The pattern for i.MX boards starting in external NAND boot mode is always
the same:
- Check if we are running in NFC address space, if not call
board_init_lowlevel_return()
- copy binary to link address
- execute relocated binary
- call imx_nand_load_image()
Add a common function for this to make the board code easier.
Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
arch/arm/mach-imx/external-nand-boot.c | 75 +++++++++++++++++++++++++++++
arch/arm/mach-imx/include/mach/imx-nand.h | 5 ++
2 files changed, 80 insertions(+)
diff --git a/arch/arm/mach-imx/external-nand-boot.c b/arch/arm/mach-imx/external-nand-boot.c
index 2e9e475..39ffb94 100644
--- a/arch/arm/mach-imx/external-nand-boot.c
+++ b/arch/arm/mach-imx/external-nand-boot.c
@@ -15,6 +15,8 @@
#include <init.h>
#include <io.h>
#include <linux/mtd/nand.h>
+#include <asm/sections.h>
+#include <asm/barebox-arm.h>
#include <mach/imx-nand.h>
#include <mach/generic.h>
#include <mach/imx21-regs.h>
@@ -256,6 +258,79 @@ void __bare_init imx_nand_load_image(void *dest, int size)
}
}
+/*
+ * We are now running at the address we are linked at. Now load the image from
+ * NAND to SDRAM and continue booting.
+ */
+static void __bare_init __naked insdram(void)
+{
+ imx_nand_load_image((void *)_text, barebox_image_size);
+
+ board_init_lowlevel_return();
+}
+
+/*
+ * Load and start barebox from NAND. This function also checks if we are really
+ * running inside the NFC address space. If not, barebox is started from the
+ * currently running address without loading anything from NAND.
+ */
+void __bare_init __noreturn imx_barebox_boot_nand_external(unsigned long nfc_base)
+{
+ u32 r;
+ u32 *src, *trg;
+ int i;
+
+ /* skip NAND boot if not running from NFC space */
+ r = get_pc();
+ if (r < nfc_base || r > nfc_base + 0x800)
+ board_init_lowlevel_return();
+
+ src = (unsigned int *)nfc_base;
+ trg = (unsigned int *)_text;
+
+ /* Move ourselves out of NFC SRAM */
+ for (i = 0; i < 0x800 / sizeof(int); i++)
+ *trg++ = *src++;
+
+ /* Jump to SDRAM */
+ r = (unsigned int)&insdram;
+ __asm__ __volatile__("mov pc, %0" : : "r"(r));
+
+ /* not reached */
+ while (1);
+}
+
+/*
+ * SoC specific entries for booting in external NAND mode. To be called from
+ * the board specific entry code. This is safe to call even if not booting from
+ * NAND. In this case the booting is continued without loading an image from
+ * NAND. This function needs a stack to be set up.
+ */
+void __bare_init __noreturn imx21_barebox_boot_nand_external(void)
+{
+ imx_barebox_boot_nand_external(MX21_NFC_BASE_ADDR);
+}
+
+void __bare_init __noreturn imx25_barebox_boot_nand_external(void)
+{
+ imx_barebox_boot_nand_external(MX25_NFC_BASE_ADDR);
+}
+
+void __bare_init __noreturn imx27_barebox_boot_nand_external(void)
+{
+ imx_barebox_boot_nand_external(MX27_NFC_BASE_ADDR);
+}
+
+void __bare_init __noreturn imx31_barebox_boot_nand_external(void)
+{
+ imx_barebox_boot_nand_external(MX31_NFC_BASE_ADDR);
+}
+
+void __bare_init __noreturn imx35_barebox_boot_nand_external(void)
+{
+ imx_barebox_boot_nand_external(MX35_NFC_BASE_ADDR);
+}
+
#define CONFIG_NAND_IMX_BOOT_DEBUG
#ifdef CONFIG_NAND_IMX_BOOT_DEBUG
#include <command.h>
diff --git a/arch/arm/mach-imx/include/mach/imx-nand.h b/arch/arm/mach-imx/include/mach/imx-nand.h
index fb753cf..a1f209e 100644
--- a/arch/arm/mach-imx/include/mach/imx-nand.h
+++ b/arch/arm/mach-imx/include/mach/imx-nand.h
@@ -4,6 +4,11 @@
#include <linux/mtd/mtd.h>
void imx_nand_load_image(void *dest, int size);
+void imx21_barebox_boot_nand_external(void);
+void imx25_barebox_boot_nand_external(void);
+void imx27_barebox_boot_nand_external(void);
+void imx31_barebox_boot_nand_external(void);
+void imx35_barebox_boot_nand_external(void);
void imx_nand_set_layout(int writesize, int datawidth);
struct imx_nand_platform_data {
--
1.7.10.4
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