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Authored by imp on Fri, Jun 19, 6:40 PM.

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Summary

Support ipxe downloading of a memory disk (either presented to the OS as
a harddisk or a cd). This requires an ipxe server since it uses the ipxe
download protocol to grab the disk. If there is a disk, we add it to the
environment as a disk, and then the rest of the bootloader just sees it
and boots from it.

I've cribbed code from https://github.com/russor/memdisk_uefi and
adapted it to work in the context of the FreeBSD bootloader.

The ixpe_download.h file was created from the documentation of the
interface.

So a .ipxe file with the line
boot loader.elf memdisk=${cwduri}FreeBSD-15.1-RELEASE-amd64-bootonly.iso
would use the FreeBSD boot loader to boot the FreeBSD 15.1 release.

You'll need nvdimm.ko in the kernel, since that's the vector by which we communicate
this ramdisk exists.

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Repository

rG FreeBSD src repository

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Build Status

Buildable 74133
Build 71016: arc lint + arc unit

Event Timeline

imp created this revision.Fri, Jun 19, 6:40 PM

Herald added a reviewer: manu. · View Herald TranscriptFri, Jun 19, 6:40 PM

Herald added subscribers: dab, bcran. · View Herald Transcript

imp requested review of this revision.Fri, Jun 19, 6:40 PM

Harbormaster completed remote builds in B74018: Diff 180086.Fri, Jun 19, 6:40 PM

cracauer added a subscriber: cracauer.Fri, Jun 19, 6:43 PM

imp edited the summary of this revision. (Show Details)Fri, Jun 19, 6:46 PM

Can you put a quick steps to use this in the commit message to support a future rewrite of diskless.7 and the relevant handbook sections? We have big problem of modern netboot is totally undocumented, but I cant fix it because I don't know how to use it.

So I can download the disk, but we hang when the loader tries to find the ramdisk.... But we download the disk, so there's that...

imp retitled this revision from loader.efi: Recongize new memdisk=<url> and memcd=<url> options to loader.efi: Recognize new memdisk=<url> and memcd=<url> options.Mon, Jun 22, 7:16 PM

Update. Also note: I plan on committing the contrib stuff separately

Harbormaster completed remote builds in B74112: Diff 180322.Mon, Jun 22, 7:17 PM

Split out the EDK2 import from this change.

Harbormaster completed remote builds in B74119: Diff 180331.Mon, Jun 22, 10:15 PM

If we're booting this way, assume that we want to boot off of this device. We
can add env vars later if need be.

Harbormaster completed remote builds in B74133: Diff 180348.Tue, Jun 23, 4:51 AM