sysutils/u-boot-starfive-visionfive2: new port

[mhorne]

Summary

Create a u-boot port for the VisionFive 2 RISC-V SBC.

A small tweak to the default configuration is required to work with the
OpenSBI binary provided by sysutils/opensbi.

Sponsored by: The FreeBSD Foundation

Test Plan

Tested on real hardware using the exact commands described in the description.

[jrtc27]

Hm, OpenSBI is supposed to be built as a PIE by default if the toolchain supports it, which LLVM should, and thus it shouldn't matter where the SPL loads OpenSBI. Debian doesn't override this as far as I can tell, yet also uses its generic OpenSBI binary package.

[manu]

You need to add the port to sysutils/Makefile
Otherwise lgtm

[mhorne]

In D43517#992173, @jrtc27 wrote:

Hm, OpenSBI is supposed to be built as a PIE by default if the toolchain supports it, which LLVM should, and thus it shouldn't matter where the SPL loads OpenSBI. Debian doesn't override this as far as I can tell, yet also uses its generic OpenSBI binary package.

If I had simply tried this I would have saved myself a few hours... I think I was thrown by the emphasis of setting FW_TEXT_START when building opensbi in the u-boot documentation. The PIE binary does work; update incoming.

u-boot seems to always demand a sacrifice from me, in one way or another.

[mhorne]

Remove the config fragment. Add the port to SUBDIR list.