linux-kernel - Re: [PATCH] ARM: at91: add Acme Systems Aria G25 board

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Date:	Mon, 25 Mar 2013 08:33:55 -0400
From:	Douglas Gilbert <dgilbert@...erlog.com>
To:	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
CC:	Nicolas Ferre <nicolas.ferre@...el.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Ludovic Desroches <ludovic.desroches@...el.com>,
	tanzilli@...esystems.it, Robert.Nelson@...ikey.com
Subject: Re: [PATCH] ARM: at91: add Acme Systems Aria G25 board

On 13-03-25 08:22 AM, Jean-Christophe PLAGNIOL-VILLARD wrote:
> On 09:49 Mon 25 Mar     , Nicolas Ferre wrote:
>> From: Douglas Gilbert <dgilbert@...erlog.com>
>>
>> Signed-off-by: Douglas Gilbert <dgilbert@...erlog.com>
>> Signed-off-by: Nicolas Ferre <nicolas.ferre@...el.com>
>> ---
>>   arch/arm/boot/dts/ariag25.dts | 168 ++++++++++++++++++++++++++++++++++++++++++
>>   1 file changed, 168 insertions(+)
>>   create mode 100644 arch/arm/boot/dts/ariag25.dts
>>
>> diff --git a/arch/arm/boot/dts/ariag25.dts b/arch/arm/boot/dts/ariag25.dts
>> new file mode 100644
>> index 0000000..d18ef50
>> --- /dev/null
>> +++ b/arch/arm/boot/dts/ariag25.dts
>> @@ -0,0 +1,168 @@
>> +/*
>> + * ariag25.dts - Device Tree file for Acme Systems Aria G25 (AT91SAM9G25 based)
>> + *
>> + * Copyright (C) 2013 Douglas Gilbert <dgilbert@...erlog.com>,
>> + *                    Robert Nelson <robertcnelson@...il.com>
>> + *
>> + * Licensed under GPLv2 or later.
>> + */
>> +/dts-v1/;
>> +/include/ "at91sam9g25.dtsi"
>> +
>> +/ {
>> +	model = "Acme Systems Aria G25";
>> +	compatible = "acme,ariag25", "atmel,at91sam9g25ek", "atmel,at91sam9x5ek",
>> +		     "atmel,at91sam9x5", "atmel,at91sam9";
> I doube the code is compatible with the 9g25ek
>
> specially when you do not include it
>> +
>> +	aliases {
>> +		serial4 = &usart3;
>> +		serial5 = &uart0;
>> +	};
> you need to specify all
>> +
>> +	chosen {
>> +		bootargs = "console=ttyS0,115200 root=/dev/mmcblk0p2 rw rootwait";
>> +	};
>> +
>> +	memory {
>> +		/* 128 MB, change this for 256 MB revision */
>> +		reg = <0x20000000 0x8000000>;
>> +	};
>> +
>> +	clocks {
>> +		#address-cells = <1>;
>> +		#size-cells = <1>;
>> +		ranges;
>> +
>> +		main_clock: clock@0 {
>> +			compatible = "atmel,osc", "fixed-clock";
>> +			clock-frequency = <12000000>;
>> +		};
>> +	};
>> +
>> +	ahb {
>> +		apb {
>> +			mmc0: mmc@...08000 {
>> +				/* N.B. Aria has no SD card detect (CD), assumed present */
>> +
>> +				pinctrl-0 = <
>> +					&pinctrl_mmc0_slot0_clk_cmd_dat0
>> +					&pinctrl_mmc0_slot0_dat1_3>;
>> +				status = "okay";
>> +				slot@0 {
>> +					reg = <0>;
>> +					bus-width = <4>;
>> +				};
>> +			};
>> +
>> +			i2c0: i2c@...10000 {
>> +				status = "okay";
>> +			};
>> +
>> +			i2c1: i2c@...14000 {
>> +				status = "okay";
>> +			};
>> +
>> +			/* TWD2+TCLK2 hidden behind ethernet, so no i2c2 */
>> +
>> +			usart0: serial@...1c000 {
>> +				pinctrl-0 = <&pinctrl_usart0
>> +					     &pinctrl_usart0_rts
>> +					     &pinctrl_usart0_cts>;
>> +				status = "okay";
>> +			};
>> +
>> +			usart1: serial@...20000 {
>> +				pinctrl-0 = <&pinctrl_usart1
>> +					     /* &pinctrl_usart1_rts */
>> +					     /* &pinctrl_usart1_cts */
>> +					    >;
>> +				status = "okay";
>> +			};
>> +
>> +			usart2: serial@...24000 {
>> +				/* cannot activate RTS2+CTS2, clash with
>> +				 * ethernet on PB0 and PB1 */
>> +				pinctrl-0 = <&pinctrl_usart2>;
>> +				status = "okay";
>> +			};
>> +
>> +			usart3: serial@...28000 {
>> +				compatible = "atmel,at91sam9260-usart";
>> +				reg = <0xf8028000 0x200>;
>> +				interrupts = <8 4 5>;
>> +				pinctrl-names = "default";
>> +				pinctrl-0 = <&pinctrl_usart3
>> +					     /* &pinctrl_usart3_rts */
>> +					     /* &pinctrl_usart3_cts */
>> +					    >;
>> +				status = "okay";
>> +			};
>> +
>> +			macb0: ethernet@...2c000 {
>> +				phy-mode = "rmii";
>> +				/* following can be overwritten by uboot 'ftd set' command */
>> +				local-mac-address = [00 04 25 dd 10 01];
> drop this, this is board specific
>> +				status = "okay";

Why not leave it but change the data to 00 00 00 00 00 00.
It is a useful technique and really hard to find.

Trying to find a Linux embedded system with an IP address
the jumps around (because it finds a 00 00 00 00 00 00 MAC
address) can be very frustrating. Showing folks where they
can give a non-NULL MAC address may save a lot of frustration.

Doug Gilbert


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