On 9/24/2011 1:21 AM, Grant Likely wrote:

On Fri, Sep 23, 2011 at 10:23:11PM +0200, Benoit Cousson wrote:

quoted

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<redacted>
Cc: Grant Likely<redacted>
Cc: G, Manjunath Kondaiah<redacted>
---
  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