Panda How to kernel 3 0 rel - Revision history

KenMcGuire at 20:44, 29 July 2011

2011-07-29T20:44:37Z

KenMcGuire at 20:37, 29 July 2011

2011-07-29T20:37:45Z

KenMcGuire: Created page with "== Introduction == Happy 20th Birthday Linux!! The 3.0 kernel has been released. Most of the regressions seen in 3.0-rcx have been addressed. There is still an issue with the se..."

2011-07-22T14:28:57Z

Created page with "== Introduction == Happy 20th Birthday Linux!! The 3.0 kernel has been released. Most of the regressions seen in 3.0-rcx have been addressed. There is still an issue with the se..."

New page

== Introduction ==
Happy 20th Birthday Linux!!
The 3.0 kernel has been released.

Most of the regressions seen in 3.0-rcx have been addressed.
There is still an issue with the setting up of the wl12xx:

[ 0.181457] error setting wl12xx data

There is no workaround as yet.

== DVI Patch ==
This patch is no longer strictly necessary, but without it the dvi output is 640x480. Applying it doesn't seem to hurt though.

Apply it like so: (from inside the kernel sources directory)

patch -p1 < 0001-omap4-pandaboard-fix-dvi-support.patch

Then use either of the following configs

make ARCH=arm omap2plus_defconfig
or
make ARCH=arm panda_dvi_defconfig

Then compile with

make ARCH=arm CROSS_COMPILE=Path_to_your/arm-2009q3/bin/arm-none-linux-gnueabi- uImage
or
make ARCH=arm CROSS_COMPILE=Path_to_your/arm-2010q1/bin/arm-none-linux-gnueabi- uImage

== I2C Patch ==
i2c character device driver

Ever since 2.6.38, the i2c character device driver support from user space has been broken for OMAP44xx.
* A fix has been submitted for the linux-omap-2.6 branch, but it may be a while till it gets into an -rcx.
See http://git.kernel.org/?p=linux/kernel/git/tmlind/linux-omap-2.6.git;a=commit;h=39fe1a6fafe1e85c183379af9f3ceda7cd24bd65 for the commit.
* A quick fix for this issue is available [[file:omap44xx-i2c-fix.patch|Available]]

Apply it like so: (from inside the kernel sources directory)

patch -p1 < Omap44xx-i2c-fix.patch

Compile as above.

== Building ==
Building 3.0 is basically the same as [[Panda_How_to_kernel_2_6_38|How to build 2.6.38 kernel]], but of course you need the 3.0 sources. The omap2plus_defconfig works and illustrates the wl12xx issue [[Media:config.3.0.1|config.3.0.1]] works with the dvi patch and i2c patch.

== Testing: ==

=== fbtest on DVI Port ===

After booting run fbtest to see a nice test pattern from the dvi port.

[[File:fbtest.jpg|240px]]

=== Switching primary display to the HDMI port ===

# Enable HDMI
echo "1" > /sys/devices/platform/omapdss/display1/enabled

# Disable overlay0 (an overlay must be disabled before changing its properties)
echo "0" > /sys/devices/platform/omapdss/overlay0/enabled

# Set the manager of overlay0 to display1 which is HDMI
echo "tv" > /sys/devices/platform/omapdss/overlay0/manager

# Enable overlay0
echo "1" > /sys/devices/platform/omapdss/overlay0/enabled

And content on overlay 0 of primary lcd would be transferred to HDMI. It works similarly for all other overlay's.

=== Switching primary display to the DVI port ===

See: http://omappedia.org/wiki/Bootargs_for_enabling_display for lots of useful info on the display subsystem. Be aware that the display, manager and overlay numbers don't match the panda configuration.

# Disable HDMI
echo "0" > /sys/devices/platform/omapdss/display1/enabled

# Disable overlay0 (an overlay must be disabled before changing its properties)
echo "0" > /sys/devices/platform/omapdss/overlay0/enabled

# Set the manager of overlay0 to display0 which is DVI
echo "lcd2" > /sys/devices/platform/omapdss/overlay0/manager

# Enable overlay0
echo "1" > /sys/devices/platform/omapdss/overlay0/enabled

The above commands should be run from the serial console and the cable should be in the destination port before running the commands.

=== fbtest on HDMI Port ===

Run fbtest to see a nice test pattern from the HDMI port.

[[File:fbtest2.jpg|240px]]

=== i2cdetect ===

You can run i2cdetect and the results should look like this:

# i2cdetect -y -r 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- UU UU UU UU -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --

[[Category:PandaBoard]]

@@ Line 11: / Line 11: @@
 [[Media:0001-omap4-pandaboard-wlan-fix.patch|0001-omap4-pandaboard-wlan-fix.patch]]
 == DVI Patch ==
@@ Line 27: / Line 37: @@
   make ARCH=arm panda_dvi_defconfig
-Then compile with
+Compile as above.
-−
- make ARCH=arm CROSS_COMPILE=Path_to_your/arm-2009q3/bin/arm-none-linux-gnueabi- uImage
-      or
- make ARCH=arm CROSS_COMPILE=Path_to_your/arm-2010q1/bin/arm-none-linux-gnueabi- uImage
-−
 == I2C Patch ==
@@ Line 49: / Line 54: @@
 == Building ==
-Building 3.0 is basically the same as [[Panda_How_to_kernel_2_6_38|How to build 2.6.38 kernel]], but of course you need the 3.0 sources. The omap2plus_defconfig works and illustrates the wl12xx issue [[Media:config.3.0.1|config.3.0.1]] works with the dvi patch and i2c patch.
+Building 3.0 is basically the same as [[Panda_How_to_kernel_2_6_38|How to build 2.6.38 kernel]], but of course you need the 3.0 sources. The omap2plus_defconfig works and illustrates the wl12xx issue [[Media:config.3.0.1|config.3.0.1]] works with the wlan patch, dvi patch and i2c patch.
 == Testing: ==

@@ Line 8: / Line 8: @@
   [    0.181457] error setting wl12xx data
-There is no workaround as yet.
+An extremely simple workaround is available
 == DVI Patch ==
-This patch is no longer strictly necessary, but without it the dvi output is 640x480. Applying it doesn't seem to hurt though.
+This patch is necessary to make 720p resolution available.
 Apply it like so: (from inside the kernel sources directory)
-  patch -p1 < 0001-omap4-pandaboard-fix-dvi-support.patch
+  patch -p1 < 0001-omap4-pandaboard-dvi720p.patch
 Then use either of the following configs