Re: [PATCH 1/9] arm: select different compiler flags for ARM CortexM3

From: Russell King - ARM Linux
Date: Tue Jun 23 2015 - 17:48:52 EST

On Tue, Jun 23, 2015 at 11:19:39PM +0200, Paul Osmialowski wrote:
> This one is inspired by two commits published on Emcraft git repo:
> 1) 6302b692f570ff9d5645a6e72c11f87b0c1aa409
> RT #62654. Fixed kernel crashes while running httpd by enabling
> "-mfix-cortex-m3-ldrd" compiler option, which prevents compiler from
> generating code like 'ldrd Ra, Rb, [Ra, #Imm]' - according to the 602117
> Cortex-M3 Errata it may result in incorrect base register when interrupted
> or faulted.
> by: Yuri Tikhonov <yur@xxxxxxxxxxx>
> 2) 359d3cda84c01c0f3fae1a519b97a31f318f57ab
> RT #62654. Removed "--march=..." leaving only "-mcpu=cortex-m3" to make
> sure only the correct instructions will be generated.
> by: Sergei Poselenov <sposelenov@xxxxxxxxxxx>
> I reworked these patches to make them less intrusive.
> Signed-off-by: Paul Osmialowski <pawelo@xxxxxxxxxxx>


The EFM32 code already added core support for Cortex-M3 cores, under
the symbol CPU_V7M. Rather than implementing a whole new set of
Cortex-M3 support alongside the existing code, please work with the
EFM32 maintainer (Uwe Kleine-König) to come up with a common set of
core changes that you can all agree on for Cortex-M3.

Please also try to be a little smarter with whom you're sending your
patches to, the Cc list looks to be excessively long - having soo many
recipients on your message is a good way to get your message rejected
by mailing lists as spam.

FTTC broadband for 0.8mile line: currently at 10.5Mbps down 400kbps up
according to
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