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Re: [PATCH] FreeBSD 64-bit kernel support

From: Joey Korkames
Subject: Re: [PATCH] FreeBSD 64-bit kernel support
Date: Mon, 13 Apr 2009 02:10:47 -0700

Hmm, FreeBSD seems to choke when trying to load the grub-bootstrapped mfsroot.gz (as the root device - haven't tried loading without rooting from it)...

This is a custom mfsroot, booted like so:
menuentry "FreeBSD 7.1-STABLE amd64" {
  freebsd /osstore/STAGE2/FREEBSD/amd64/kernel.gz Dh
  freebsd_loadenv /osstore/STAGE2/FREEBSD/amd64/device.hints
  freebsd_module /osstore/STAGE2/FREEBSD/amd64/mfsroot.gz type=mfs_root
  set FreeBSD.vfs.root.mountfrom=ufs:/dev/md0

perhaps I'll try with the Sysinstall floppy's mfsroot - it might be a little smaller.

PS. A correction for that last patch:
-MOSTLYCLEANFILES += bsd_mod-loader_i386_bsd.d bsd_mod-loader_i386_bsd.d
+MOSTLYCLEANFILES += bsd_mod-loader_i386_bsd.d bsd_mod-loader_i386_bsd_helper.d


Joey Korkames writes:

Figured it out, s/multiboot_mod-loader_i386_multiboot_helper/bsd_mod-loader_i386_bsd_helper/ and bingo!

Worked ion both Xen HVM and on a real amd64 box (over PXE)

Yay GRUB2 and its devs!

Joey Korkames writes:

I can't make grub2 build with phcoder's bsd64.diff. My guess it is beacuse conf/ is missing stuff related to loader/i386/bsd_helper.S $(loader/i386/bsd_helper.S_DEPENDENCIES)?, but I wouldn't how or where to add it in.

phcoder writes:

Bean kindly allowed me to mess with this patch. So here comes an improved version. I moved helpers out of the kernels. Because of how FreeBSD expects the initial virtual memory mapping only first GB of physical memory is accessible so it was required to use of trampoline technique.

Attachment: grub2_bsd_mfsroot_choke.txt
Description: crash.txt

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