Subject: [PATCH 03/11] arm/dts: Add support for OMAP4 PandaBoard

From: [email-masked] (Cousson, Benoit)
Date: Mon, 26 Sep 2011 14:38:10 +0200

On 9/24/2011 1:21 AM, Grant Likely wrote:
> On Fri, Sep 23, 2011 at 10:23:11PM +0200, Benoit Cousson wrote:
>> Based on the original omap4-panda.dts file from Manju.
>> http://www.spinics.net/lists/linux-omap/msg55836.html
>>
>> Add memory information and a default bootargs to allow
>> a boot from RAMDISK.
>>
>> Signed-off-by: Benoit Cousson<[email-masked]>
>> Cc: Grant Likely<[email-masked]>
>> Cc: G, Manjunath Kondaiah<[email-masked]>
>> ---
>>   arch/arm/boot/dts/omap4-panda.dts |   29 +++++++++++++++++++++++++++++
>>   1 files changed, 29 insertions(+), 0 deletions(-)
>>   create mode 100644 arch/arm/boot/dts/omap4-panda.dts
>>
>> diff --git a/arch/arm/boot/dts/omap4-panda.dts b/arch/arm/boot/dts/omap4-panda.dts
>> new file mode 100644
>> index 0000000..c702657
>> --- /dev/null
>> +++ b/arch/arm/boot/dts/omap4-panda.dts
>> @@ -0,0 +1,29 @@
>> +/*
>> + * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License version 2 as
>> + * published by the Free Software Foundation.
>> + */
>> +/dts-v1/;
>> +
>> +/include/ "omap4.dtsi"
>> +
>> +/ {
>> +	model = "TI OMAP4 PandaBoard";
>> +	compatible = "ti,omap4-panda", "ti,omap4430", "ti,omap4";
>> +
>> +	/*
>> +	 * Since the initial device tree board file does not create any
>> +	 * devices (MMC, network...), the only way to boot is to provide a
>> +	 * ramdisk.
>> +	 */
>> +	chosen {
>> +		bootargs = "root=/dev/ram0 rw console=ttyO2,115200n8 initrd=0x81600000,20M ramdisk_size=20480 no_console_suspend debug";
>
> Generally, we don't want bootargs in the .dts files; we want them
> added to the .dtb by the boot firmware.  However, we are bootstrapping
> here, so I'm okay with it in the short term until firmware matures a
> bit more.

Yeah, I had to to that because an old uboot with appended dtb seems to 
ignore the original bootargs.

Benoit