From: Lewis Zhou <lewisou@gmail.com>
To: crossgcc@sourceware.org
Subject: Fwd: selected processor does not support `rev r7,r7'
Date: Thu, 21 Mar 2019 08:24:00 -0000 [thread overview]
Message-ID: <CAD_PvuY8oVy3Ny65bcF2a3LPC0R4+8uXCu6qda6CcbY+Ji+3JQ@mail.gmail.com> (raw)
In-Reply-To: <20190321080614.jmpycfyetz4rugui@pengutronix.de>
Hi,
I recently tried to compile the barebox bootloaer with the
arm-cortex_a8-linux-gnueabihf configuration which is based on the
sample configuration arm-cortex_a8-linux-gnueabi with the hardware
float enabled.
However, the compiler (gcc) seems not support -march=armv7-a flag. I
think something is wrong as the cortex_a8 is a sub-architecture of
armv7-a.
The toolchain failed to compile both the barebox and the linux kernel
(4.19). Please help! Attached is a response from the barebox mailing
list.
Kind regards,
Lewis
---------- Forwarded message ---------
From: Sascha Hauer <s.hauer@pengutronix.de>
Date: Thu, Mar 21, 2019 at 4:06 PM
Subject: Re: selected processor does not support `rev r7,r7'
To: Lewis Zhou <lewisou@gmail.com>
Cc: <barebox@lists.infradead.org>
On Thu, Mar 21, 2019 at 03:53:06PM +0800, Lewis Zhou wrote:
> Hi Sascha,
>
> Here's the log:
>
> make -f scripts/Makefile.build obj=common
>
> arm-cortex_a8-linux-gnueabihf-gcc -Wp,-MD,common/.memory.o.d
> -nostdinc -isystem
> /home/lewis/x-tools/arm-cortex_a8-linux-gnueabihf/lib/gcc/arm-cortex_a8-linux-gnueabihf/8.3.0/include
> -D__KERNEL__ -D__BAREBOX__ -Iinclude
> -I/home/lewis/OpenProj/barebox/dts/include
> -I/home/lewis/OpenProj/barebox/arch/arm/include
> -I/home/lewis/OpenProj/barebox/arch/arm/include -include
> /home/lewis/OpenProj/barebox/include/linux/kconfig.h -fno-builtin
> -ffreestanding -D__ARM__ -fno-strict-aliasing -marm -mlittle-endian
> -mabi=aapcs-linux -mno-thumb-interwork -D__LINUX_ARM_ARCH__=7
> -march=armv5t -Wa,-march=armv7-a -msoft-float -mthumb
-march=armv5t -Wa,-march=armv7-a shouldn't be here. It comes from this
line in arch/arm/Makefile:
arch-$(CONFIG_CPU_32v7) :=-D__LINUX_ARM_ARCH__=7 $(call
cc-option,-march=armv7-a,-march=armv5t -Wa$(comma)-march=armv7-a)
This means the build process will use "-march=armv7-a" when the compiler
supports it. Apparently it does not, so it will fall back to
"-march=armv5t -Wa,-march=armv7-a". armv5t doesn't support thumb2 code,
only thumb and as it seems thumb does not support the "rev" instruction.
Your compiler should really support "-march=armv7-a". If it doesn't I
really think there is something wrong with it.
Sascha
--
Pengutronix e.K. | |
Industrial Linux Solutions | http://www.pengutronix.de/ |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 |
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next parent reply other threads:[~2019-03-21 8:24 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CAD_Pvub19JJgwwkZrNX7iz47f-jib5hiUgE+8Z=2cSf80=YygQ@mail.gmail.com>
[not found] ` <20190320075215.7j36mofzoewd5qfa@pengutronix.de>
[not found] ` <CAD_PvuYxnQJT7VVe0DKRZa-VHJN+Rz-tb9KLudtd+My8CBXhLg@mail.gmail.com>
[not found] ` <20190321073332.b3725avve4p6ascg@pengutronix.de>
[not found] ` <CAD_PvubAaFD=zJVrzpjq__F2Qre4XedjE8op_1GAQcf19jYOrg@mail.gmail.com>
[not found] ` <20190321080614.jmpycfyetz4rugui@pengutronix.de>
2019-03-21 8:24 ` Lewis Zhou [this message]
2019-03-21 8:40 ` Austin Morton
[not found] ` <CAD_PvuaROBDHod3XjFFgZ6Qic3pHhRSP=qFbQ5MHwGJs=js+0g@mail.gmail.com>
2019-03-21 9:15 ` Austin Morton
[not found] ` <CAD_Pvub+CwCM_ys72JiQ9jgQ_Gz=+qdsz7o2MK-6nV7icfSzZQ@mail.gmail.com>
[not found] ` <CAD_Pvua_tQ2qe2297bfGvS2ekDz2_StM4WbhiBy=yLVVHokS-A@mail.gmail.com>
2019-03-22 4:01 ` Austin Morton
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