From c176dd0442c40d4e98c86848091f628707f9c50a Mon Sep 17 00:00:00 2001 From: Jon Hunter Date: Tue, 1 May 2012 10:05:08 +0000 Subject: [PATCH] OMAP4: Set fdt_high for OMAP4 devices to enable booting with Device Tree For OMAP4 boards, such as the panda-es, that have 1GB of memory the linux kernel fails to locate the device tree blob on boot. The reason being is that u-boot is copying the DT blob to the upper part of RAM when booting the kernel and the kernel is unable to access the blob. By setting the fdt_high variable to either 0xffffffff (to prevent the copy) or 0xac000000 (704MB boundary of memory for OMAP4) the kernel is able to locate the DT blob and boot. Based upon following patch by Dirk Behme set the fdt_high variable to allow booting with device tree on OMAP4 boards. "7e9603e i.mx6q: configs: Add fdt_high and initrd_high variables" Cc: Sricharan R Cc: Sandeep Paulraj Cc: Tom Rini Signed-off-by: Jon Hunter --- include/configs/omap4_common.h | 1 + 1 file changed, 1 insertion(+) diff --git a/include/configs/omap4_common.h b/include/configs/omap4_common.h index 5507c8f4c6..072e17bab8 100644 --- a/include/configs/omap4_common.h +++ b/include/configs/omap4_common.h @@ -149,6 +149,7 @@ #define CONFIG_EXTRA_ENV_SETTINGS \ "loadaddr=0x82000000\0" \ "console=ttyO2,115200n8\0" \ + "fdt_high=0xffffffff\0" \ "usbtty=cdc_acm\0" \ "vram=16M\0" \ "mmcdev=0\0" \