From: "Cédric Le Goater" <clg@kaod.org>
To: Peter Maydell <peter.maydell@linaro.org>, Thomas Huth <thuth@redhat.com>
Cc: Daniel Henrique Barboza <danielhb413@gmail.com>,
"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
LEROY Christophe <christophe.leroy@csgroup.eu>,
Greg Kurz <groug@kaod.org>,
"qemu-ppc@nongnu.org" <qemu-ppc@nongnu.org>,
David Gibson <david@gibson.dropbear.id.au>
Subject: Re: [PATCH] hw/ppc/ppc405_boards: Change kernel load address
Date: Fri, 3 Dec 2021 13:25:29 +0100 [thread overview]
Message-ID: <f29e3aba-a1d7-484d-2aa2-b676113c4f43@kaod.org> (raw)
In-Reply-To: <CAFEAcA9OQ=nFaMXgFi22BSuchP35OUiTwteG_yxFSnLXFHNTbQ@mail.gmail.com>
On 12/3/21 11:40, Peter Maydell wrote:
> On Fri, 3 Dec 2021 at 10:32, Thomas Huth <thuth@redhat.com> wrote:
>> I guess it's an accidential NULL pointer dereference somewhere in the u-boot
>> code ... which will be quite hard to track down when the first page of
>> memory is marked as writable... :-/
>
> Attach a target-arch gdb to the QEMU gdbstub and put a watchpoint on
> address zero ? (Or if you suspect something inside QEMU is doing it
> then run QEMU under gdb and watchpoint the host memory location
> corresponding to guest address 0, but that's more painful.) Nothing
> in the pre-kernel part of the boot process will have set up paging,
> so the watchpointing should be pretty reliable.
That's the guy:
https://gitlab.com/huth/u-boot/-/blob/taihu/arch/powerpc/cpu/ppc4xx/sdram.c#L199
There must be an error in how get_ram_size() restores the RAM values :
https://gitlab.com/huth/u-boot/-/blob/taihu/common/memsize.c
C.
next prev parent reply other threads:[~2021-12-03 12:28 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-02 19:14 [PATCH] hw/ppc/ppc405_boards: Change kernel load address Cédric Le Goater
2021-12-02 19:17 ` Thomas Huth
2021-12-02 19:19 ` Cédric Le Goater
2021-12-02 19:32 ` LEROY Christophe
2021-12-03 10:27 ` Cédric Le Goater
2021-12-03 10:31 ` Thomas Huth
2021-12-03 10:40 ` Peter Maydell
2021-12-03 12:25 ` Cédric Le Goater [this message]
2021-12-08 13:07 ` Thomas Huth
2021-12-08 13:15 ` Cédric Le Goater
2021-12-08 13:19 ` Thomas Huth
2021-12-08 16:54 ` Cédric Le Goater
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