OpenSBI: system reset support missing for HiFive Unmatched

[Heinrich Schuchardt]

With our current images the Linux poweroff and reboot commands fail. Same for U-Boot.

https://github.com/sifive/meta-sifive/tree/2021.06/recipes-bsp/opensbi/files/unmatched contains a series of patches to provide the system reset extension in OpenSBI.

http://lists.infradead.org/pipermail/opensbi/2021-July/001243.html is starts a series of patches to upstream a system reset extension implementation.

Suggested actions:

Build OpenSBI with one of the two series and check what additional changes in Linux and U-Boot might be needed to get working poweroff and reboot.

Best regards

Heinrich

[Heinrich Schuchardt (xypron)]

The patches from SiFive (http://lists.infradead.org/pipermail/opensbi/2021-July/001243.html) for a GPIO reset driver have been added to upstream OpenSBI in July.

A patch has been sent upstream to make that driver usable if a boards supports both gpio-reset and gpio-powerdown:

[PATCH 1/1] lib: utils: support multiple reset drivers of same type
http://lists.infradead.org/pipermail/opensbi/2021-July/001534.html

A device-tree node is missing for gpio-reset in U-Boot's device-tree.

[Heinrich Schuchardt (xypron)]

There is no GPIO for system reset on the HiFive unmatched.

Patches for an SBI based sysreset driver have been sent to upstream U-Boot.
https://lists.denx.de/pipermail/u-boot/2021-September/460291.html

The is an ongoing discussion about how UEFI runtime system reset drivers should be implemented. Some maintainers wish a driver model based solution and don't wont to follow the style of previous reset drivers like for PSCI.

[Heinrich Schuchardt (xypron)]

opensbi - 0.9+187.52af6e4b52-0ubuntu1 has been packaged in ppa:xypron/opensbi to resolve LP: 1937055

[Launchpad Janitor (janitor)]

This bug was fixed in the package opensbi - 0.9+187.52af6e4b52-0ubuntu1

---------------
opensbi (0.9+187.52af6e4b52-0ubuntu1) jammy; urgency=medium

  * New upstream release snapshot which supports system reset on the
    SiFive Unmatched board (LP: #1937055)

 -- Heinrich Schuchardt <email address hidden> Mon, 22 Nov 2021 12:56:27 +0100