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LCD controller driver (da8xx) unable to allocate memory for framebuffer

Andrea Marson
Intellectual 800 points
Other Parts Discussed in Thread: DA8XX

We are porting linux 3.2.0 on custom hardware. We have a problem related to LCD controller driver. For some reason it is not able to allocate memory region for frame buffer:

[   13.867104] da8xx_lcdc da8xx_lcdc.0: GLCD: Found AM800480STMQW_TA1 panel
[   15.666684] [function=fb_probe, line=1393] Trying to allocate 3072000 bytes for frambuffer ...
[  203.968827] arm_vmregion_alloc: allocation too big (requested 0x2ee000)

Memory layout looks like this:

[    0.000000] Virtual kernel memory layout:
[    0.000000]     vector  : 0xffff0000 - 0xffff1000   (   4 kB)
[    0.000000]     fixmap  : 0xfff00000 - 0xfffe0000   ( 896 kB)
[    0.000000]     vmalloc : 0xd0800000 - 0xff000000   ( 744 MB)
[    0.000000]     lowmem  : 0xc0000000 - 0xd0000000   ( 256 MB)
[    0.000000]     modules : 0xbf000000 - 0xc0000000   (  16 MB)
[    0.000000]       .text : 0xc0008000 - 0xc059d000   (5716 kB)
[    0.000000]       .init : 0xc059d000 - 0xc05db000   ( 248 kB)
[    0.000000]       .data : 0xc05dc000 - 0xc0644198   ( 417 kB)
[    0.000000]        .bss : 0xc06441bc - 0xc0671024   ( 180 kB)

Any hint?

Regards.

allocation too big

  • 0
    Expert 1210 points

    You need to increase FORCE_MAX_ZONEORDER from 11 to 12.

    diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
    index f44d5a0..ed39cdb 100644
    --- a/arch/arm/Kconfig
    +++ b/arch/arm/Kconfig
    @@ -1698,10 +1698,10 @@ config HW_PERF_EVENTS
    source "mm/Kconfig"

    config FORCE_MAX_ZONEORDER
    - int "Maximum zone order" if ARCH_SHMOBILE
    - range 11 64 if ARCH_SHMOBILE
    + int "Maximum zone order"
    + range 12 64 if ARCH_SHMOBILE || SOC_AM33XX
    default "9" if SA1111
    - default "11"
    + default "12"
    help
    The kernel memory allocator divides physically contiguous memory
    blocks into "zones", where each zone is a power of two number of

  • 0 in reply to John Murphy1
    Intellectual 800 points 
    John,
    thanks a lot for you help. 
    In the meanwhile I found this thread
    http://e2e.ti.com/support/dsp/sitara_arm174_microprocessors/f/791/t/189862.aspx
    that talks about the same issue.
    After applying this change LCD and framebuffer work fine.

    Regards,
    llandre