linux-kernel - Re: [PATCH] ARM: OMAP5: Switch to THUMB mode if needed on secondary CPU

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Date:	Tue, 22 Apr 2014 14:39:37 -0400
From:	Santosh Shilimkar <santosh.shilimkar@...com>
To:	Joel Fernandes <joelf@...com>,
	Linux OMAP List <linux-omap@...r.kernel.org>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
CC:	Russell King <linux@....linux.org.uk>, Nishanth Menon <nm@...com>,
	Tony Lindgren <tony@...mide.com>
Subject: Re: [PATCH] ARM: OMAP5: Switch to THUMB mode if needed on secondary
 CPU

On Tuesday 22 April 2014 02:31 PM, Joel Fernandes wrote:
> On my DRA7 system, when the kernel is built in THUMB mode, the secondary CPU
> (Cortex A15) fails to come up causing SMP boot on second CPU to timeout. This
> seems to be because the CPU is in ARM mode once the ROM hands over control to
> the kernel.  Switch to THUMB mode if required once the kernel is control of
> secondary CPU. On OMAP4 on the other hand, it appears to be in THUMB mode on
> entry so this is not required and SMP boot works as is.
> 
> Cc: Santosh Shilimkar <santosh.shilimkar@...com>
> Cc: Russell King <linux@....linux.org.uk>
> Cc: Nishanth Menon <nm@...com>
> Cc: Tony Lindgren <tony@...mide.com>
> Signed-off-by: Joel Fernandes <joelf@...com>
> ---
>  arch/arm/mach-omap2/omap-headsmp.S |    8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
Looks fine to me ..
Acked-by: Santosh Shilimkar <santosh.shilimkar@...com>


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