[PATCH 23/28] ARM: at91: sama5d27-som1: add additional first stage entry point

[Sascha Hauer]

On Wed, Jul 01, 2020 at 11:11:17AM +0200, Ahmad Fatoum wrote:
> The BootROM constrains us to a 64K big first stage bootloader. Add a PBL
> entry point for a xload barebox that sets up the minimum necessary to
> load a FAT32 barebox.bin from the SD-Card.
> 
> Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
> ---
>  arch/arm/boards/sama5d27-som1/lowlevel.c      | 32 +++++++++------
>  arch/arm/mach-at91/Kconfig                    |  1 +
>  arch/arm/mach-at91/include/mach/barebox-arm.h | 21 ++++++++++
>  .../include/mach/sama5d2-sip-ddramc.h         | 39 +++++++++++++++++++
>  images/Makefile.at91                          |  5 +++
>  5 files changed, 87 insertions(+), 11 deletions(-)
>  create mode 100644 arch/arm/mach-at91/include/mach/barebox-arm.h
>  create mode 100644 arch/arm/mach-at91/include/mach/sama5d2-sip-ddramc.h
> 
> diff --git a/arch/arm/boards/sama5d27-som1/lowlevel.c b/arch/arm/boards/sama5d27-som1/lowlevel.c
> index 2e408ce832f7..d52c4ca7465e 100644
> --- a/arch/arm/boards/sama5d27-som1/lowlevel.c
> +++ b/arch/arm/boards/sama5d27-som1/lowlevel.c
> @@ -5,13 +5,12 @@
>  
>  #include <common.h>
>  #include <init.h>
> -
> -#include <asm/barebox-arm-head.h>
> -#include <asm/barebox-arm.h>
> +#include <mach/barebox-arm.h>
>  #include <mach/sama5d2_ll.h>
>  #include <mach/iomux.h>
> +#include <mach/xload.h>
>  #include <debug_ll.h>
> -#include <mach/at91_dbgu.h>
> +#include <mach/sama5d2-sip-ddramc.h>
>  
>  #define RGB_LED_GREEN (1 << 0)
>  #define RGB_LED_RED   (1 << 1)
> @@ -40,23 +39,34 @@ static void ek_turn_led(unsigned color)
>  	}
>  }
>  
> -static void ek_dbgu_init(void)
> +SAMA5_ENTRY_FUNCTION(start_sama5d27_som1_ek_xload_mmc, r4)
>  {
> -	sama5d2_resetup_uart_console(MASTER_CLOCK);
> +	void __iomem *dbgu_base;
> +	sama5d2_lowlevel_init();
> +
> +	dbgu_base = sama5d2_resetup_uart_console(MASTER_CLOCK);
> +	if (IS_ENABLED(CONFIG_DEBUG_LL))
> +		putc_ll('>');

putc_ll() is a noop function when CONFIG_DEBUG_LL is disabled. No need
to put it inside a IS_ENABLED(CONFIG_DEBUG_LL).

Sascha

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