All of lore.kernel.org
 help / color / mirror / Atom feed
From: ard.biesheuvel@linaro.org (Ard Biesheuvel)
To: linux-arm-kernel@lists.infradead.org
Subject: ARM64 kernel Image size limitations?
Date: Tue, 29 Aug 2017 09:15:30 +0100	[thread overview]
Message-ID: <CAKv+Gu8iBDYpP4Zzq+2Q7cm=kgZpMcGnXNUwyti__TUv+MR=zg@mail.gmail.com> (raw)
In-Reply-To: <de4d0ebc-c522-eb80-0052-3ea13ce4b750@gmail.com>

On 28 August 2017 at 22:24, Florian Fainelli <f.fainelli@gmail.com> wrote:
> (fixed Will's address, apologies)
>
> On 08/28/2017 01:01 PM, Ard Biesheuvel wrote:
>> Hi,
>>
>> On 28 August 2017 at 20:55, Florian Fainelli <f.fainelli@gmail.com> wrote:
>>> Hi,
>>>
>>> I have been fighting with a reasonably large kernel Image: 46MB and
>>> found unable to boot it. This is on v4.13-rc6, but I could go back as
>>> far as v4.9~ish. It is so big, because it's got some debugging enabled,
>>> and the initramfs compression is disabled, but still that ought to be
>>> possible.
>>>
>>> After some experimentation I found that the breaking size is somewhere
>>> around 33MB total for arch/arm64/boot/Image and when that happens, I get
>>> the following backtrace which suggests that there is some memory
>>> corruption of some kind (or so it seems to me), other experiments
>>> indicated that the backtrace may point back to where the bootloader had
>>> set up its exception vector. I am fairly confident that the bootloader
>>> is not responsible for corrupting the Image that is loaded.
>>>
>>> Is there such a size limitation or am I possibly tripping over something
>>> else?
>>>
>>
>> What boot environment are you using? Is it possible the DTB is copied
>> on top of the kernel by the boot loader?
>
> Bootloader is BOLT (Broadcom's own implementation, has PSCI and is
> capable of doing FDT live patching), and yes the DTB is provided by the
> bootloader at an address higher than the kernel.
>
> Physical offset of the RAM on this platform is 0, so the load is going
> to be at PA 0x80000, 0x80000 + size (35MB) = 0x2280000, DTB is placed at
> 0x771f000 and is 0x90ef bytes.
>

Could you try to dump __log_buf from gdb?

  reply	other threads:[~2017-08-29  8:15 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-08-28 19:55 Florian Fainelli
2017-08-28 20:01 ` Ard Biesheuvel
2017-08-28 21:24   ` Florian Fainelli
2017-08-29  8:15     ` Ard Biesheuvel [this message]
2017-08-29 16:51       ` Florian Fainelli
2017-08-29 16:58         ` Florian Fainelli
2017-08-29 10:31 ` Mark Rutland

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to='CAKv+Gu8iBDYpP4Zzq+2Q7cm=kgZpMcGnXNUwyti__TUv+MR=zg@mail.gmail.com' \
    --to=ard.biesheuvel@linaro.org \
    --cc=linux-arm-kernel@lists.infradead.org \
    --subject='Re: ARM64 kernel Image size limitations?' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.