Comment 0 for bug 1995848

[ Impact ]

The PolarFire Icicle Kit development board provides good upstream support. Microchip plans to ship this boards for a long time. We should enable the hardware in the Jammy LTS release. This requires providing U-Boot.

The rebuild will be based on OpenSBI 1.1 which will we copied to Jammy with #1995261.

We will enable reset via SBI for all RISC-V platforms with patch d/p/riscv64/sysreset-sbi.patch.

For Jammy the package u-boot-microchip is new. Booting in Jammy will depend on a 5.19 kernel.

[ Test Plan ]

Due to the updated OpenSBI we will have to retest all Ubuntu Jammy supported RISC-V platforms (Nezha, VisionFive, Unmatched, QEMU) plus the PolarFire Icicle kit:

* Boot preinstalled images.
* Update U-Boot.
* Install clang and run 'clang -v' (This failed on the Nezha platform with an older OpenSBI).
* Test reset form Linux.
* Test poweroff from Linux (SiFive HiFive Unmatched and QEMU).

[ Where problems could occur ]

Booting, resetting, and poweroff of all RISC-V platforms might fail due to the updated OpenSBI.

The updated OpenSBI might lead to failures due to incorrect emulation of unimplemented RISC-V instructions or incorrect interrupt handling.

[ Other Info ]