[yocto] [PATCH] linux-yocto 3.0: fix beagleboard boot hang on mmc init due to preempt

[Bruce Ashfield]

On 12-04-16 8:18 PM, Denys Dmytriyenko wrote:
> From: Denys Dmytriyenko<denys at ti.com>
>
> The boot hangs with the message:
> mmc0: error -110 whilst initialising SD card
>
> The MMC driver has issues initializing when PREEMPT is enabled (either forced
> or voluntary). Unplugging and then plugging the card back will reset the
> driver and continue booting. Alternatively, disable preemption.

Looks good .. and as discussed perfectly reasonable for now. I'll
pull this into the repo tomorrow (this) morning and send it around for
merging.

Thanks for the fix,

Bruce

>
> Signed-off-by: Denys Dmytriyenko<denys at ti.com>
> ---
>   .../recipes-kernel/linux/files/no-preempt.cfg      |    1 +
>   .../recipes-kernel/linux/files/no-preempt.scc      |    1 +
>   .../recipes-kernel/linux/linux-yocto_3.0.bbappend  |    6 ++++++
>   3 files changed, 8 insertions(+), 0 deletions(-)
>   create mode 100644 meta-yocto/recipes-kernel/linux/files/no-preempt.cfg
>   create mode 100644 meta-yocto/recipes-kernel/linux/files/no-preempt.scc
>
> diff --git a/meta-yocto/recipes-kernel/linux/files/no-preempt.cfg b/meta-yocto/recipes-kernel/linux/files/no-preempt.cfg
> new file mode 100644
> index 0000000..0cbeb5a
> --- /dev/null
> +++ b/meta-yocto/recipes-kernel/linux/files/no-preempt.cfg
> @@ -0,0 +1 @@
> +CONFIG_PREEMPT_NONE=y
> diff --git a/meta-yocto/recipes-kernel/linux/files/no-preempt.scc b/meta-yocto/recipes-kernel/linux/files/no-preempt.scc
> new file mode 100644
> index 0000000..1e75e15
> --- /dev/null
> +++ b/meta-yocto/recipes-kernel/linux/files/no-preempt.scc
> @@ -0,0 +1 @@
> +kconf non-hardware no-preempt.cfg
> diff --git a/meta-yocto/recipes-kernel/linux/linux-yocto_3.0.bbappend b/meta-yocto/recipes-kernel/linux/linux-yocto_3.0.bbappend
> index 944f601..d5460fd 100644
> --- a/meta-yocto/recipes-kernel/linux/linux-yocto_3.0.bbappend
> +++ b/meta-yocto/recipes-kernel/linux/linux-yocto_3.0.bbappend
> @@ -1,3 +1,5 @@
> +FILESEXTRAPATHS_prepend := "${THISDIR}/files:"
> +
>   KMACHINE_atom-pc  = "yocto/standard/common-pc/atom-pc"
>   KMACHINE_routerstationpro = "yocto/standard/routerstationpro"
>   KMACHINE_mpc8315e-rdb = "yocto/standard/fsl-mpc8315e-rdb"
> @@ -13,3 +15,7 @@ COMPATIBLE_MACHINE_mpc8315e-rdb = "mpc8315e-rdb"
>   COMPATIBLE_MACHINE_routerstationpro = "routerstationpro"
>   COMPATIBLE_MACHINE_beagleboard = "beagleboard"
>   COMPATIBLE_MACHINE_atom-pc = "atom-pc"
> +
> +KERNEL_FEATURES_append_beagleboard = " no-preempt.scc"
> +
> +SRC_URI_append_beagleboard = " file://no-preempt.scc"