* [U-Boot] Undefined results when building highbank board
@ 2012-04-26 12:03 Wolfgang Denk
2012-04-26 12:54 ` Rob Herring
0 siblings, 1 reply; 3+ messages in thread
From: Wolfgang Denk @ 2012-04-26 12:03 UTC (permalink / raw)
To: u-boot
Dear Rob,
arch/arm/cpu/armv7/highbank/config.mk contains this setting:
PLATFORM_CPPFLAGS += -march=armv7-a
This results in code bueing built with the follwoing compiler options:
... -march=armv5 -march=armv7-a ...
This is a bad idea - dependign on tool chain used, this may result in
compiler errors ("error: bad value (armv7-a) for -march= switch"), or
undefined behaviour, as it is not clear which option is used by the
compiler.
Can you please provide a fix? Thanks!
Best regards,
Wolfgang Denk
--
DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
The philosophy exam was a piece of cake - which was a bit of a
surprise, actually, because I was expecting some questions on a sheet
of paper.
^ permalink raw reply [flat|nested] 3+ messages in thread* [U-Boot] Undefined results when building highbank board
2012-04-26 12:03 [U-Boot] Undefined results when building highbank board Wolfgang Denk
@ 2012-04-26 12:54 ` Rob Herring
2012-04-26 20:33 ` Wolfgang Denk
0 siblings, 1 reply; 3+ messages in thread
From: Rob Herring @ 2012-04-26 12:54 UTC (permalink / raw)
To: u-boot
On 04/26/2012 07:03 AM, Wolfgang Denk wrote:
> Dear Rob,
>
> arch/arm/cpu/armv7/highbank/config.mk contains this setting:
>
> PLATFORM_CPPFLAGS += -march=armv7-a
>
> This results in code bueing built with the follwoing compiler options:
>
> ... -march=armv5 -march=armv7-a ...
>
> This is a bad idea - dependign on tool chain used, this may result in
> compiler errors ("error: bad value (armv7-a) for -march= switch"), or
> undefined behaviour, as it is not clear which option is used by the
> compiler.
>
> Can you please provide a fix? Thanks!
The issue is I require a wfi assembly instruction for reset, so I would
have to hard code the machine code to work on all compilers.
Rob
>
> Best regards,
>
> Wolfgang Denk
>
^ permalink raw reply [flat|nested] 3+ messages in thread* [U-Boot] Undefined results when building highbank board
2012-04-26 12:54 ` Rob Herring
@ 2012-04-26 20:33 ` Wolfgang Denk
0 siblings, 0 replies; 3+ messages in thread
From: Wolfgang Denk @ 2012-04-26 20:33 UTC (permalink / raw)
To: u-boot
Dear Rob Herring,
In message <4F99459F.4060500@gmail.com> you wrote:
>
> > Can you please provide a fix? Thanks!
>
> The issue is I require a wfi assembly instruction for reset, so I would
> have to hard code the machine code to work on all compilers.
If it's only for this single instruction that thi sseems to be not so
bad an option.
Thanks.
Best regards,
Wolfgang Denk
--
DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
Computers are not intelligent. They only think they are.
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2012-04-26 20:33 UTC | newest]
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2012-04-26 12:03 [U-Boot] Undefined results when building highbank board Wolfgang Denk
2012-04-26 12:54 ` Rob Herring
2012-04-26 20:33 ` Wolfgang Denk
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