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Message-ID: <51505AE7.1010208@atmel.com>
Date: Mon, 25 Mar 2013 15:10:47 +0100
From: Nicolas Ferre <nicolas.ferre@...el.com>
To: <dgilbert@...erlog.com>,
Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
CC: <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 03/25/2013 02:48 PM, Douglas Gilbert :
> 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 :-)
Absolutely: for all those reasons (the strongest one beeing: it is so
simple), I won't modify this part.
Bye,
--
Nicolas Ferre
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