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From: "dann frazier" <dann.frazier@canonical.com>
To: Leif Lindholm <leif.lindholm@linaro.org>
Cc: Laszlo Ersek <lersek@redhat.com>,
	devel@edk2.groups.io, prabhakar.pkin@gmail.com,
	 Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	naresh.bhat@linaro.org
Subject: Re: [edk2-devel] How /sys/firmware/fdt getting created
Date: Thu, 31 Oct 2019 12:55:10 -0600	[thread overview]
Message-ID: <CALdTtnvwQPoSJCpSZSn=Qs9K0siDsfuLsNSXXBMrhT5_btqTOQ@mail.gmail.com> (raw)
In-Reply-To: <20191031121642.GA16820@bivouac.eciton.net>

On Thu, Oct 31, 2019 at 6:16 AM Leif Lindholm <leif.lindholm@linaro.org> wrote:
>
> On Thu, Oct 31, 2019 at 11:07:52AM +0100, Laszlo Ersek wrote:
> > +Leif, comment at bottom
>
> Thanks Laszlo. +Dann, -kexec.
>
> > On 10/30/19 09:16, Prabhakar Kushwaha wrote:
> > >> So if you want to add these properties, you should add them there.
> > >>
> > >> Can you explain why doing this is necessary?
> > >
> > > I am trying to test kexec -p (kdump feature) on CentOS-release
> > > 7.7.1908 and Ubuntu-18.04 distributions.
> > >
> > >  "kexec -p" command show error on Ubuntu. While no error on CentOS
> > >
> > > CentOS:
> > > $ kexec -p /boot/vmlinuz-`uname -r` --initrd=/boot/initramfs-`uname
> > > -r`.img --reuse-cmdline
> > > $    ==> No error
> > >
> > > Ubuntu
> > > $ kexec -p /boot/vmlinuz-`uname -r` --initrd=/boot/initrd.img-`uname
> > > -r` --reuse-cmdline
> > > $ kexec: elfcorehdr doesn't fit cells-size.
> > > $ kexec: setup_2nd_dtb failed.
> > > $ kexec: load failed.
> > > $ Cannot load /boot/vmlinuz-5.4.0-rc4+
> > >
> > > Note: Both CentOS and Ubuntu has Linux-5.4-rc4 tag.
> > >
> > > When i debugged further reason for Ubuntu error is due to
> > > address-cells and size-cells as "1"
> > > log from kexec tool :-
> > > load_crashdump_segments: elfcorehdr 0x7f7cbfc000-0x7f7cbff7ff
> > > read_1st_dtb: found name =dtb_sys  /sys/firmware/fdt
> > > get_cells_size: #address-cells:1 #size-cells:1
> > >
> > > On CentOS both values are "2".
> > > log from kexec tool :-
> > > load_crashdump_segments: elfcorehdr 0xbf98bf0000-0xbf98bf33ff
> > > read_1st_dtb: found nmae=dtb_sys /sys/firmware/fdt
> > > get_cells_size: #address-cells:2 #size-cells:2
> > >
> > > Note: Kexec tool read values from /sys/firmware/fdt.
> > >
> > > I am trying to figure out why 2 distributions showing different values.
> >
> > http://git.savannah.gnu.org/cgit/grub.git/commit/?id=347210a5d5ce655b95315f320faa515afb723c11
> >
> > Ubuntu probably ships a grub version that lacks this commit.
>
> Yes, it came after the 18.04 release.
> Dann: given that 18.04 is LTS, would it be reasonable to cherry-pick
> this grub patch? I would consider the behaviour without it to be a
> bug.

Leif,

  Likely - I'll run some tests and get back to you...

 -dann

> /
>     Leif
>
> > (The commit was first released as part of upstream grub-2.04. I have no
> > idea what version of grub is shipped in the CentOS distro you mention
> > above -- it could be based upon upstream 2.04, or the upstream patch may
> > have been backported to CentOS.)
> >
> > Thanks
> > Laszlo
> >

  reply	other threads:[~2019-10-31 18:55 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-29 14:32 How /sys/firmware/fdt getting created prabhakar.pkin
2019-10-30  7:12 ` [edk2-devel] " Ard Biesheuvel
2019-10-30  7:36   ` Prabhakar Kushwaha
2019-10-30  7:44     ` Ard Biesheuvel
2019-10-30  8:16       ` Prabhakar Kushwaha
2019-10-31 10:07         ` Laszlo Ersek
2019-10-31 12:16           ` Leif Lindholm
2019-10-31 18:55             ` dann frazier [this message]
     [not found]             ` <15D2D0302F8A1888.21389@groups.io>
2019-10-31 20:34               ` dann frazier
2019-11-01  4:47                 ` Prabhakar Kushwaha
2019-11-01 16:25                   ` dann frazier
2019-11-04  4:11                     ` Prabhakar Kushwaha
2019-10-31 20:29         ` Bhupesh Sharma
2019-11-01  4:51           ` Prabhakar Kushwaha
2019-11-01  5:46             ` Bhupesh Sharma

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