Panda How to kernel 3 1 rel - Revision history

Prpplague: /* I2C Patch */

2011-12-08T23:45:45Z

‎I2C Patch

Prpplague: /* Introduction */

2011-12-08T23:43:34Z

‎Introduction

KenMcGuire at 16:36, 31 October 2011

2011-10-31T16:36:21Z

KenMcGuire at 16:16, 31 October 2011

2011-10-31T16:16:40Z

KenMcGuire: Created page with "== Introduction == Continuing Happy 20th Birthday Greetings to Linux!! The merge window for 3.1 is over and the 3.1-rc1 kernel has been released. Lots of work on the omap platfor..."

2011-10-31T16:04:54Z

Created page with "== Introduction == Continuing Happy 20th Birthday Greetings to Linux!! The merge window for 3.1 is over and the 3.1-rc1 kernel has been released. Lots of work on the omap platfor..."

New page

== Introduction ==
Continuing Happy 20th Birthday Greetings to Linux!!
The merge window for 3.1 is over and the 3.1-rc1 kernel has been released.
Lots of work on the omap platforms and on pandaboard. Let's see
what -rc1 has brought.

== rc1 ==

There is still an issue with the setting up of the wl12xx:

[ 0.181457] error setting wl12xx data

The extremely simple workaround available for 3.0, moved to twl_common.c in -rc1, doesn't produce the working wlan as in 3.0.
But applying that to the -rc2 code does result in a functional wl12xx driver.

More to come as these issue are investigated.

== rc2 ==
Yep, -rc2 is out and I haven't had the time to fiddle much with it as yet, on to -rc3.
In short, -rc2 fixes some of the wl12xx issues, but still requires a patch to function.
There is still an unresolved start up issue with wl12xx, in that sometimes it will work, sometimes, not. Same kernel, MLO, & u-boot and userspace.

== rc3 ==
-rc3 is out and there are no OMAP or Panda changes. However there is a boot issue with Panda
as described here: https://lkml.org/lkml/2011/8/25/117

This issue has been resolved, so be sure to get this commit or later from git:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commit;h=69dd3d8e29e294caaf63eb5e8a72d250279f9e5f

== rc4 ==
-rc4 has been released and yet again there are no OMAP or Panda changes. The issue introduced in -rc3 noted above, has been resolved.

If you build the wl12xx driver as a module, and modprobe it, the wlan seems to start up fine every time, must be some sort of race when it is compiled into the kernel.

== rc5 ==
-rc5 has been released, and kernel.org is still sort of sick. Not to worry, Linus has a github repository that you can pull from (if you dare ;>),
see https://lkml.org/lkml/2011/9/4/92 for details. From the changelog, it doesn't look like any omap4 or PandaBoard related changes, so we'll wait a bit to see if kernel.org recovers after the holiday.

== rc6 ==
-rc6 has been released, and kernel.org is still down. I cloned Linus's github repo so as not to disturb my kernel.org repo (yes I know I could have pulled from the github repo, and with a few other magic git incantations resulted in the same thing...maybe...). There have been some OMAP4 related changes, but applying the same patches as -rc4, a working kernel as described below is the result.

== rc7 ==
-rc7 has been released and Linus says that 3.1 won't happen till kernel.org is back, so we may have a few more -rcx's ahead of us.
No OMAP or Panda related changes in -rc7, the same patches that worked for -rc4 still work (some with a bit of an offset).

== git.kerenl.org ==
It's back, mostly, as of 10/3/2011. Stay tuned.

== rc8 ==
Skipped

== rc9 ==
With git.kerne.org back, Linus has resumed the 3.1-rcx series on http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git

3.1 should be released soon, -rc9 is out which should be pretty close. The same patches that worked for -rc4 still work (some with a bit of an offset).

== USB Performance improvement ==
This patch fixs one performance bug on ARM Cortex A9 dual core
platform, which has been reported on quite a few ARM machines
(OMAP4, Tegra 2, snowball...), see details from link of
https://bugs.launchpad.net/bugs/709245.

[[Media:0006-omap4-usb-improvement.patch|0006-omap4-usb-improvement.patch]]

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

patch -p1 < 0006-omap4-usb-improvement.patch

== wlan12xx patch ==
This patch is necessary to resolve the issue noted in 3.0 and 3.1-rc1 above, however the code has moved to twl_common.c and so an new patch is presented here.

[[Media:0001a-omap4-pandaboard-wlan-fix.patch|0001a-omap4-pandaboard-wlan-fix.patch]]

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

patch -p1 < 0001a-omap4-pandaboard-wlan-fix.patch

== DVI Patch ==
This patch is necessary to make 720p resolution available.

[[Media:0003-omap4-pandaboard-dvi720p.patch|0003-omap4-pandaboard-dvi720p.patch]]

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

patch -p1 < 0001-omap4-pandaboard-dvi720p.patch

Then use either of the following configs

make ARCH=arm omap2plus_defconfig
or
make ARCH=arm panda_dvi_defconfig

Compile as above.

== 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 3.1-rc1 or -rc2 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 3.1-rc1/rc2 sources. The omap2plus_defconfig works and illustrates the wl12xx issue, with or without a patch to twl_common.c. [[Media:config.3.1-rc1.1|config.3.1-rc1.1]] works with the dvi patch and i2c patch.

Building 3.1-rc4 -rc6/7 or -rc9 is a bit different if you want to have a working wlan.

In order to ensure that the wlan starts up consistently, it is recommended that the wl12xx driver be built as a module and started after the PandaBoard has booted.

Grab the 3.1-rc4 or -rc6/7/9 sources and use [[Media:config.3.1-rc4.1|config.3.1-rc4.1]], [[Media:config.3.1-rc6.1|config.3.1-rc6.1]], [[Media:config.3.1-rc7.1|config.3.1-rc7.1]] or [[Media:config.3.1-rc9.1|config.3.1-rc9.1]]as the .config (this requires you patch the dvi & i2c as above)

Then compile like so:

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

Then compile the modules like so:

make ARCH=arm CROSS_COMPILE=/home/kenm/Panda/arm-2010q1/bin/arm-none-linux-gnueabi- modules

"Install" the modules to somewhere convenient:

make ARCH=arm CROSS_COMPILE=/home/kenm/Panda/arm-2010q1/bin/arm-none-linux-gnueabi- INSTALL_MOD_PATH=../testlib_omap modules_install

Copy lib/modules/3.1.0-rc4-dirty/, lib/modules/3.1.0-rc6-dirty/, lib/modules/3.1.0-rc7-dirty/ or lib/modules/3.1.0-rc9-dirty/ to your SD card (as root), boot up the Pandaboard.

== 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 ===
Make sure that a monitor is plugged into the HDMI port before doing the following:

# 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.

Make sure that a monitor is plugged into the DVI port before doing the following:

# 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: -- -- -- -- -- -- -- --

=== wlan ===

Run the following commands after the PandaBoard is booted:

modprobe wl12xx_sdio
ifconfig wlan0 up
iwconfig wlan0 essid "Your AccessPoint Name"
udhcpc -i wlan0

If your network is set up to provide DHCP services, the PandaBoard will get all the "right stuff(tm)" and you will be able to access the Internet.

# ping www.google.com
PING www.google.com (74.125.73.99): 56 data bytes
64 bytes from 74.125.73.99: seq=0 ttl=43 time=62.683 ms
64 bytes from 74.125.73.99: seq=1 ttl=43 time=54.077 ms
64 bytes from 74.125.73.99: seq=2 ttl=43 time=51.484 ms
64 bytes from 74.125.73.99: seq=3 ttl=43 time=54.108 ms

=== USB Performance ===

Insert a USB memory stick into one of the usb ports

Run dmesg to see what sdx the stick was recognised as, then:

hdparam -tT /dev/sdx

If you did this on a kernel without the patch you will see some improvement, if you run the same command on a desktop Linux system, with the same USB memory stick, the PandaBoard's speed should roughly be the same.

[[Category:PandaBoard]]

@@ Line 2: / Line 2: @@
 Kernel 3.1 has been released, and welcome back git.kernel.org,
 kernel.org still is not fully functional though.
 == Highlites of the -rc series ==

@@ Line 89: / Line 89: @@
   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.
+  See http://git.kernel.org/?p=linux/kernel/git/tmlind/linux-omap.git;a=commit;h=39fe1a6fafe1e85c183379af9f3ceda7cd24bd65 for the commit.
   * A quick fix for this issue is available [[file:omap44xx-i2c-fix.patch|Available]]

@@ Line 86: / Line 86: @@
 Compile as above.
-== Building ==
+== Building Kernel 3.1 ==
-Building 3.1-rc1 or -rc2 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 3.1-rc1/rc2 sources. The omap2plus_defconfig works and illustrates the wl12xx issue, with or without a patch to twl_common.c.  [[Media:config.3.1-rc1.1|config.3.1-rc1.1]] works with the dvi patch and i2c patch.
+Building 3.1 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 3.1 sources. The omap2plus_defconfig works.
-Building 3.1-rc4 -rc6/7 or -rc9 is a bit different if you want to have a working wlan.
+Building is a bit different if you want to have a working wlan.
 In order to ensure that the wlan starts up consistently, it is recommended that the wl12xx driver be built as a module and started after the PandaBoard has booted.
-Grab the 3.1-rc4 or -rc6/7/9 sources and use [[Media:config.3.1-rc4.1|config.3.1-rc4.1]], [[Media:config.3.1-rc6.1|config.3.1-rc6.1]], [[Media:config.3.1-rc7.1|config.3.1-rc7.1]] or [[Media:config.3.1-rc9.1|config.3.1-rc9.1]]as the .config (this requires you patch the dvi & i2c as above)
+Use [[Media:config.3.1.1|config.3.1.1]] as the .config (this requires you patch the dvi, wlan & i2c as above)
 Then compile like so:
@@ Line 107: / Line 107: @@
   make ARCH=arm CROSS_COMPILE=/home/kenm/Panda/arm-2010q1/bin/arm-none-linux-gnueabi- INSTALL_MOD_PATH=../testlib_omap modules_install
-Copy lib/modules/3.1.0-rc4-dirty/, lib/modules/3.1.0-rc6-dirty/, lib/modules/3.1.0-rc7-dirty/ or lib/modules/3.1.0-rc9-dirty/ to your SD card (as root), boot up the Pandaboard.
+Copy lib/modules/3.1-dirty/ to your SD card (as root), boot up the Pandaboard.

@@ Line 1: / Line 1: @@
 == Introduction ==
-Continuing Happy 20th Birthday Greetings to Linux!!
+Kernel 3.1 has been released, and welcome back git.kernel.org,
-The merge window for 3.1 is over and the 3.1-rc1 kernel has been released.
+kernel.org still is not fully functional though.
-Lots of work on the omap platforms and on pandaboard. Let's see
-what -rc1 has brought.
-== rc1 ==
+== Highlites of the -rc series ==
-There is still an issue with the setting up of the wl12xx:
+Still had issues with the setting up of the wl12xx:
- [    0.181457] error setting wl12xx data
+=== rc2 ===
 -rc2 fixes some of the wl12xx issues, but still requires a patch to function.
-The extremely simple workaround available for 3.0, moved to twl_common.c in -rc1, doesn't produce the working wlan as in 3.0.
-But applying that to the -rc2 code does result in a functional wl12xx driver.
-−
-More to come as these issue are investigated.
-−
 == rc2 ==
-Yep, -rc2 is out and I haven't had the time to fiddle much with it as yet, on to -rc3.
-In short, -rc2 fixes some of the wl12xx issues, but still requires a patch to function.
 There is still an unresolved start up issue with wl12xx, in that sometimes it will work, sometimes, not. Same kernel, MLO, & u-boot and userspace.
-== rc3 ==
+=== rc3 ===
--rc3 is out and there are no OMAP or Panda changes. However there is a boot issue with Panda
+-rc3 had no OMAP or Panda changes. However there was a boot issue with Panda
 as described here: https://lkml.org/lkml/2011/8/25/117
-This issue has been resolved, so be sure to get this commit or later from git:
+=== rc4 ===
-http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commit;h=69dd3d8e29e294caaf63eb5e8a72d250279f9e5f
+-rc4 had no OMAP or Panda changes. The issue introduced in -rc3 noted above, was resolved.
-−
-== rc4 ==
--rc4 has been released and yet again there are no OMAP or Panda changes. The issue introduced in -rc3 noted above, has been resolved.
-−
-If you build the wl12xx driver as a module, and modprobe it, the wlan seems to start up fine every time, must be some sort of race when it is compiled into the kernel.
-−
-== rc5 ==
--rc5 has been released, and kernel.org is still sort of sick. Not to worry, Linus has a github repository that you can pull from (if you dare ;>),
-see https://lkml.org/lkml/2011/9/4/92 for details. From the changelog, it doesn't look like any omap4 or PandaBoard related changes, so we'll wait a bit to see if kernel.org recovers after the holiday.
-−
-== rc6 ==
--rc6 has been released, and kernel.org is still down. I cloned Linus's github repo so as not to disturb my kernel.org repo (yes I know I could have pulled from the github repo, and with a few other magic git incantations resulted in the same thing...maybe...). There have been some OMAP4 related changes, but applying the same patches as -rc4, a working kernel as described below is the result.
-−
-== rc7 ==
--rc7 has been released and Linus says that 3.1 won't happen till kernel.org is back, so we may have a few more -rcx's ahead of us.
-No OMAP or Panda related changes in -rc7, the same patches that worked for -rc4 still work (some with a bit of an offset).
-== git.kerenl.org ==
+Figured out you need to build the wl12xx driver as a module, and modprobe it, the wlan seems to start up fine every time, must be some sort of race when it is compiled into the kernel.
-It's back, mostly, as of 10/3/2011. Stay tuned.
-== rc8 ==
+=== rc7 ===
-Skipped
+-rc7 had no OMAP or Panda related changes, the same patches that worked for -rc4 still work (some with a bit of an offset).
-== rc9 ==
+=== git.kerenl.org ===
-With git.kerne.org back, Linus has resumed the 3.1-rcx series on http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git
+Came back, mostly, as of 10/3/2011.
-.1 should be released soon, -rc9 is out which should be pretty close. The same patches that worked for -rc4 still work (some with a bit of an offset).
+=== rc9 ===