On Tue, Oct 12, 2021 at 1:34 AM Jean-Philippe Brucker <jean-phili...@linaro.org> wrote: > > Hi Haiwei, > > On Mon, Oct 11, 2021 at 06:10:07PM +0800, Haiwei Li wrote: > [...] > > Gave up waiting for root file system device. Common problems: > > - Boot args (cat /proc/cmdline) > > - Check rootdelay= (did the system wait long enough?) > > - Missing modules (cat /proc/modules; ls /dev) > > ALERT! UUID=3caf26b5-4d08-43e0-8634-7573269c4f70 does not exist. > > Dropping to a shell! > > > > Any suggestions? Thanks. > > It's possible that the rootfs is on a disk behind the IOMMU, and the IOMMU > driver doesn't get loaded. That could happen, for example, if the > virtio-iommu module is not present in the initramfs. Since IOMMU drivers > are typically built into the kernel rather than modules, distro tools that > build the initramfs might not pick up IOMMU modules. I'm guessing this > could be the issue here because of the hints and "Dropping to a shell" > line. > > The clean solution will be to patch the initramfs tools to learn about > IOMMU drivers (I'm somewhat working on that). In the meantime, if this is > indeed the problem, you could try explicitly adding the virtio-iommu > module to the initramfs, or building the kernel with CONFIG_VIRTIO_IOMMU=y > rather than =m, though that requires VIRTIO and VIRTIO_PCI to be built-in > as well.
Thanks, Jean. It works. -- Haiwei
