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

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Date:	Mon, 25 Mar 2013 09:48:13 -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";

Also the local-mac-address line is needed since it is edited
by u-boot via this line:

mod_dtb=fdt addr 0x27FF0000 ; fdt set ${eth0_dt_path} local-mac-address [ 
${my_ethaddr} ]

Interesting technique that: editing the dtb from u-boot prior to the
Linux kernel using it ...

So the u-boot environment file actually sets the MAC address. The Aria
G25 has no NAND, flash or switches for setting a quasi unique MAC
address. There seems to be no way to pass the MAC address on the
kernel boot line (there was in the past). That leaves the microSD card
and IMO u-boot is the best place to set that MAC address. My guess
is that the Aria G25 is not the only board that has this "setting the
MAC address" challenge.

Finally of course that line is "board specific", that is why the
file is called ariag25.dts :-)

Doug Gilbert



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