SoCFPGA with CONFIG_THUMB2_KERNEL boot error

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Headers	show Delivered-To: patch@linaro.org Received-SPF: pass (google.com: best guess record for domain of linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org designates 2001:1868:205::9 as permitted sender) client-ip=2001:1868:205::9; MIME-Version: 1.0 In-Reply-To: <20160420095541.GG31470@pengutronix.de> References: <20160419140220.GA9503@pengutronix.de> <20160420092516.GA21732@e103592.cambridge.arm.com> <CAKv+Gu8_hZvY1TK=D3bhwy6F2UW1kSeSGyRciU5wVQPHy0m7LA@mail.gmail.com> <CAKv+Gu9rzxtw2i1QJAU0C-y4Lmh6KDWH0p+TYNHsndr-6c11zw@mail.gmail.com> <20160420095541.GG31470@pengutronix.de> Date: Wed, 20 Apr 2016 12:26:22 +0200 Message-ID: <CAKv+Gu_w-vXnB_56k2sNaTpo1k1DZuvmrS4rwi5kgx=MF4+e+Q@mail.gmail.com> Subject: Re: SoCFPGA with CONFIG_THUMB2_KERNEL boot error From: Ard Biesheuvel <ard.biesheuvel@linaro.org> To: Sascha Hauer <s.hauer@pengutronix.de> summary: Content analysis details: (-2.7 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [2607:f8b0:4001:c05:0:0:0:22d listed in] [list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain Precedence: list Cc: Arnd Bergmann <arnd@arndb.de>, kernel@pengutronix.de, Dinh Nguyen <dinguyen@opensource.altera.com>, Steffen Trumtrar <s.trumtrar@pengutronix.de>, Dave Martin <Dave.Martin@arm.com>, "linux-arm-kernel@lists.infradead.org" <linux-arm-kernel@lists.infradead.org> Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" <linux-arm-kernel-bounces@lists.infradead.org> Errors-To: linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org

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Date: Wed, 20 Apr 2016 12:26:22 +0200
Message-ID: <CAKv+Gu_w-vXnB_56k2sNaTpo1k1DZuvmrS4rwi5kgx=MF4+e+Q@mail.gmail.com>
Subject: Re: SoCFPGA with CONFIG_THUMB2_KERNEL boot error
From: Ard Biesheuvel <ard.biesheuvel@linaro.org>
To: Sascha Hauer <s.hauer@pengutronix.de>
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Cc: Arnd Bergmann <arnd@arndb.de>, kernel@pengutronix.de,
	Dinh Nguyen <dinguyen@opensource.altera.com>,
	Steffen Trumtrar <s.trumtrar@pengutronix.de>,
	Dave Martin <Dave.Martin@arm.com>, "linux-arm-kernel@lists.infradead.org"
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Commit Message

Ard Biesheuvel April 20, 2016, 10:26 a.m. UTC

On 20 April 2016 at 11:55, Sascha Hauer <s.hauer@pengutronix.de> wrote:
> On Wed, Apr 20, 2016 at 11:43:30AM +0200, Ard Biesheuvel wrote:

>> (replying to self)

>>

>> On 20 April 2016 at 11:39, Ard Biesheuvel <ard.biesheuvel@linaro.org> wrote:

>> > (+ Arnd)

>> >

>> > On 20 April 2016 at 11:25, Dave Martin <Dave.Martin@arm.com> wrote:

>> >> On Tue, Apr 19, 2016 at 04:02:20PM +0200, Steffen Trumtrar wrote:

>> >>> Hi!

>> >>>

>> >>> According to kernelci.org (and validating on my own hardware), the current

>> >>> socfpga mainline kernel has an issue with CONFIG_THUMB2_KERNEL enabled.

>> >>>

>> >>> https://storage.kernelci.org/mainline/v4.6-rc4-11-g12566cc35d0e/arm-multi_v7_defconfig/lab-khilman/boot-socfpga_cyclone5_de0_sockit.html

>> >>>

>> >>> vs

>> >>>

>> >>> https://storage.kernelci.org/mainline/v4.6-rc4-11-g12566cc35d0e/arm-multi_v7_defconfig+CONFIG_THUMB2_KERNEL=y/lab-khilman/boot-socfpga_cyclone5_de0_sockit.html

>> >>>

>> >>> Both boot successfully, but notice that the board fails to bring up CPU1 if

>> >>> thumb2 support is enabled.

>> >>>

>> >>> Any ideas why this might be happening?

>> >>

>>

>> Actually, this looks like a problem with the secondary entry point to

>> me. Could you try this?

>

> Been there, done that. Unfortunately this does not solve the problem.

>


How about if you put this on top?


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diff --git a/arch/arm/mach-socfpga/headsmp.S b/arch/arm/mach-socfpga/headsmp.S
index 5d94b7a2fb10..c160fa3007e9 100644
--- a/arch/arm/mach-socfpga/headsmp.S
+++ b/arch/arm/mach-socfpga/headsmp.S
@@ -13,6 +13,7 @@ 
 #include <asm/assembler.h>

        .arch   armv7-a
+       .arm

 ENTRY(secondary_trampoline)
        /* CPU1 will always fetch from 0x0 when it is brought out of reset.

SoCFPGA with CONFIG_THUMB2_KERNEL boot error

Commit Message

Patch