kernel: please enable CONFIG_LIBNVDIMM

assigned to @ncopa

how can I test it?

You need a dhcp server configured to hand out boot information for uefi http boot.

Some background information on that:

The essential thing is to have a entry like this (isc dhcpd cfg syntax) ...

   class "httpclients" {
      match if substring (option vendor-class-identifier, 0, 10) = "HTTPClient";
      option vendor-class-identifier "HTTPClient";
      filename "http://server/path/alpine-virt-3.16.0-x86_64.iso";
   }

... then ask the uefi firmware to boot using http.

When "filename" refers to a disk or iso image (instead of some *.efi file) the uefi firmware wil create a ramdisk and boot from that. The firmware will also add a NFIT ACPI table so the linux kernel can find and use the ramdisk too. The later requires CONFIG_LIBNVDIMM being enabled to actually work. I just noticed there also is a CONFIG_ACPI_NFIT option, that is needed too.

Without those config options arch linux complains it can't find the cdrom and drops you to the initrd prompt.

With these config options the kernel should find the ramdisk and alpine linux should boot up all the way to the login pompt.

closed with commit 22b75930

can you please try the linux-lts 5.15.43 kernel from edge repository and confirm that it works?

Then I'll backport it for v3.16.

reopened

Built standard and virt iso images from edge using the instructions from https://wiki.alpinelinux.org/wiki/How_to_make_a_custom_ISO_image_with_mkimage

Not working, most likely due to CONFIG_ACPI_NFIT being built modular and the module (kernel/drivers/acpi/nfit/nfit.ko) not being included when building the initramfs

Doesn't this also mean that the drivers for the network interface needs to be in the initramfs?

Nope, the firmware loads the complete iso image into ram, so the firmware's nic driver is enough.

mentioned in commit 03d13111

mentioned in commit mkinitfs@bdf957c4

I got it working for -virt kernel. will try get it working for -lts as well.

changed milestone to %3.18.0

mentioned in commit 7a17a2b7

closed with commit c992a86c

kernel: please enable CONFIG_LIBNVDIMM

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