Messages in this thread | | | Subject | Re: [RFC PATCH arm: initial TI-Nspire support] | From | Daniel Tang <> | Date | Tue, 9 Apr 2013 15:59:52 +1000 |
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On 09/04/2013, at 5:16 AM, Fabian Vogt <fabian@ritter-vogt.de> wrote:
> The latest kernel it seems to get stuck at > console_lock() in register_framebuffer (drivers/video/fbmem.c:1655) > if the LCD-controller is enabled. (Early printk and serial console works fine) > CONFIG_NO_HZ is not activated, it works completely. > Could this be a kernel bug or is this an issue with our timer configuration?
Even with the CONFIG_NO_HZ option disabled, I've found that probing of our LCD hardware sometimes still fail with an error of -2.
Depending on how I arrange the device tree or the contents of the boot arguments or, as said, the CONFIG_NO_HZ option, I get different behaviours ranging from: * Getting a -2 error during device probe (possibly due to a clock not being found). * LCD hardware is found but boot hangs right after the driver is initialised. * LCD hardware is apparently initialised correctly and text appears onscreen but user mode init hangs and I never get to a shell prompt.
This smells of a race condition that occurs before the clcd driver even gets to initialise. Some bug in our timer code? A OF or console bug perhaps? Though, I'm a bit hesitant to blame it on a kernel subsystem bug until it's clear that our code isn't at fault.
Any suggestions?
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