[U-Boot] [PATCH v2] ARM: move -march=* and -mtune= options to arch/arm/Makefile

[Jan Kiszka <jan.kiszka@web.de>]

On 2015-04-11 05:49, Stephen Warren wrote:
> On 03/27/2015 11:06 AM, Albert ARIBAUD wrote:
>> On Fri, 27 Feb 2015 02:40:33 +0900, Masahiro Yamada <yamada.m@jp.panasonic.com> wrote:
>>> My main motivations for this commit are:
>>>
>>> [1] Follow the arch/arm/Makefile style of Linux Kernel
>>>
>>> [2] Maintain compiler options systematically
>>>   Currently, we give -march=* and -mtune=* options inconsistently:
>>>   Only some of the CPUs pass -march=* and -mtune=* options.
>>>   By collecting such options into the single place arch/arm/Makefile
>>>   we can tell which options are missing at a glance.
>>>
>>> [3] Prepare for deprecating arch/*/cpu/*/config.mk
>>>
>>> Note:
>>>   This commit just moves the compiler options so as not to change
>>>   the behavior at all.  It does not care about the correctness of
>>>   the given options.  Fox example, "-march=armv5te" might be better
>>>   than "-march=armv4" for ARM946EJS, but it is beyond the scope this
>>>   commit.  Also, filling the missing -march=* and -tune=* is left
>>>   to follow-up patches.
> ...
>> Applied to u-boot-arm/master, thanks!
> 
> This patch breaks Tegra (at least Seaboard, and I'd guess all Tegra
> boards). Reverting it solves the problem.

Yes, just bisected the same problem on the TK1 down to this commit.

> 
> It causes the SPL to be build for ARMv7 even though it should be built
> for an earlier architecture. I added a $(warning) to arch/arm/Makefile,
> and it prints:
> 
> arch/arm/Makefile:37: SPL_BUILD  FLAGS  -D__ARM__ -marm
> -mno-thumb-interwork  -mabi=aapcs-linux  -mword-relocations
> -mno-unaligned-access  -ffunction-sections -fdata-sections -fno-common
> -ffixed-r9  -msoft-float  -pipe  -march=armv7-a
> 
> arch/arm/Makefile:37: SPL_BUILD y FLAGS  -D__ARM__ -marm
> -mno-thumb-interwork  -mabi=aapcs-linux  -ffunction-sections
> -fdata-sections -fno-common -ffixed-r9  -msoft-float  -pipe  -march=armv7-a
> 
> Note the second line says ARMv7, even though CONFIG_SPL_BUILD is set, so
> it shouldn't.
> 

Tegra seems to be the only target so far that changes the target CPU for
the SPL build:

#config.mk
...
ARCH := $(CONFIG_SYS_ARCH:"%"=%)
CPU := $(CONFIG_SYS_CPU:"%"=%)
ifdef CONFIG_SPL_BUILD
ifdef CONFIG_TEGRA
CPU := arm720t
endif
endif
...

How to model this with that new compiler switch setup?

Jan

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