linux-kernel - Re: ARM Juno r1 + CONFIG_PROVE

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Date:   Fri, 11 Oct 2019 14:43:54 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     Marek Szyprowski <m.szyprowski@...sung.com>
Cc:     James Morse <james.morse@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Liviu Dudau <liviu.dudau@....com>,
        LKML <linux-kernel@...r.kernel.org>,
        Will Deacon <will@...nel.org>,
        Sudeep Holla <sudeep.holla@....com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: ARM Juno r1 + CONFIG_PROVE_LOCKING=y => boot failure

On Fri, Oct 11, 2019 at 03:15:32PM +0200, Marek Szyprowski wrote:
> Hi Sudeep
>
> On 11.10.2019 15:10, Sudeep Holla wrote:
> > On Fri, Oct 11, 2019 at 03:02:42PM +0200, Marek Szyprowski wrote:
> >> Hi James,
> >>
> >> On 11.10.2019 12:38, James Morse wrote:
> >>> Hi guys,
> >>>
> >>> On 11/10/2019 11:05, Sudeep Holla wrote:
> >>>> On Fri, Oct 11, 2019 at 11:26:04AM +0200, Marek Szyprowski wrote:
> >>>>> Recently I've got access to ARM Juno R1 board and did some tests with
> >>>>> current mainline kernel on it. I'm a bit surprised that enabling
> >>>>> CONFIG_PROVE_LOCKING causes a boot failure on this board. After enabling
> >>>>> this Kconfig option, I get no single message from the kernel, although I
> >>>>> have earlycon enabled.
> >>>> I don't have Juno R1 but I tried defconfig + CONFIG_PROVE_LOCKING and
> >>>> it boots fine.
> >>> I just tried this on my r1, v5.4-rc1 with this configuration worked just fine.
> >>>
> >>> My cmdline is:
> >>> | root=/dev/sda6 loglevel=9 earlycon=pl011,0x7ff80000 hugepagesz=2M hugepages=512
> >>> | crashkernel=1G console=ttyAMA0 resume=/dev/sda2 no_console_suspend efi=debug
> >>>
> >> That is a bit strange. Here is a boot log from v5.4-rc1 with pure
> >> defconfig: https://paste.debian.net/1105851/
> >>
> > I see from the boot log that both Image.gz and dtb being loaded at the
> > same address 0x82000000, will u-boot uncompress it elsewhere after loading
> > it ? Just for my understanding.
>
> tftp downloads Image.gz to 0x82000000, then decompress it to
> $kernel_addr to save transfer time
>
> my bootcmd is:
>
> tftp ${fdt_addr} juno/Image.gz; unzip ${fdt_addr} ${kernel_addr}; tftp
> ${fdt_addr} juno/juno-r1.dtb; booti ${kernel_addr} - ${fdt_addr};
>

Thanks for the info. I got hold of R1 board(not the one James has ;))
and it works fine on that too.

Further, with reference to the commit you mentioned make sure defconfig
works with that as it's a commit in the middle of merge window.

I am using gcc7 and I noticed yours is gcc6 not sure if that makes any
difference. Just listing the differences.

I will see if I can grab the exact linaro binaries.

--
Regards,
Sudeep