[U-Boot] [PATCH] OMAP4: Set fdt_high for OMAP4 devices to enable booting with Device Tree

[U-Boot] [PATCH] OMAP4: Set fdt_high for OMAP4 devices to enable booting with Device Tree

[Jon Hunter]

From: Jon Hunter <jon-hunter@ti.com>

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 <r.sricharan@ti.com>
Cc: Sandeep Paulraj <s-paulraj@ti.com>
Cc: Tom Rini <trini@ti.com>
Signed-off-by: Jon Hunter <jon-hunter@ti.com>
---
 include/configs/omap4_common.h |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/include/configs/omap4_common.h b/include/configs/omap4_common.h
index a989721..d31cbb5 100644
--- a/include/configs/omap4_common.h
+++ b/include/configs/omap4_common.h
@@ -151,6 +151,7 @@
 #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" \
-- 
1.7.5.4

[U-Boot] [PATCH] OMAP4: Set fdt_high for OMAP4 devices to enable booting with Device Tree

[R, Sricharan]

Jon,
[snip]

> --- a/include/configs/omap4_common.h
> +++ b/include/configs/omap4_common.h
> @@ -151,6 +151,7 @@
> ?#define CONFIG_EXTRA_ENV_SETTINGS \
> ? ? ? ?"loadaddr=0x82000000\0" \
> ? ? ? ?"console=ttyO2,115200n8\0" \
> + ? ? ? "fdt_high=0xffffffff\0" \

 Tested this on mainline and worked fine on 4430SDP.

 Tested the same on u-boot-arm, but did not work there.
 Not sure what i am missing.

Thanks,
 Sricharan

[U-Boot] [PATCH] OMAP4: Set fdt_high for OMAP4 devices to enable booting with Device Tree

[Jon Hunter]

From: Jon Hunter <jon-hunter@ti.com>

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 <r.sricharan@ti.com>
Cc: Sandeep Paulraj <s-paulraj@ti.com>
Cc: Tom Rini <trini@ti.com>
Signed-off-by: Jon Hunter <jon-hunter@ti.com>
---
 include/configs/omap4_common.h |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/include/configs/omap4_common.h b/include/configs/omap4_common.h
index a989721..d31cbb5 100644
--- a/include/configs/omap4_common.h
+++ b/include/configs/omap4_common.h
@@ -151,6 +151,7 @@
 #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" \
-- 
1.7.5.4

[U-Boot] [PATCH] OMAP4: Set fdt_high for OMAP4 devices to enable booting with Device Tree

[Jon Hunter]

Hi Sricharan,

On 05/04/2012 06:20 AM, R, Sricharan wrote:
> Jon,
> [snip]
> 
>> --- a/include/configs/omap4_common.h
>> +++ b/include/configs/omap4_common.h
>> @@ -151,6 +151,7 @@
>>  #define CONFIG_EXTRA_ENV_SETTINGS \
>>        "loadaddr=0x82000000\0" \
>>        "console=ttyO2,115200n8\0" \
>> +       "fdt_high=0xffffffff\0" \
> 
>  Tested this on mainline and worked fine on 4430SDP.
> 
>  Tested the same on u-boot-arm, but did not work there.
>  Not sure what i am missing.

Thanks. I have not tried uboot-arm branch. I am guess that DT booting
does not work on the uboot-arm branch with or without this patch. Correct?

BTW, I just resent the original patch to the ML as the first version did
not seem to make it.

Cheers
Jon

[U-Boot] [PATCH] OMAP4: Set fdt_high for OMAP4 devices to enable booting with Device Tree

[Tom Rini]

On Tue, May 01, 2012 at 03:05:08PM -0500, Jon Hunter wrote:
> From: Jon Hunter <jon-hunter@ti.com>
> 
> 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 <r.sricharan@ti.com>
> Cc: Sandeep Paulraj <s-paulraj@ti.com>
> Cc: Tom Rini <trini@ti.com>
> Signed-off-by: Jon Hunter <jon-hunter@ti.com>

Applied to u-boot-ti/master, thanks.

-- 
Tom