SRU Justification: Impact: Current omap 3 kernel doesn't handle all the available uarts when running on a Beagleboard-xM, failining and to initialize uart4 and leading to a trace warning while booting the kernel.
Fix: The fix is already upstream and the proposed fix is just a backport of the needed changes. It basically defines the uart 4, set up it's ick/fck and change the code to correctly use it on a omap 3640. Testcase: When booting on a Beagleboard-xM the following warning trace appers: [ 0.000000] ------------[ cut here ]------------ [ 0.000000] WARNING: at /build/buildd/linux-2.6.35/arch/arm/mach-omap2/serial.c:727 omap_serial_init_port+0x88/0x1f8() [ 0.000000] (null): can't init uart3, no clocks available [ 0.000000] Modules linked in: [ 0.000000] [<c004c508>] (unwind_backtrace+0x0/0x100) from [<c051a2a8>] (dump_stack+0x18/0x1c) [ 0.000000] [<c00109b4>] (omap_serial_init+0x30/0x3c) from [<c00125e0>] (omap3_beagle_init+0x6c/0xfc) [ 0.000000] [<c00125e0>] (omap3_beagle_init+0x6c/0xfc) from [<c000c660>] (customize_machine+0x24/0x2c) [ 0.000000] [<c000c660>] (customize_machine+0x24/0x2c) from [<c00443bc>] (do_one_initcall+0x3c/0x1dc) [ 0.000000] [<c00443bc>] (do_one_initcall+0x3c/0x1dc) from [<c00085b4>] (do_basic_setup+0x64/0x74) [ 0.000000] [<c00085b4>] (do_basic_setup+0x64/0x74) from [<c0008654>] (kernel_init+0x90/0x120) [ 0.000000] [<c0008654>] (kernel_init+0x90/0x120) from [<c0045af4>] (kernel_thread_exit+0x0/0x8) [ 0.000000] ---[ end trace da227214a82491b7 ]--- After applying the fix this warninig is gone. Same patches can also be found at the Linaro's 2.6.35 kernel tree. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/688765 Title: Can't init uart3 (no clocks available) at Beagleboard-xM -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
