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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. However,
I've decided to not include the ACPI table updates since we can use
FreeBSD's md more directly.

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.

gzip, bzip2 and zstd compressed files are automatically decompressed on the fly.

Diff Detail

Repository

rG FreeBSD src repository

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Unit

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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

Implement decompression

Harbormaster completed remote builds in B74270: Diff 180655.Thu, Jun 25, 10:30 PM

imp edited the summary of this revision. (Show Details)Thu, Jun 25, 10:32 PM

tweak a little

Harbormaster completed remote builds in B74272: Diff 180660.Thu, Jun 25, 11:21 PM