linux-kernel - Re: [PATCH v1] ARM: zynq: Fix earlyprintk in big endian mode

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Message-ID: <5579CFCC.60905@xilinx.com>
Date:	Thu, 11 Jun 2015 20:13:32 +0200
From:	Michal Simek <michal.simek@...inx.com>
To:	Arun Chandran <achandran@...sta.com>,
	Michal Simek <michal.simek@...inx.com>
CC:	<linux-kernel@...r.kernel.org>, Michal Simek <monstr@...str.eu>,
	Sören Brinkmann <soren.brinkmann@...inx.com>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v1] ARM: zynq: Fix earlyprintk in big endian mode

On 06/10/2015 04:13 PM, Arun Chandran wrote:
> earlyprintk messages are not appearing on the terminal
> emulator during a big endian kernel boot. If we
> byte swap the sending data it comes properly.
> 
> Signed-off-by: Arun Chandran <achandran@...sta.com>
> ---
> ---
> This can be tested by adding 'early_print("early print test\n");'
> to setup_arch() in arch/arm/kernel/setup.c
> ---
>  arch/arm/include/debug/zynq.S | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm/include/debug/zynq.S b/arch/arm/include/debug/zynq.S
> index bd13ded..0d274fe 100644
> --- a/arch/arm/include/debug/zynq.S
> +++ b/arch/arm/include/debug/zynq.S
> @@ -38,6 +38,7 @@
>  		.endm
>  
>  		.macro	senduart,rd,rx
> +ARM_BE8(	rev	\rd, \rd )
>  		str	\rd, [\rx, #UART_FIFO_OFFSET]	@ TXDATA
>  		.endm
>  
> 

Tested-by: Michal Simek <michal.simek@...inx.com>

Thanks,
Michal
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