[U-Boot] [PATCH v3 1/1] mpc85xx: Enable pre-relocation malloc for MPC85xx

[York Sun]

On 04/05/2016 06:06 AM, Mario Six wrote:
> To enable DM on MPC85xx, we need pre-relocation malloc, which is
> implemented in this patch.
> 
> We also make sure that the IVORs are always 4-aligned on e500 to prevent
> alignment exceptions caused by code changes in start.S.
> 
> Signed-off-by: Mario Six <mario.six at gdsys.cc>
> Cc: York Sun <york.sun at nxp.com>
> Cc: Simon Glass <sjg at chromium.org>
> ---
> 
> v3:
>  - Add comment regarding gd zeroing
>  - Unconditionally zero out initial RAM during startup
> 
> v2:
>  - Correct IVOR alignment and remove nop hack
>  - Add sanity check for length of malloc area
> 
> 
>  arch/powerpc/cpu/mpc85xx/cpu_init_early.c |  8 +-------
>  arch/powerpc/cpu/mpc85xx/start.S          | 30 ++++++++++++++++++++++++++++++
>  include/ppc_asm.tmpl                      |  3 +++
>  3 files changed, 34 insertions(+), 7 deletions(-)
> 
> diff --git a/arch/powerpc/cpu/mpc85xx/cpu_init_early.c b/arch/powerpc/cpu/mpc85xx/cpu_init_early.c
> index 235a635..85b4112 100644
> --- a/arch/powerpc/cpu/mpc85xx/cpu_init_early.c
> +++ b/arch/powerpc/cpu/mpc85xx/cpu_init_early.c
> @@ -82,7 +82,6 @@ void setup_ifc(void)
>  void cpu_init_early_f(void *fdt)
>  {
>  	u32 mas0, mas1, mas2, mas3, mas7;
> -	int i;
>  #ifdef CONFIG_SYS_FSL_ERRATUM_P1010_A003549
>  	ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
>  #endif
> @@ -95,12 +94,7 @@ void cpu_init_early_f(void *fdt)
>  	/* Pointer is writable since we allocated a register for it */
>  	gd = (gd_t *) (CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_GBL_DATA_OFFSET);
> 
> -	/*
> -	 * Clear initial global data
> -	 *   we don't use memset so we can share this code with NAND_SPL
> -	 */
> -	for (i = 0; i < sizeof(gd_t); i++)
> -		((char *)gd)[i] = 0;
> +	/* gd area was zeroed during startup */
> 
>  #ifdef CONFIG_QEMU_E500
>  	/*
> diff --git a/arch/powerpc/cpu/mpc85xx/start.S b/arch/powerpc/cpu/mpc85xx/start.S
> index d867e2a..82a151a 100644
> --- a/arch/powerpc/cpu/mpc85xx/start.S
> +++ b/arch/powerpc/cpu/mpc85xx/start.S
> @@ -1152,6 +1152,36 @@ _start_cont:
>  	/* Setup the stack in initial RAM,could be L2-as-SRAM or L1 dcache*/
>  	lis	r3,(CONFIG_SYS_INIT_RAM_ADDR)@h
>  	ori	r3,r3,((CONFIG_SYS_INIT_SP_OFFSET-16)&~0xf)@l /* Align to 16 */
> +
> +#ifdef CONFIG_SYS_MALLOC_F_LEN
> +
> +#if CONFIG_SYS_MALLOC_F_LEN + GENERATED_GBL_DATA_SIZE > CONFIG_SYS_INIT_RAM_SIZE
> +#error "CONFIG_SYS_MALLOC_F_LEN too large to fit into initial RAM."
> +#endif
> +
> +	/* Leave 16+ byte for back chain termination and NULL return address */
> +	subi	r3,r3,((CONFIG_SYS_MALLOC_F_LEN+16+15)&~0xf)
> +#endif
> +
> +	/* End of RAM */
> +	lis	r4,(CONFIG_SYS_INIT_RAM_ADDR)@h
> +	ori	r4,r4,(CONFIG_SYS_INIT_RAM_SIZE)@l
> +

CONFIG_SYS_INIT_RAM_SIZE is not defined for some platforms, for example
P1010RDB, C29XPCIE, BSC9132QDS. I will send out a patch to fix.

York