u-boot 2022.01+dfsg-2ubuntu1 breaks nvme on RISC-V unmatched board

[Alexandre Ghiti]

When booting a jammy image on the SiFive Unmatched board, the nvme disk do not appear whereas by simply replacing u-boot with the previous version 2021.07+dfsg-0ubuntu8 works fine.

Could be related to upstream commit a398a51ccc68c0a7aee14f8328dc86a1a4cfba85 ("pci: Work around PCIe link training failures"), I have to try.

This does not look related to opensbi as both versions were built against the same opensbi version.

[Alexandre Ghiti (alexghiti)]

Actually the last assertion is wrong:

ubuntu@ubuntu:~$ sudo apt info u-boot-sifive=2021.07+dfsg-0ubuntu8
Package: u-boot-sifive
Version: 2021.07+dfsg-0ubuntu8
Built-Using: opensbi (= 0.9-2ubuntu2)

ubuntu@ubuntu:~$ sudo apt info u-boot-sifive=2022.01+dfsg-2ubuntu1
Package: u-boot-sifive
Version: 2022.01+dfsg-2ubuntu1
Built-Using: opensbi (= 1.0-3ubuntu1)

One more thing to check on my side.

[Alexandre Ghiti (alexghiti)]

And:

ubuntu@ubuntu:~$ sudo apt info u-boot-sifive=2021.07+dfsg-0ubuntu10
Package: u-boot-sifive
Version: 2021.07+dfsg-0ubuntu10
Built-Using: opensbi (= 0.9+187.52af6e4b52-0ubuntu1)

[Heinrich Schuchardt (xypron)]

My Unmatched board has /boot on NVMe and distroboot via extlinux.conf works fine.

Please, describe your set-up. Where is your /boot directory? On MMC or on NVMe? Maybe we have to add 'pci enum' to preboot if this is needed to preconfigure PCI.

[Alexandre Ghiti (alexghiti)]

This issue seems to have a fix in Linux, which is nice since it does not depend on u-boot at all:

https://patchwork.kernel<email address hidden>/

I'll give it a try.

[Alexandre Ghiti (alexghiti)]

As reported here, there is an issue with the PCI controller on the unmatched board that must be fixed in Linux (cf [1]) and u-boot: for u-boot, the upstream commit a398a51ccc68c0a7aee14f8328dc86a1a4cfba85 ("pci: Work around PCIe link training failures") should be cherry-picked for 22.04.

Thanks

[1] https://bugs.launchpad.net/ubuntu/+source/linux-riscv/+bug/1964796

[Launchpad Janitor (janitor)]

This bug was fixed in the package u-boot - 2022.01+dfsg-2ubuntu2

---------------
u-boot (2022.01+dfsg-2ubuntu2) jammy; urgency=medium

  * d/patches: Add SiFive Unmatched PCIe fix (LP: #1965321)

 -- Alexandre Ghiti <email address hidden> Fri, 25 Mar 2022 11:15:18 +0100