hi Thierry,
> -Original Messages-
> From: "Thierry Reding"
> Sent Time: 2015-03-20 19:47:49 (Friday)
> To: u-boot@lists.denx.de
> Cc: "Marc Zyngier"
> Subject: [U-Boot] [PATCH 2/6] armv8: Implement CONFIG_SYS_MALLOC_F_LEN support
>
> From: Thierry Reding
>
> Implement early malloc() support in a similar way as on 32-bit ARM. This
> is required for 64-bit Tegra SoCs that initialize from the device tree
> just like the earlier 32-bit SoCs.
>
> Cc: Albert Aribaud
> Cc: Marc Zyngier
> Signed-off-by: Thierry Reding
> ---
> arch/arm/include/asm/config.h | 4
> arch/arm/lib/crt0_64.S| 16 ++--
> 2 files changed, 14 insertions(+), 6 deletions(-)
>
> diff --git a/arch/arm/include/asm/config.h b/arch/arm/include/asm/config.h
> index be80434dee4d..7a34a0186cb1 100644
> --- a/arch/arm/include/asm/config.h
> +++ b/arch/arm/include/asm/config.h
> @@ -7,10 +7,6 @@
> #ifndef _ASM_CONFIG_H_
> #define _ASM_CONFIG_H_
>
> -#ifdef __aarch64__
> -#define CONFIG_SYS_GENERIC_GLOBAL_DATA
> -#endif
> -
> #define CONFIG_LMB
> #define CONFIG_SYS_BOOT_RAMDISK_HIGH
>
> diff --git a/arch/arm/lib/crt0_64.S b/arch/arm/lib/crt0_64.S
> index 77563967e517..010efdbf8f3f 100644
> --- a/arch/arm/lib/crt0_64.S
> +++ b/arch/arm/lib/crt0_64.S
> @@ -62,9 +62,21 @@ ENTRY(_main)
> * Set up initial C runtime environment and call board_init_f(0).
> */
> ldr x0, =(CONFIG_SYS_INIT_SP_ADDR)
> + mov x1, x0
> sub x0, x0, #GD_SIZE/* allocate one GD above SP */
> - bic sp, x0, #0xf/* 16-byte alignment for ABI compliance */
> - mov x18, sp /* GD is above SP */
> + bic x0, x0, #0xf/* 16-byte alignment for ABI compliance
> */
> + mov x18, x0 /* GD is above SP */
> + mov sp, x0
> +clr_gd:
> + str xzr, [x0], #8
> + cmp x0, x1
> + b.loclr_gd
> +#if defined(CONFIG_SYS_MALLOC_F_LEN)
> + ldr x0, =CONFIG_SYS_MALLOC_F_LEN
> + sub x0, sp, x0
> + str x0, [x18, #GD_MALLOC_BASE]
sp should substract CONFIG_SYS_MALLOC_F_LEN also.
Actually my previous patch did the same work, but got no reply.
> +#endif
> +3:
> mov x0, #0
> bl board_init_f
>
> --
> 2.3.2
>
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