linux-kernel - Re: [PATCH] ARM: debug-ll: add default address for digicolor

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Date:   Wed, 17 Apr 2019 07:12:50 +0300
From:   Baruch Siach <baruch@...s.co.il>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     arm@...nel.org, linux-arm-kernel@...ts.infradead.org,
        Russell King <linux@...linux.org.uk>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: debug-ll: add default address for digicolor

Hi Arnd,

On Tue, Apr 16, 2019 at 03:17:30PM +0200, Arnd Bergmann wrote:
> The digicolor platform has three UARTs, but the Kconfig.debug
> file explicitly lists port zero as the one to be used for the
> console, while not providing any default values.
> 
> This can get an automated randconfig build stuck in a loop
> waiting for the user to input the number. As we already know
> the physical address, this patch provides that number as
> default, along with a reasonable default value for the virtual
> address.
> 
> Cc: Baruch Siach <baruch@...s.co.il>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  arch/arm/Kconfig.debug | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
> index a8a1e14f20ab..e5f0b36d797f 100644
> --- a/arch/arm/Kconfig.debug
> +++ b/arch/arm/Kconfig.debug
> @@ -1676,6 +1676,7 @@ config DEBUG_UART_PHYS
>  	default 0xe6e68000 if DEBUG_RCAR_GEN2_SCIF1
>  	default 0xe6ee0000 if DEBUG_RCAR_GEN2_SCIF4
>  	default 0xe8008000 if DEBUG_R7S72100_SCIF2
> +	default 0xf0000740 if DEBUG_DIGICOLOR_UA0

The addruart macro in arch/arm/include/debug/digicolor.S adds the 0x740 offset. 
So CONFIG_DEBUG_UART_PHYS should be 0xf0000000.

>  	default 0xf0000be0 if ARCH_EBSA110
>  	default 0xf1012000 if DEBUG_MVEBU_UART0_ALTERNATE
>  	default 0xf1012100 if DEBUG_MVEBU_UART1_ALTERNATE
> @@ -1785,6 +1786,7 @@ config DEBUG_UART_VIRT
>  	default 0xfd012000 if DEBUG_MVEBU_UART0_ALTERNATE && ARCH_MV78XX0
>  	default 0xfd883000 if DEBUG_ALPINE_UART0
>  	default 0xfde12000 if DEBUG_MVEBU_UART0_ALTERNATE && ARCH_DOVE
> +	default 0xfe000740 if DEBUG_DIGICOLOR_UA0

The value I used when testing used to be 0xf0100000.

>  	default 0xfe012000 if DEBUG_MVEBU_UART0_ALTERNATE && ARCH_ORION5X
>  	default 0xfe017000 if DEBUG_MMP_UART2
>  	default 0xfe018000 if DEBUG_MMP_UART3

Thanks,
baruch

-- 
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