SPL: Add XIP booting support

Enable support for XIP (execute in place) of U-Boot or kernel image. There is
no need to copy image from flash to ram if flash supports execute in place.

Signed-off-by: Vikas Manocha <vikas.manocha@st.com>
Reviewed-by: Alexandru Gagniuc <alex.g@adaptrum.com>

diff --git a/arch/arm/include/asm/spl.h b/arch/arm/include/asm/spl.h
index 5d7f7e6..0e67470 100644 (file)
--- a/arch/arm/include/asm/spl.h
+++ b/arch/arm/include/asm/spl.h
@@ -29,6 +29,7 @@ enum {
        BOOT_DEVICE_I2C,
        BOOT_DEVICE_BOARD,
        BOOT_DEVICE_DFU,
+       BOOT_DEVICE_XIP,
        BOOT_DEVICE_NONE
 };
 #endif

diff --git a/common/spl/Kconfig b/common/spl/Kconfig
index 732690c..4de8139 100644 (file)
--- a/common/spl/Kconfig
+++ b/common/spl/Kconfig
@@ -437,6 +437,15 @@ config SPL_NOR_SUPPORT
          a memory-mapped device makes it very easy to access. Loading from
          NOR is typically achieved with just a memcpy().
 
+config SPL_XIP_SUPPORT
+       bool "Support XIP"
+       depends on SPL
+       help
+         Enable support for execute in place of U-Boot or kernel image. There
+         is no need to copy image from flash to ram if flash supports execute
+         in place. Its very useful in systems having enough flash but not
+         enough ram to load the image.
+
 config SPL_ONENAND_SUPPORT
        bool "Support OneNAND flash"
        help

diff --git a/common/spl/Makefile b/common/spl/Makefile
index b3b34d6..47a64dd 100644 (file)
--- a/common/spl/Makefile
+++ b/common/spl/Makefile
@@ -12,6 +12,7 @@ ifdef CONFIG_SPL_BUILD
 obj-$(CONFIG_SPL_FRAMEWORK) += spl.o
 obj-$(CONFIG_SPL_LOAD_FIT) += spl_fit.o
 obj-$(CONFIG_SPL_NOR_SUPPORT) += spl_nor.o
+obj-$(CONFIG_SPL_XIP_SUPPORT) += spl_xip.o
 obj-$(CONFIG_SPL_YMODEM_SUPPORT) += spl_ymodem.o
 ifndef CONFIG_SPL_UBI
 obj-$(CONFIG_SPL_NAND_SUPPORT) += spl_nand.o

diff --git a/common/spl/spl_xip.c b/common/spl/spl_xip.c
new file mode 100644 (file)
index 0000000..18c7d11
--- /dev/null
+++ b/common/spl/spl_xip.c
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2017 Vikas Manocha <vikas.manocha@st.com>
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+#include <common.h>
+#include <spl.h>
+
+static int spl_xip(struct spl_image_info *spl_image,
+                  struct spl_boot_device *bootdev)
+{
+#ifdef CONFIG_SPL_OS_BOOT
+       if (!spl_start_uboot()) {
+               spl_image->arg = (void *)CONFIG_SYS_FDT_BASE;
+               spl_image->name = "Linux";
+               spl_image->os = IH_OS_LINUX;
+               spl_image->load_addr = CONFIG_SYS_LOAD_ADDR;
+               spl_image->entry_point = CONFIG_SYS_LOAD_ADDR;
+               debug("spl: payload xipImage, load addr: 0x%lx\n",
+                     spl_image->load_addr);
+               return 0;
+       }
+#endif
+       return(spl_parse_image_header(spl_image, (const struct image_header *)
+              CONFIG_SYS_UBOOT_BASE));
+}
+SPL_LOAD_IMAGE_METHOD("XIP", 0, BOOT_DEVICE_XIP, spl_xip);