From: Tom Rini <trini@konsulko.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH 1/4] arm: make sure board_init_r() is being called using the right mode (ARM / THUMB)
Date: Wed, 10 Feb 2016 17:12:45 -0500 [thread overview]
Message-ID: <20160210221245.GL23166@bill-the-cat> (raw)
In-Reply-To: <56BAED72.9090901@elsoft.ch>
On Wed, Feb 10, 2016 at 08:57:38AM +0100, David M?ller (ELSOFT AG) wrote:
> Hello
>
> Tom Rini wrote:
> > On Tue, Feb 09, 2016 at 04:48:28PM +0100, David M?ller wrote:
> >> /* call board_init_r */
> >> +#if defined(CONFIG_SYS_THUMB_BUILD)
> >> + ldr lr, =board_init_r /* this is auto-relocated! */
> >> + bx lr
> >> +#else
> >> ldr pc, =board_init_r /* this is auto-relocated! */
> >> -
> >> +#endif
> >> /* we should not return here. */
> >> #endif
> >
> > In general, my preference is always to use the thumb compatible way, can
> > you rework like that and explain in the commit message? Thanks!
>
> AFAIK, the "bx" instruction is undefined on non-THUMB capable
> architectures. I therefore don't see a way to avoid some kind of
> #if/#else/#endif construct.
Ah, OK, nevermind then, thanks.
--
Tom
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next prev parent reply other threads:[~2016-02-10 22:12 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-09 15:48 [U-Boot] [PATCH 0/4] Use THUMB mode for VCMA9 U-Boot builts David Müller
2016-02-09 15:48 ` [U-Boot] [PATCH 1/4] arm: make sure board_init_r() is being called using the right mode (ARM / THUMB) David Müller
2016-02-09 17:03 ` Tom Rini
2016-02-10 7:57 ` David Müller (ELSOFT AG)
2016-02-10 22:12 ` Tom Rini [this message]
2016-02-15 22:35 ` [U-Boot] [U-Boot, " Tom Rini
2016-02-09 15:48 ` [U-Boot] [PATCH 2/4] arm: the ARM920T is THUMB capable, so select the appropriate ISA David Müller
2016-02-15 22:35 ` [U-Boot] [U-Boot, " Tom Rini
2016-02-09 15:48 ` [U-Boot] [PATCH 3/4] arm: build some file(s) as ARM mode only David Müller
2016-02-15 22:35 ` [U-Boot] [U-Boot,3/4] " Tom Rini
2016-02-09 15:48 ` [U-Boot] [PATCH 4/4] arm: VCMA9: because of NOR flash space constrains, activate THUMB build mode David Müller
2016-02-15 22:35 ` [U-Boot] [U-Boot, " Tom Rini
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