From: Allen Martin <amartin@nvidia.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH v2 8/9] arm: use thumb interworking returns in libgcc
Date: Wed, 1 Aug 2012 15:28:48 -0700 [thread overview]
Message-ID: <20120801222847.GA7791@nvidia.com> (raw)
In-Reply-To: <CAM=4YETBJLDgoG7Z-2dBy3vN50uei7sN7FfF-6V8_GvK93GfZQ@mail.gmail.com>
On Wed, Aug 01, 2012 at 03:15:45PM -0700, V, Aneesh wrote:
> > I didn't want to break any older ARM architectures that don't support the
> > bx instruction but use this code.
>
>
> Which is earlier than armv4t, right? On quick look it didn't seem there is anything
> older than that in u-boot. But yes, it's perhaps better to be safe.
Yes, in particular bx is available in armv4t but not armv4, and there
are architectures being compiled -march=armv4 in u-boot:
$ grep march arch/arm/cpu/*/config.mk
arch/arm/cpu/arm1136/config.mk:PLATFORM_CPPFLAGS += -march=armv5
arch/arm/cpu/arm1176/config.mk:PLATFORM_CPPFLAGS += -march=armv5t
arch/arm/cpu/arm720t/config.mk:PLATFORM_CPPFLAGS += -march=armv4
-mtune=arm7tdmi
arch/arm/cpu/arm920t/config.mk:PLATFORM_CPPFLAGS += -march=armv4
arch/arm/cpu/arm925t/config.mk:PLATFORM_CPPFLAGS += -march=armv4
arch/arm/cpu/arm926ejs/config.mk:PLATFORM_CPPFLAGS += -march=armv5te
arch/arm/cpu/arm946es/config.mk:PLATFORM_CPPFLAGS += -march=armv4
arch/arm/cpu/arm_intcm/config.mk:PLATFORM_CPPFLAGS += -march=armv4
arch/arm/cpu/armv7/config.mk:PF_CPPFLAGS_ARMV7 := $(call cc-option,
-march=armv7-a, -march=armv5)
arch/arm/cpu/ixp/config.mk:PLATFORM_CPPFLAGS += -mbig-endian
-march=armv5te -mtune=strongarm1100
arch/arm/cpu/lh7a40x/config.mk:PLATFORM_CPPFLAGS += -march=armv4
arch/arm/cpu/pxa/config.mk:PLATFORM_CPPFLAGS += -march=armv5te
-mtune=xscale
arch/arm/cpu/s3c44b0/config.mk:PLATFORM_CPPFLAGS += -march=armv4
-mtune=arm7tdmi -msoft-float
arch/arm/cpu/sa1100/config.mk:PLATFORM_CPPFLAGS += -march=armv4
-mtune=strongarm1100
Probably some of these are actually armv4t, but I don't want to touch
them :^)
-Allen
--
nvpublic
next prev parent reply other threads:[~2012-08-01 22:28 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-01 20:32 [U-Boot] [PATCH v2 0/9] enable thumb for tegra20 Allen Martin
2012-08-01 20:32 ` [U-Boot] [PATCH v2 1/9] tools, config.mk: add binutils-version Allen Martin
2012-08-01 20:32 ` [U-Boot] [PATCH v2 2/9] arm: work around assembler bug Allen Martin
2012-08-01 20:32 ` [U-Boot] [PATCH v2 3/9] tegra20: remove inline assembly for u32 cast Allen Martin
2012-08-01 20:32 ` [U-Boot] [PATCH v2 4/9] arm: add _thumb1_case_uqi to libgcc Allen Martin
2012-08-13 23:44 ` Stephen Warren
2012-08-14 0:36 ` Allen Martin
2012-08-14 2:39 ` V, Aneesh
2012-08-14 16:02 ` Stephen Warren
2012-08-01 20:32 ` [U-Boot] [PATCH v2 5/9] arm: use thumb compatible return in arm720t Allen Martin
2012-08-01 20:32 ` [U-Boot] [PATCH v2 6/9] arm: change arm720t to armv4t Allen Martin
2012-08-01 20:32 ` [U-Boot] [PATCH v2 7/9] arm720t: add linkage macro for relocate_code Allen Martin
2012-08-01 20:32 ` [U-Boot] [PATCH v2 8/9] arm: use thumb interworking returns in libgcc Allen Martin
2012-08-01 21:11 ` V, Aneesh
2012-08-01 21:55 ` Allen Martin
2012-08-01 22:15 ` V, Aneesh
2012-08-01 22:28 ` Allen Martin [this message]
2012-08-01 20:32 ` [U-Boot] [PATCH v2 9/9] tegra20: enable thumb build Allen Martin
2012-08-13 21:21 ` [U-Boot] [PATCH v2 0/9] enable thumb for tegra20 Stephen Warren
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