[meta-xilinx] [PATCH] linux/config: For Zynq hard disable CONFIG_DEBUG_RODATA

[Nathan Rossi]

On 10 November 2016 at 21:58, Nathan Rossi <nathan at nathanrossi.com> wrote:
> CONFIG_DEBUG_RODATA was switched to default yes in v4.6+ kernels. Whilst
> the feature works correctly it causes changes with how the kernel
> .head.text and .text sections are padded which allows for memory below
> 0x80000 (512KB) to be non-reserved and used as memory for DMA
> allocations which do not work on Zynq due to devices not being allowed
> to access DDR below 0x80000. Disabling CONFIG_DEBUG_RODATA prevents the
> padding between .head.text/.text.

Merged.

Regards,
Nathan

>
> Signed-off-by: Nathan Rossi <nathan at nathanrossi.com>
> ---
>  recipes-kernel/linux/config/xilinx-common/bsp/xilinx/soc/zynq7.cfg | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/recipes-kernel/linux/config/xilinx-common/bsp/xilinx/soc/zynq7.cfg b/recipes-kernel/linux/config/xilinx-common/bsp/xilinx/soc/zynq7.cfg
> index 935848758c..b6dc0dbd6e 100644
> --- a/recipes-kernel/linux/config/xilinx-common/bsp/xilinx/soc/zynq7.cfg
> +++ b/recipes-kernel/linux/config/xilinx-common/bsp/xilinx/soc/zynq7.cfg
> @@ -40,3 +40,6 @@ CONFIG_CPU_FREQ_GOV_CONSERVATIVE=y
>  CONFIG_CPU_IDLE=y
>  CONFIG_ARM_ZYNQ_CPUIDLE=y
>
> +# DEBUG_RODATA causes issues with the lower 512KB of memory which doesn't do DMA
> +# CONFIG_DEBUG_RODATA is not set
> +
> --
> 2.10.2
>