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DeprecatedGTA04Kernel » History » Version 10

Paul Kocialkowski, 03/11/2013 11:56 AM

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h1. GTA04 Kernel
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This page documents the various tried to get a working kernel for the GTA04 with ICS userspace.
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Notes:
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* The GTA04 is an AM37x OMAP board like the BeagleBoard XM. The other BeagleBoard models use another OMAP3 SoC.
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* "AM37x category":http://processors.wiki.ti.com/index.php/Category:AM37x on TI wiki
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Resources:
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* Neil Brown's "gta04 kernel tree":http://git.neil.brown.name/git?p=gta04.git includes 3.2, 3.3, 3.4 and 3.5 kernels
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* AOSP's "common kernel tree":https://android.googlesource.com/kernel/common/ includes 3.0 3.3 and 3.4 kernels
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h2. Rowboat kernel
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The TI porting guide for AM37x devices advices to use the rowboat tree with the rowboat-ics.xml manifest.
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The kernel in that tree is branch "rowboat-ics-kernel-2.6.37":https://gitorious.org/rowboat/kernel/commits/rowboat-ics-kernel-2.6.37 from the rowboat kernel.
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Porting the GTA04 board and drivers to this kernel seems possible, however this is a very old kernel revision.
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The gta04 kernel based on rowboat kernel is at: http://git.paulk.fr/gitweb/?p=replicant/kernel-gta04.git;a=shortlog;h=refs/heads/rowboat-gta04
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Status matrix:
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| *Component* | *Status* |
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| Board file | OK (boots normally) |
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| RS232 | OK |
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| Modem | Missing |
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| Power off/reboot | Reboot works, poweroff leaves led on |
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| GPS | Missing |
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| WiFi/Bluetooth | Missing |
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| LCD | OK |
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| Graphics (fb) | OK, fast |
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| Touch screen | OK |
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| Backlight | Missing |
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| Sensors | Missing |
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| Audio | Missing |
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| Headset | Missing |
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| USB | OK, issue at suspend |
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| microSD | OK |
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| Buttons | Missing |
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| LEDs | Missing |
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| Battery | Missing |
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h2. Omapzoom kernel
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Omapzoom (where TI pushes code for Android) has an "omap3 kernel":http://omapzoom.org/?p=kernel/omap.git;a=commit;h=refs/heads/p-android-omap3-3.0 that should match ICS userspace.
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However, when running on the GTA04, serious power management issues caused characters to be dropped on serial after not touching the phone for a couple of seconds as well as IRQ interrupts being dropped, which caused the touchscreen to not work properly. Suspend/resume and earlysuspend works perfectly though. Maybe this kernel wasn't designed for AM37x OMAP3 devices but another kind of OMAP3 SoCs: there is no support for Android Beagleboard.
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h2. AOSP's 3.4 common kernel merged with Neil Brown's 3.4 gta04 kernel
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Merging AOSP's 3.4 common kernel on top of Neil Brown's 3.4 gta04 kernel and adding the Android options to the defconfig resulted in a non-working kernel where input events didn't seem to be reported correctly to userspace (even with an USB mouse, click events seemed dropped).
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h2. Kernels on Gitorious/Replicant:
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The "repository is here,":https://gitorious.org/replicant/kernel_goldelico_gta04 
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* the replicant-4.0+3.7+WIP branch contains the kernel 3.7 for the gta04(which comes from "neil brown's git":http://git.neil.brown.name/git?p=gta04.git;a=summary (git://neil.brown.name/gta04.git) probably at the 3.7-gta04 branch with adb forward-ported to it on top. The others android features comes from the mainline 3.7 kernel.
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* the replicant-4.0+3.7+WIP branch contains the experimental/android-3.8 branch of the "AOSP common kernel":https://android.googlesource.com/kernel/common/ with on top, the result of the rebase of the mainline branch of "neil brown's git":http://git.neil.brown.name/git?p=gta04.git;a=summary on top of 3.7 (which was also pushed in neil-rebase-3.7 branch for historic purposes), which is forward ported to 3.8
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h3. Issues
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Both branches seem to make trebuchet freeze, on the system log there is:
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<pre>
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I/WindowManager(  191): Input event dispatching timed out sending to Keyguard
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</pre>