* Heiko Schocher <hs@xxxxxxx> [151012 22:58]:
> Of this, secure content (including PPA) uses initial
> portion of the SRAM. This chunk is not (and shouldn't
> be) accessible from the public code.
>
> The minimum size of this chunk (0x350) is used in this
> patch. Available size is rounded off to 63K.
>
> Both values would require a change if size of secure
> content grows beyond 0x350.
Makes sense to me. And something similar is needed at least for
dm814x to get rid of the imprecise abort during boot with
commit bbeb92095159 ("ARM: 8422/1: enable imprecise aborts during
early kernel startup") applied.
Is this needed as a fix to the -rc cycle, or can this wait for
v4.4?
Regards,
Tony
> Signed-off-by: Heiko Schocher <hs@xxxxxxx>
> Signed-off-by: Ayoub Zaki <Ayoub.Zaki@xxxxxxxxxxxx>
> ---
>
> arch/arm/mach-omap2/sram.c | 25 +++++++++++++++++++++++++
> 1 file changed, 25 insertions(+)
>
> diff --git a/arch/arm/mach-omap2/sram.c b/arch/arm/mach-omap2/sram.c
> index cd488b8..2e7c00f 100644
> --- a/arch/arm/mach-omap2/sram.c
> +++ b/arch/arm/mach-omap2/sram.c
> @@ -47,6 +47,28 @@
>
> #define GP_DEVICE 0x300
>
> +/**
> + * Size of chunk used by secure content in the HS/EMU devices.
> + *
> + * This size is not fixed. It depends upon the implementation of PPA.
> + * May need to be modified if the size grows.
> + */
> +#define AM33XX_HS_HEADER_SIZE 0x0350
> +
> +/**
> + * Start of public SRAM on HS/EMU devices.
> + */
> +#define AM33XX_SRAM_PA 0x40300000
> +#define AM33XX_SRAM_PUB_PA (AM33XX_SRAM_PA + AM33XX_HS_HEADER_SIZE)
> +
> +/**
> + * Size of public SRAM available on HS/EMU devices.
> + *
> + * This size also depends upon AM33XX_HS_HEADER_SIZE.
> + * Current value is derived from nearest round-off.
> + */
> +#define AM33XX_SRAM_PUB_SIZE 0xfc00 /* 63K */
> +
> #define ROUND_DOWN(value,boundary) ((value) & (~((boundary)-1)))
>
> static unsigned long omap_sram_start;
> @@ -99,6 +121,9 @@ static void __init omap_detect_sram(void)
> } else {
> omap_sram_size = 0x8000; /* 32K */
> }
> + } else if (soc_is_am33xx()) {
> + omap_sram_start = AM33XX_SRAM_PUB_PA;
> + omap_sram_size = AM33XX_SRAM_PUB_SIZE;
> } else {
> omap_sram_start = OMAP2_SRAM_PUB_PA;
> omap_sram_size = 0x800; /* 2K */
> --
> 2.1.0
>
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