[PATCH v2 0/3] Add SPI boot to SPL on SUNIV/F1C100s

[PATCH v2 0/3] Add SPI boot to SPL on SUNIV/F1C100s

[Jesse Taube]

This patch adds the ability to detect the BROM's boot source,
as well as the ability to boot from SPI.

Jesse Taube (3):
  mach-sunxi: Add boot device detection for SUNIV/F1C100s
  mach-sunxi: Add SPL SPI boot for SUNIV
  mach-sunxi: Enable SPI boot for SUNIV and licheepi nano

 arch/arm/include/asm/arch-sunxi/gpio.h |  1 +
 arch/arm/include/asm/arch-sunxi/spl.h  | 10 +++++
 arch/arm/mach-sunxi/Kconfig            |  2 +-
 arch/arm/mach-sunxi/board.c            | 57 +++++++++++++-------------
 arch/arm/mach-sunxi/spl_spi_sunxi.c    | 24 +++++++----
 configs/licheepi_nano_defconfig        |  1 +
 6 files changed, 58 insertions(+), 37 deletions(-)

-- 
2.34.1

[PATCH v2 1/3] mach-sunxi: Add boot device detection for SUNIV/F1C100s

[Jesse Taube]

In contrast to other Allwinner SoCs the F1C100s BROM does not store a
boot source indicator in the eGON header in SRAM. This leaves the SPL
guessing where we were exactly booted from, and for instance trying
the SD card first, even though we booted from SPI flash.

By inspecting the BROM code and by experimentation, Samuel found that the
top of the BROM stack contains unique pointers for each of the boot
sources, which we can use as a boot source indicator.

This patch removes the existing board_boot_order bodge and replace it
with a proper boot source indication function.

Signed-off-by: Jesse Taube <Mr.Bossman075@gmail.com>
Suggested-by: Samuel Holland <samuel@sholland.org>
---
V1 -> V2:
* Bail on NAND
* Change commit description
* Change sunxi_get_boot_source to u32
* Fix FEL boot by next change
* Move suniv_get_boot_device call into sunxi_get_boot_source
* Rename suniv_get_boot_device
* Remove redundant comments
---
 arch/arm/include/asm/arch-sunxi/spl.h | 10 +++++
 arch/arm/mach-sunxi/board.c           | 57 +++++++++++++--------------
 2 files changed, 38 insertions(+), 29 deletions(-)

diff --git a/arch/arm/include/asm/arch-sunxi/spl.h b/arch/arm/include/asm/arch-sunxi/spl.h
index 58cdf806d9..9a6e8da8e1 100644
--- a/arch/arm/include/asm/arch-sunxi/spl.h
+++ b/arch/arm/include/asm/arch-sunxi/spl.h
@@ -19,6 +19,16 @@
 #define SUNXI_BOOTED_FROM_MMC0_HIGH	0x10
 #define SUNXI_BOOTED_FROM_MMC2_HIGH	0x12
 
+/*
+ * Values taken from the Bootrom's stack used
+ * to determine where we booted from.
+ */
+
+#define SUNIV_BOOTED_FROM_MMC0	0xffff40f8
+#define SUNIV_BOOTED_FROM_NAND	0xffff4114
+#define SUNIV_BOOTED_FROM_SPI	0xffff4130
+#define SUNIV_BOOTED_FROM_MMC1	0xffff4150
+
 #define is_boot0_magic(addr)	(memcmp((void *)(addr), BOOT0_MAGIC, 8) == 0)
 
 uint32_t sunxi_get_boot_device(void);
diff --git a/arch/arm/mach-sunxi/board.c b/arch/arm/mach-sunxi/board.c
index 57078f7a7b..27aee1e445 100644
--- a/arch/arm/mach-sunxi/board.c
+++ b/arch/arm/mach-sunxi/board.c
@@ -191,12 +191,37 @@ SPL_LOAD_IMAGE_METHOD("FEL", 0, BOOT_DEVICE_BOARD, spl_board_load_image);
 
 #define SUNXI_INVALID_BOOT_SOURCE	-1
 
-static int sunxi_get_boot_source(void)
+static uint32_t suniv_get_boot_source(void)
+{
+	/* Get the last function call from BootRom's stack. */
+	u32 brom_call = *(u32 *)(fel_stash.sp - 4);
+
+	/* translate SUNIV Bootrom stack to standard SUNXI boot sources */
+	switch (brom_call) {
+	case SUNIV_BOOTED_FROM_MMC0:
+		return SUNXI_BOOTED_FROM_MMC0;
+	case SUNIV_BOOTED_FROM_SPI:
+		return SUNXI_BOOTED_FROM_SPI;
+	case SUNIV_BOOTED_FROM_MMC1:
+		return SUNXI_BOOTED_FROM_MMC2;
+	/* SPI nand is invalid try to boot from FEL*/
+	case SUNIV_BOOTED_FROM_NAND:
+		return SUNXI_INVALID_BOOT_SOURCE;
+	}
+	/* If we get here something went wrong try to boot from FEL.*/
+	printf("Unknown boot source from BROM: 0x%x\n", brom_call);
+	return SUNXI_INVALID_BOOT_SOURCE;
+}
+
+static uint32_t sunxi_get_boot_source(void)
 {
 	if (!is_boot0_magic(SPL_ADDR + 4)) /* eGON.BT0 */
 		return SUNXI_INVALID_BOOT_SOURCE;
 
-	return readb(SPL_ADDR + 0x28);
+	if (IS_ENABLED(CONFIG_MACH_SUNIV))
+		return suniv_get_boot_source();
+	else
+		return readb(SPL_ADDR + 0x28);
 }
 
 /* The sunxi internal brom will try to loader external bootloader
@@ -204,7 +229,7 @@ static int sunxi_get_boot_source(void)
  */
 uint32_t sunxi_get_boot_device(void)
 {
-	int boot_source = sunxi_get_boot_source();
+	uint32_t boot_source = sunxi_get_boot_source();
 
 	/*
 	 * When booting from the SD card or NAND memory, the "eGON.BT0"
@@ -276,36 +301,10 @@ unsigned long spl_mmc_get_uboot_raw_sector(struct mmc *mmc,
 	return sector;
 }
 
-#ifdef CONFIG_MACH_SUNIV
-/*
- * The suniv BROM does not pass the boot media type to SPL, so we try with the
- * boot sequence in BROM: mmc0->spinor->fail.
- * TODO: This has the slight chance of being wrong (invalid SPL signature,
- * but valid U-Boot legacy image on the SD card), but this should be rare.
- * It looks like we can deduce from some BROM state upon entering the SPL
- * (registers, SP, or stack itself) where the BROM was coming from and use
- * that here.
- */
-void board_boot_order(u32 *spl_boot_list)
-{
-	/*
-	 * See the comments above in sunxi_get_boot_device() for information
-	 * about FEL boot.
-	 */
-	if (!is_boot0_magic(SPL_ADDR + 4)) {
-		spl_boot_list[0] = BOOT_DEVICE_BOARD;
-		return;
-	}
-
-	spl_boot_list[0] = BOOT_DEVICE_MMC1;
-	spl_boot_list[1] = BOOT_DEVICE_SPI;
-}
-#else
 u32 spl_boot_device(void)
 {
 	return sunxi_get_boot_device();
 }
-#endif
 
 __weak void sunxi_sram_init(void)
 {
-- 
2.34.1

[PATCH v2 2/3] mach-sunxi: Add SPL SPI boot for SUNIV

[Jesse Taube]

The SUNIV SoCs come with a sun6i-style SPI controller at the base address
of sun4i SPI controller. The module clock of the SPI controller is
missing which leaves us running directly from the AHB clock, which is
set to 200MHz.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
[Icenowy: Original implementation]
Signed-off-by: Jesse Taube <Mr.Bossman075@gmail.com>
[Jesse: adaptation to Upstream U-Boot]
---
V1 -> V2:
* Change commit description
* Remove redundant conditional statment
* Use else if for pin-function
---
 arch/arm/include/asm/arch-sunxi/gpio.h |  1 +
 arch/arm/mach-sunxi/spl_spi_sunxi.c    | 24 +++++++++++++++++-------
 2 files changed, 18 insertions(+), 7 deletions(-)

diff --git a/arch/arm/include/asm/arch-sunxi/gpio.h b/arch/arm/include/asm/arch-sunxi/gpio.h
index 7f7eb0517c..edd0fbf49f 100644
--- a/arch/arm/include/asm/arch-sunxi/gpio.h
+++ b/arch/arm/include/asm/arch-sunxi/gpio.h
@@ -160,6 +160,7 @@ enum sunxi_gpio_number {
 #define SUNXI_GPC_SDC2		3
 #define SUN6I_GPC_SDC3		4
 #define SUN50I_GPC_SPI0		4
+#define SUNIV_GPC_SPI0		2
 
 #define SUNXI_GPD_LCD0		2
 #define SUNXI_GPD_LVDS0		3
diff --git a/arch/arm/mach-sunxi/spl_spi_sunxi.c b/arch/arm/mach-sunxi/spl_spi_sunxi.c
index 910e805016..734c165e5d 100644
--- a/arch/arm/mach-sunxi/spl_spi_sunxi.c
+++ b/arch/arm/mach-sunxi/spl_spi_sunxi.c
@@ -90,6 +90,7 @@
 
 #define SPI0_CLK_DIV_BY_2           0x1000
 #define SPI0_CLK_DIV_BY_4           0x1001
+#define SPI0_CLK_DIV_BY_32          0x100f
 
 /*****************************************************************************/
 
@@ -132,7 +133,8 @@ static uintptr_t spi0_base_address(void)
 	if (IS_ENABLED(CONFIG_MACH_SUN50I_H6))
 		return 0x05010000;
 
-	if (!is_sun6i_gen_spi())
+	if (!is_sun6i_gen_spi() ||
+	    IS_ENABLED(CONFIG_MACH_SUNIV))
 		return 0x01C05000;
 
 	return 0x01C68000;
@@ -156,11 +158,16 @@ static void spi0_enable_clock(void)
 	if (!IS_ENABLED(CONFIG_MACH_SUN50I_H6))
 		setbits_le32(CCM_AHB_GATING0, (1 << AHB_GATE_OFFSET_SPI0));
 
-	/* Divide by 4 */
-	writel(SPI0_CLK_DIV_BY_4, base + (is_sun6i_gen_spi() ?
-				  SUN6I_SPI0_CCTL : SUN4I_SPI0_CCTL));
-	/* 24MHz from OSC24M */
-	writel((1 << 31), CCM_SPI0_CLK);
+	if (IS_ENABLED(CONFIG_MACH_SUNIV)) {
+		/* Divide by 32, clock source is AHB clock 200MHz */
+		writel(SPI0_CLK_DIV_BY_32, base + SUN6I_SPI0_CCTL);
+	} else {
+		/* Divide by 4 */
+		writel(SPI0_CLK_DIV_BY_4, base + (is_sun6i_gen_spi() ?
+					  SUN6I_SPI0_CCTL : SUN4I_SPI0_CCTL));
+		/* 24MHz from OSC24M */
+		writel((1 << 31), CCM_SPI0_CLK);
+	}
 
 	if (is_sun6i_gen_spi()) {
 		/* Enable SPI in the master mode and do a soft reset */
@@ -191,7 +198,8 @@ static void spi0_disable_clock(void)
 					     SUN4I_CTL_ENABLE);
 
 	/* Disable the SPI0 clock */
-	writel(0, CCM_SPI0_CLK);
+	if (!IS_ENABLED(CONFIG_MACH_SUNIV))
+		writel(0, CCM_SPI0_CLK);
 
 	/* Close the SPI0 gate */
 	if (!IS_ENABLED(CONFIG_MACH_SUN50I_H6))
@@ -212,6 +220,8 @@ static void spi0_init(void)
 	if (IS_ENABLED(CONFIG_MACH_SUN50I) ||
 	    IS_ENABLED(CONFIG_MACH_SUN50I_H6))
 		pin_function = SUN50I_GPC_SPI0;
+	else if (IS_ENABLED(CONFIG_MACH_SUNIV))
+		pin_function = SUNIV_GPC_SPI0;
 
 	spi0_pinmux_setup(pin_function);
 	spi0_enable_clock();
-- 
2.34.1

[PATCH v2 3/3] mach-sunxi: Enable SPI boot for SUNIV and licheepi nano

[Jesse Taube]

Enable SPI boot in SPL on SUNIV architecture and use
it in the licheepi nano that uses the F1C100s.

Signed-off-by: Jesse Taube <Mr.Bossman075@gmail.com>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
---
V1 -> V2:
* Change commit description
---
 arch/arm/mach-sunxi/Kconfig     | 2 +-
 configs/licheepi_nano_defconfig | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-sunxi/Kconfig b/arch/arm/mach-sunxi/Kconfig
index 205fe3c9d3..d1c60d2408 100644
--- a/arch/arm/mach-sunxi/Kconfig
+++ b/arch/arm/mach-sunxi/Kconfig
@@ -1038,7 +1038,7 @@ config SPL_STACK_R_ADDR
 
 config SPL_SPI_SUNXI
 	bool "Support for SPI Flash on Allwinner SoCs in SPL"
-	depends on MACH_SUN4I || MACH_SUN5I || MACH_SUN7I || MACH_SUNXI_H3_H5 || MACH_SUN50I || MACH_SUN8I_R40 || MACH_SUN50I_H6
+	depends on MACH_SUN4I || MACH_SUN5I || MACH_SUN7I || MACH_SUNXI_H3_H5 || MACH_SUN50I || MACH_SUN8I_R40 || MACH_SUN50I_H6 || MACH_SUNIV
 	help
 	  Enable support for SPI Flash. This option allows SPL to read from
 	  sunxi SPI Flash. It uses the same method as the boot ROM, so does
diff --git a/configs/licheepi_nano_defconfig b/configs/licheepi_nano_defconfig
index 2ac0ef4285..9fd1dcc995 100644
--- a/configs/licheepi_nano_defconfig
+++ b/configs/licheepi_nano_defconfig
@@ -9,3 +9,4 @@ CONFIG_MACH_SUNIV=y
 CONFIG_DRAM_CLK=156
 CONFIG_DRAM_ZQ=0
 # CONFIG_VIDEO_SUNXI is not set
+CONFIG_SPL_SPI_SUNXI=y
-- 
2.34.1

Re: [PATCH v2 1/3] mach-sunxi: Add boot device detection for SUNIV/F1C100s

[Jesse Taube]

On 2/11/22 19:32, Jesse Taube wrote:
> In contrast to other Allwinner SoCs the F1C100s BROM does not store a
> boot source indicator in the eGON header in SRAM. This leaves the SPL
> guessing where we were exactly booted from, and for instance trying
> the SD card first, even though we booted from SPI flash.
> 
> By inspecting the BROM code and by experimentation, Samuel found that the
> top of the BROM stack contains unique pointers for each of the boot
> sources, which we can use as a boot source indicator.
> 
> This patch removes the existing board_boot_order bodge and replace it
> with a proper boot source indication function.
> 
> Signed-off-by: Jesse Taube <Mr.Bossman075@gmail.com>
> Suggested-by: Samuel Holland <samuel@sholland.org>
> ---
> V1 -> V2:
> * Bail on NAND
> * Change commit description
> * Change sunxi_get_boot_source to u32
> * Fix FEL boot by next change
> * Move suniv_get_boot_device call into sunxi_get_boot_source
> * Rename suniv_get_boot_device
> * Remove redundant comments
> ---
>   arch/arm/include/asm/arch-sunxi/spl.h | 10 +++++
>   arch/arm/mach-sunxi/board.c           | 57 +++++++++++++--------------
>   2 files changed, 38 insertions(+), 29 deletions(-)
> 
> diff --git a/arch/arm/include/asm/arch-sunxi/spl.h b/arch/arm/include/asm/arch-sunxi/spl.h
> index 58cdf806d9..9a6e8da8e1 100644
> --- a/arch/arm/include/asm/arch-sunxi/spl.h
> +++ b/arch/arm/include/asm/arch-sunxi/spl.h
> @@ -19,6 +19,16 @@
>   #define SUNXI_BOOTED_FROM_MMC0_HIGH	0x10
>   #define SUNXI_BOOTED_FROM_MMC2_HIGH	0x12
>   
> +/*
> + * Values taken from the Bootrom's stack used
> + * to determine where we booted from.
> + */
> +
> +#define SUNIV_BOOTED_FROM_MMC0	0xffff40f8
> +#define SUNIV_BOOTED_FROM_NAND	0xffff4114
> +#define SUNIV_BOOTED_FROM_SPI	0xffff4130
> +#define SUNIV_BOOTED_FROM_MMC1	0xffff4150
> +
>   #define is_boot0_magic(addr)	(memcmp((void *)(addr), BOOT0_MAGIC, 8) == 0)
>   
>   uint32_t sunxi_get_boot_device(void);
> diff --git a/arch/arm/mach-sunxi/board.c b/arch/arm/mach-sunxi/board.c
> index 57078f7a7b..27aee1e445 100644
> --- a/arch/arm/mach-sunxi/board.c
> +++ b/arch/arm/mach-sunxi/board.c
> @@ -191,12 +191,37 @@ SPL_LOAD_IMAGE_METHOD("FEL", 0, BOOT_DEVICE_BOARD, spl_board_load_image);
>   
>   #define SUNXI_INVALID_BOOT_SOURCE	-1
>   
> -static int sunxi_get_boot_source(void)
Didn't like the implicit cast on the return statement.
> +static uint32_t suniv_get_boot_source(void)
> +{
> +	/* Get the last function call from BootRom's stack. */
> +	u32 brom_call = *(u32 *)(fel_stash.sp - 4);
> +
> +	/* translate SUNIV Bootrom stack to standard SUNXI boot sources */
> +	switch (brom_call) {
> +	case SUNIV_BOOTED_FROM_MMC0:
> +		return SUNXI_BOOTED_FROM_MMC0;
> +	case SUNIV_BOOTED_FROM_SPI:
> +		return SUNXI_BOOTED_FROM_SPI;
> +	case SUNIV_BOOTED_FROM_MMC1:
> +		return SUNXI_BOOTED_FROM_MMC2;
> +	/* SPI nand is invalid try to boot from FEL*/
> +	case SUNIV_BOOTED_FROM_NAND:
> +		return SUNXI_INVALID_BOOT_SOURCE;
> +	}
> +	/* If we get here something went wrong try to boot from FEL.*/
> +	printf("Unknown boot source from BROM: 0x%x\n", brom_call);
> +	return SUNXI_INVALID_BOOT_SOURCE;
This just trys to boot from FEL doesn't hang.
> +}
> +
> +static uint32_t sunxi_get_boot_source(void)
>   {
>   	if (!is_boot0_magic(SPL_ADDR + 4)) /* eGON.BT0 */
>   		return SUNXI_INVALID_BOOT_SOURCE;
This will return when booting from FEL.
>   
> -	return readb(SPL_ADDR + 0x28);
> +	if (IS_ENABLED(CONFIG_MACH_SUNIV))
> +		return suniv_get_boot_source();
> +	else
> +		return readb(SPL_ADDR + 0x28);
>   }
>   
>   /* The sunxi internal brom will try to loader external bootloader
> @@ -204,7 +229,7 @@ static int sunxi_get_boot_source(void)
>    */
>   uint32_t sunxi_get_boot_device(void)
>   {
> -	int boot_source = sunxi_get_boot_source();
> +	uint32_t boot_source = sunxi_get_boot_source();
>   
>   	/*
>   	 * When booting from the SD card or NAND memory, the "eGON.BT0"
> @@ -276,36 +301,10 @@ unsigned long spl_mmc_get_uboot_raw_sector(struct mmc *mmc,
>   	return sector;
>   }
>   
> -#ifdef CONFIG_MACH_SUNIV
> -/*
> - * The suniv BROM does not pass the boot media type to SPL, so we try with the
> - * boot sequence in BROM: mmc0->spinor->fail.
> - * TODO: This has the slight chance of being wrong (invalid SPL signature,
> - * but valid U-Boot legacy image on the SD card), but this should be rare.
> - * It looks like we can deduce from some BROM state upon entering the SPL
> - * (registers, SP, or stack itself) where the BROM was coming from and use
> - * that here.
> - */
> -void board_boot_order(u32 *spl_boot_list)
> -{
> -	/*
> -	 * See the comments above in sunxi_get_boot_device() for information
> -	 * about FEL boot.
> -	 */
> -	if (!is_boot0_magic(SPL_ADDR + 4)) {
> -		spl_boot_list[0] = BOOT_DEVICE_BOARD;
> -		return;
> -	}
> -
> -	spl_boot_list[0] = BOOT_DEVICE_MMC1;
> -	spl_boot_list[1] = BOOT_DEVICE_SPI;
> -}
> -#else
>   u32 spl_boot_device(void)
>   {
>   	return sunxi_get_boot_device();
>   }
> -#endif
>   
>   __weak void sunxi_sram_init(void)
>   {

Re: [PATCH v2 0/3] Add SPI boot to SPL on SUNIV/F1C100s

[Jesse Taube]

Hey just checking if you know about this set.
> This patch adds the ability to detect the BROM's boot source,
> as well as the ability to boot from SPI.
> 
> Jesse Taube (3):
>    mach-sunxi: Add boot device detection for SUNIV/F1C100s
>    mach-sunxi: Add SPL SPI boot for SUNIV
>    mach-sunxi: Enable SPI boot for SUNIV and licheepi nano
> 
>   arch/arm/include/asm/arch-sunxi/gpio.h |  1 +
>   arch/arm/include/asm/arch-sunxi/spl.h  | 10 +++++
>   arch/arm/mach-sunxi/Kconfig            |  2 +-
>   arch/arm/mach-sunxi/board.c            | 57 +++++++++++++-------------
>   arch/arm/mach-sunxi/spl_spi_sunxi.c    | 24 +++++++----
>   configs/licheepi_nano_defconfig        |  1 +
>   6 files changed, 58 insertions(+), 37 deletions(-)
> 

Re: [PATCH v2 0/3] Add SPI boot to SPL on SUNIV/F1C100s

[Andre Przywara]

On Mon, 28 Feb 2022 23:42:13 -0500
Jesse Taube <mr.bossman075@gmail.com> wrote:

Hi,

> Hey just checking if you know about this set.

Yeah, I saw that, and am planning on taking it ASAP, so still this
release. However I wanted to have this tested, which is now easier since I
got my LicheePi Nano on Friday. So SPI boot seems to work, but I needed to
fix FEL boot in mainline (see the other patch).

I am not convinced with the uint32_t part, though. I think "int" is fine,
because it's either -1 or the uint8_t returned by readb(), which fits both
nicely and correctly into an "int".

I will do some more testing and then see what other patches I can pick up
(Jernej's PRCM ones, for instance).

Cheers,
Andre

> > This patch adds the ability to detect the BROM's boot source,
> > as well as the ability to boot from SPI.
> > 
> > Jesse Taube (3):
> >    mach-sunxi: Add boot device detection for SUNIV/F1C100s
> >    mach-sunxi: Add SPL SPI boot for SUNIV
> >    mach-sunxi: Enable SPI boot for SUNIV and licheepi nano
> > 
> >   arch/arm/include/asm/arch-sunxi/gpio.h |  1 +
> >   arch/arm/include/asm/arch-sunxi/spl.h  | 10 +++++
> >   arch/arm/mach-sunxi/Kconfig            |  2 +-
> >   arch/arm/mach-sunxi/board.c            | 57 +++++++++++++-------------
> >   arch/arm/mach-sunxi/spl_spi_sunxi.c    | 24 +++++++----
> >   configs/licheepi_nano_defconfig        |  1 +
> >   6 files changed, 58 insertions(+), 37 deletions(-)
> >   

Re: [PATCH v2 0/3] Add SPI boot to SPL on SUNIV/F1C100s

[Andre Przywara]

On Mon, 28 Feb 2022 23:42:13 -0500
Jesse Taube <mr.bossman075@gmail.com> wrote:

Hi,

> Hey just checking if you know about this set.
> > This patch adds the ability to detect the BROM's boot source,
> > as well as the ability to boot from SPI.

So I fixed two more things (FEL booting and reset), and massaged the
first patch a bit (fixing arm64 compilation, and protecting U-Boot
proper operation).
I pushed the result to sunxi/master[1], and plan to send a PR as soon
as I can do some more testing: the Nano boots fine, via FEL, MMC, and
SPI, but I need to check other boards as well.

Please test this branch and scream if you are not happy!

Cheers,
Andre

[1] https://source.denx.de/u-boot/custodians/u-boot-sunxi/-/commits/master/

> > 
> > Jesse Taube (3):
> >    mach-sunxi: Add boot device detection for SUNIV/F1C100s
> >    mach-sunxi: Add SPL SPI boot for SUNIV
> >    mach-sunxi: Enable SPI boot for SUNIV and licheepi nano
> > 
> >   arch/arm/include/asm/arch-sunxi/gpio.h |  1 +
> >   arch/arm/include/asm/arch-sunxi/spl.h  | 10 +++++
> >   arch/arm/mach-sunxi/Kconfig            |  2 +-
> >   arch/arm/mach-sunxi/board.c            | 57 +++++++++++++-------------
> >   arch/arm/mach-sunxi/spl_spi_sunxi.c    | 24 +++++++----
> >   configs/licheepi_nano_defconfig        |  1 +
> >   6 files changed, 58 insertions(+), 37 deletions(-)
> >