.
• Fix MAC addresses not being passed to Linux.

Links

• Issue for mainline U-Boot on the ESPRESSObin: openwrt/openwrt#3360
• Fix for switch initial configuration included in the above: MarvellEmbeddedProcessors/u-boot-marvell#18 (comment)
• How to recover from a bad flash: https://github.com/MarvellEmbeddedProcessors/u-boot-marvell/blob/u-boot-2017.03-armada-17.06/doc/mvebu/uart_boot.txt
• U-Boot documentation for Marvell SoCs: https://gitlab.denx.de/u-boot/u-boot/blob/master/doc/README.marvell
• ARM trusted firmware documentation for Marvell Armada: https://github.com/ARM-software/arm-trusted-firmware/blob/master/docs/plat/marvell/armada/build.rst

Hardware notes

• The V7 schematics (page 9) imply you can boot U-Boot from SD card by setting the three mode jumpers to 1. The wiki page table seems to be wrong, all modes except SPI NOR flash are the same.